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1.
Summary. When sequential single-node shoot segments (third to fifteenth node, counting from the apex) of the perennial grass weed Paspalum distichum L. were buried in soil, new shoot growth was significantly correlated with initial segment length. Growth from the youngest segment (third), which was about 2 cm long, was only half as great as that from segments 8 to 15, which were initially 2–3·5 times longer. When 14-node shoot segments were buried in soil, the apical bud exerted a dominating influence on shoot emergence and new shoot growth of axillary buds. The degree of suppression increased gradually up to node 8 and then decreased as the distance from the apex increased. A similar result was obtained in these shoot segments following decapitation. However, the degrees and patterns of apical and bud dominance varied in shoots collected during different seasons and also in shoots with different node numbers, node position, cutting and chilling treatments. A possible role of apical and bud dominance in P. distichum in keeping aerial shocks in reserve under adverse conditions, thus providing a survival mechanism for this weed, is discussed.  相似文献   

2.
The rate of sprouting, rooting and early growth of both single-node stem and rhizome segments of Paspalum distichum L. increased as incubation temperatures increase to about 30°C and then declined at 40°C. There was little growth at 10°C. Single-node shoots remained viable at cooler temperatures after 1 days’incubation at 45°C, and 35% remained viable after 2 days’incubation at 45°C. Both shoot and rhizome segments sprouted and rooted at alternating temperatures of 45°C/28°C and 45°C/22°C. Generally sprouting and rooting of shoot segments were faster than in rhizome segments, but the response to temperature was similar for both sprouting and rooting of single-node shoot and rhizome segments. Single-node shoot segments sprouted faster in 16-h day lengths than in the dark. Rooting was better in the dark at 10°C, unaffected by light at 22 and 28°C, and faster in the light at 35 and 40°C. Sprouting, rooting and early growth were enhanced by gibberellin A3, kinetin and indole-3-acetic acid. Shoots collected at different seasons differed in their sprouting and rooting responses at various incubation temperatures. These patterns varying in response to seasonal temperature fluctuations may provide a survival mechanism for P. distichum.  相似文献   

3.
The presence of the leaf blade for 5 days or longer on isolated single-node stem segments of Paspalum distichum with an adequate supply of nutrients, water and light, produced better axillary bud growth than was observed on those segments without the leaf blade. Presence or absence of the leaf blade had no effect on segments in distilled water. Segments in Hoagland's solution of any strength exhibited significantly more growth than those in distilled water. In one-half or full-strength Hoagland's solution, segments generally showed signifi cantly more growth than segments in lower strength solutions. Segments subjected to flooding, daily watering, submergence or hydro-ponic treatments exhibited significantly more growth than the segments that were watered every 3 days. Segments with the leaf blade retained, and those exposed to constant light, showed significantly better growth than segments without an attached leaf blade, or without light. It is concluded that the interactions between leaf blade, water, nutrients and light, which favoured photosynthesis and reduced transpiration, increased axillary bud growth. This interaction may provide a survival mechanism for isolated stems of P. distichum, assisting its rapid spread in wetlands.  相似文献   

4.
Summary. The allelopathic effect of Chenopodium album L. (fat-hen) and Senecio vulgaris L. (groundsel) on tomato ( Lycopersicon esculentum Mill cv. Ailsa Craig) plants was investigated under glasshouse conditions. A new technology was used to separate competitive from allelopathic effects. These experiments suggested that C. album had an effect on tomato through allelopathy. C. album leach-ates significantly reduced shoot fresh and dry weights and the accumulation of N, P, K, Ca and Mg of tomato shoots. No effect was found on the quantities of these elements in tomato roots. Leachate of five plants of C. album per pot was sufficient to reduce tomato growth. Addition of 10 or 20 g kg−1 of C. album dried shoots to the soil mixture significantly decreased the fresh and dry weights of tomato plants. S. vulgaris leachates did not show significant effects on the growth or nutrient accumulation of tomato plants.  相似文献   

5.
Water extracts obtained from the roots, shoots, and fruits of mature wild onion ( Asphodelus tenuifolius ) plants and soil taken from an A. tenuifolius field were used to determine their allelopathic effects on the germination and seedling growth of chickpea ( Cicer arietinum ) in the laboratory. The roots, shoots, and fruits of A. tenuifolius were soaked individually in water in a ratio of 1:20 (w/v) for 24 h to prepare the extracts. Distilled water was used as the control. The germinated seeds were taken out from the Petri dishes and counted every day for 12 days. The seeds of chickpea were also sown in sand and in each of the controlled, normal soil and the soil taken from the A. tenuifolius -infested field in Petri dishes to record the length and weight of the roots and shoots 18 days after sowing. The mean germination time reached the maximum amount for the stem and fruit extracts. The fruit extract caused the most reduction in the germination index and the germination percentage of chickpea. The different wild onion organ extracts significantly reduced the root and shoot length and biomass of the chickpea seedlings compared with the distilled water. The fruit extract of wild onion proved to be the most detrimental to the root length, shoot length, and dry weight of the chickpea seedlings. The soil beneath the A. tenuifolius plants significantly reduced the emergence, root length, shoot length, shoot dry weight, and seedling dry weight but increased the root dry weight of the chickpea seedlings. It is suggested that A. tenuifolius releases phytotoxic compound(s).  相似文献   

6.
Controlling established horsenettle plants is achieved by suppressing shoot emergence from root systems. The seasonal pattern of shoot emergence and its possible endogenous control in horsenettle ( Solanum carolinense L.) were investigated. The shoot emergence period in an undisturbed population was limited to a seven-week period from mid-April, and a little longer in tilled conditions. Detached roots showed very high shoot-sprouting ability under 15–30°C throughout the year. In shoot clipping experiments, new shoots sprouted only from the stem and not from the root when attached to shoots, whether above-ground or underground. On the contrary, new shoots sprouted from the roots when all parts of the shoots were clipped off. From these results, the limited shoot emergence period in horsenettle is thought to be initiated by temperatures necessary for sprouting and is ended by a growth correlation effect between early emerged and matured shoots.  相似文献   

7.
Centaurea solstitialis (yellow starthistle) has invaded rangelands and natural areas in the western USA. There is evidence that mowing is a more effective method of reducing growth and seed production, compared with the well‐established and distributed bioagents. To test this hypothesis we measured C. solstitialis's growth and reproduction following two treatments (late spring and early summer bud/capitula destruction and shoot mowing) and measured C. solstitialis's growth and reproduction. We measured changes in soil moisture content to test the hypothesis that these manipulations differentially affect water usage by the invasive plant. Mowing produced shorter plants that weighed less. Bud damaged plants were not statistically different from untreated controls. The number of developed capitula was reduced 67% by mowing but was unaffected by bud damage. Mowed plants redistributed resources from root to flower production. Both treatments reduced mean capitulum diameter. This resulted in reductions of 76% and 21% in estimated seed number for mowed and bud damaged plants respectively. Root abundance decreased and root life‐span was reduced by both treatments. Soil moisture depletion was greatest from mid‐May to mid‐July (from 21% to 9%) and occurred after maximum root abundance. Mowing resulted in a delay in soil moisture depletion compared with the bud damaged plants or the untreated controls. Bud/capitula damage did not affect C. solstitialis's requirement for soil water. Overall, this study supported the hypothesis that mowing reduced C. solstitialis growth and reproduction more than bud damage alone. This information will aid managers in selecting a strategy for managing C. solstitialis in a particular habitat.  相似文献   

8.
ABSTRACT The first characterization of alterations in whole-plant photosynthetic rate and carbon assimilation of bell peppers associated with infection by Pythium aphanidermatum is described. Relationships of root disease caused by P. aphanidermatum to whole-plant net carbon exchange rate (NCER), total carbon accumulation, dark respiration rates, water loss, and destructive growth parameters were quantified in vegetative, hydroponically grown pepper plants (Capsicum annuum 'Cubico'). Inoculated plants displayed lower whole-plant NCER. This translated into a loss of 28% in cumulative C gain during 7 days after inoculation and occurred before visible shoot symptoms developed. Leaf area and dry weight of shoots and roots were significantly decreased and the shoot/root ratio was higher in inoculated plants than in noninoculated plants. We propose that reduced NCER in inoculated plants was mainly due to restricted development of leaf area, because no differences in NCER and evapotranspiration were observed between control and inoculated plants when expressed based on leaf area and root dry mass, respectively. These findings indicate that Pythium infection did not affect the photosynthetic apparatus directly and that the reductions in photosynthesis and growth were not caused by inefficient water transport by diseased roots. These results enlarge on the understanding of physiological responses of host plants to early stages of root disease.  相似文献   

9.
The present study was undertaken from May 1996 to October 1997 in the glasshouse of the University of the Ryukyus, Okinawa, Japan to investigate standing water (12 cm deep) and shoot removal plus standing water regimes on morphological changes, growth, regrowth and biomass production of torpedograss ( Panicum repens L.). The stem internode was longer in standing-water-treated plants than that in untreated plants. The root-crown was developed from the submerged stem-node. Spike-like tillers and sheath-like leaf blades were observed in water-treated plants. Higher shoot biomass and lower rhizome biomass were obtained in standing-water-treated plants than that in untreated plants. Standing-water-treated plants attained higher total biomass than untreated plants. Standing-water stress was the factor that inhibited regrowth of torpedograss when the above-ground shoot was removed. Rhizomes without shoots of 6-month-old torpedograss did not survive in standing water for more than 6 months. The results indicate that torpedograss can survive in standing water if the shoots remain above the water surface. Shoot removal is one effective way to control torpedograss regrowth in standing water. The results of this study may be dependent on season, day length, water temperature, water pH, water depth and salt concentration in water.  相似文献   

10.
Chang CJ 《Phytopathology》1998,88(12):1347-1350
ABSTRACT Using Murashige and Skoog (MS) as a basal medium, the effects of varying levels and combinations of plant growth regulators required for shoot tip and root proliferation in healthy and aster yellows phytoplasma (AYP)- and Spiroplasma citri-infected periwinkle (Catharanthus roseus) shoots were studied. Number of shoots and fresh and dry mass of healthy and AYP-infected shoots increased when benzyladenine (BA) concentrations were increased from 0.5 to 4 mg/liter. The maximum number of shoots for both healthy and AYP-infected plants was obtained when grown in MS medium supplemented with BA at 4 mg/liter and indole-3-acetic acid (IAA) at 0.5 mg/liter. S. citri-infected shoots proliferated the most when grown in MS medium containing BA at 2 mg/liter and IAA at 0.5 mg/liter. The best medium for root production in healthy periwinkle shoots contained alpha-naphthaleneacetic acid (NAA) at 0.5 mg/liter, whereas the best medium for AYP-infected shoots contained indole-3-butyric acid (IBA) at 2.5 mg/liter, both in combination with kinetin at 0.1 mg/liter. S. citri-infected shoots had the best root growth when grown in medium supplemented with IBA at 5.0 mg/liter and kinetin at 0.1 mg/liter. The concentration of cytokinin and auxin needed for maximum shoot proliferation differed between AYP- and S. citri-infected shoot tips, strongly indicating that the two mollicutes may cause different changes in endogenous cytokinin and auxin levels. The concentrations of NAA and IBA needed for root growth of S. citri-infected shoots were two- to fivefold higher than the concentrations needed for healthy and AYP-infected shoots, clearly demonstrating that S. citri infection caused a shortage of auxins that resulted in retardation of secondary root growth. Chlorophyll content was markedly reduced in periwinkles infected with AYP or S. citri compared with chlorophyll in healthy periwinkles. AYP caused a decrease in carotenoid in leaves 6 weeks after graft-inoculation, but carotenoid content was unchanged in S. citri-infected leaves throughout the test period. Anthocyanin content in periwinkles infected with AYP decreased significantly by 4 weeks postinoculation, whereas anthocyanin content in periwinkles infected with S. citri increased. Anthocyanin content in leaf tissues, however, was reduced as a result of AYP and S. citri infection. Pigment changes induced by AYP and S. citri, whether similar or different compared with those of healthy periwinkle shoots, provide important information for interpreting pathogenesis when linked with plant growth regulators.  相似文献   

11.
Brandsæter LO, Fogelfors H, Fykse H, Graglia E, Jensen RK, Melander B, Salonen J & Vanhala P (2010). Seasonal restrictions of bud growth on roots of Cirsium arvense and Sonchus arvensis and rhizomes of Elymus repens. Weed Research 50 , 102–109.

Summary

The success of weed management aimed at depleting the regenerative structures of perennial weeds depends largely on the sprouting activity of rhizome and root buds. Seasonal variation in sprouting of these buds on Cirsium arvense, Sonchus arvensis and Elymus repens was studied for plants collected from Denmark, Finland, Norway and Sweden. At 2‐week intervals from July to October, 5‐cm fragments of roots or rhizomes were cut from plants grown in buckets and planted into soil in pots, half of which were placed immediately into growth chambers at 18°C for 4 weeks. The other half of the pots were initially placed in a dark room at 2°C for 4 weeks before being transferred to the same growth chamber, also for 4 weeks. During the growth chamber period, the numbers of emerged shoots in each pot were counted weekly. The sprouting activity of C. arvense and E. repens was relatively uniform during this period and bud dormancy was not apparent. In all ecotypes of S. arvensis, innate bud dormancy developed during the latter part of the growing season. For all three species, differences in sprouting readiness were found among ecotypes. The results imply that C. arvense and E. repens are more likely to be controlled by mechanical measures in autumn than S. arvensis.  相似文献   

12.
The allelopathic effect of Amaranthus retroflexus L., Amaranthus blitoides S. Wats, and Amaranthus gracilis Desf. on wheat Triticum durum L. was investigated under laboratory, glasshouse and field conditions. Laboratory experiments showed that fresh shoot or root extract of the three weed species reduced germination, coleoptile length, root length and root dry weight of wheat seedlings. The inhibitory effects were rate dependent, with low concentrations of shoot extract promoting shoot growth of wheat. Fresh plant extracts were more phytotoxic than dried plant extracts and shoot extracts had higher detrimental effects than root extracts. In pot experiments, dried shoot extract of A. gracilis increased shoot and root dry weights of wheat seedlings. For A retroflexus and A. blitoides the extracts of these and dried shoots (8 g kg?1), which had been added to soil mixtures significantly reduced ger-mination and growth of wheat seedlings. Addition of up to 16 g kg?1 of A. gracilis residues promoted shoot growth of wheat and had no significant harmful effect on root growth. Roots appeared more sensitive to allelopathic effect than shoots. Under field conditions, incorporation of A. retroflexus or A. blitoides residues in the soil reduced height, grain and straw yield of wheat, whereas A. gracilis residues stimulated plant height and increased yield.  相似文献   

13.
Glyphosate ? ? Mention of irademark or proprietary product does not constitute a gtiarantee or warranty oC the product by the U.S. Department of Agriculture and does nut imply its approval to the exclusion of other products thai may also be suitable.
was sprayed at 0009–1·12 kg a.i. ha?1 on the foliage of large potted glasshouse-grown Canada thistle [Cirsium arvense (L.) Scop.], which had extensive, well-developed roots. Increasing the glyphosate rate progressively reduced the total number of visible adventitious root buds plus emerged secondary shoots per plant proportionately more than root biomass, 10 days after treatment. Cortical tissue of thickened propagative roots became soft, water-soaked, darkened, and some regions decomposed, exposing strands of vascular tissue. Lateral roots completely decomposed. When thickened roots were segmented to stimulate secondary shoot emergence from root buds 10 days after foliar treatment, Fewer secondary shoots emerged than expected from the number of visible adventitious root buds present on both control and herbicide-treated plants. Increasing the rate of glyphosate also reduced the regrowth potential of root buds proportionately more than root biomass. Regrowth potential was measured as the number of emerged secondary shoots 35 days after segmenting unearthed roots from plants that had been sprayed 10 days earlier. When foliar-applied at 0·28 kg ha?1, glyphosate decreased the regrowth potential of root buds to zero in 2 and 3 days, as measured by secondary shoot dry weight and number, respectively, even though root fresh weight was unchanged 3 days after foliar treatment. These dose-response and time-course experiments demonstrate that glyphosate did not reduce root biomass as much as it decreased root bud numbers and secondary shoot regrowth potential from root buds.  相似文献   

14.
以夏玉米(zea may L. cv.)为试验材料,采用防雨棚下桶栽土培方法,进行调亏灌溉(Regulated deficit irrigation,RDI)对根、冠生长的影响研究,旨在寻求适宜的水分调亏阶段和调节亏水度,为建立节水高产、优质高效作物RDI模式提供技术参数。试验采用二因素随机区组设计,设置4个水分调亏阶段:三叶～拔节(Ⅰ),拔节～抽穗(Ⅱ),抽穗～灌浆(Ⅲ),灌浆～成熟(Ⅳ);每个调亏阶段设置3个水分调亏度:轻度调亏(L)、中度调亏(M)和重度调亏(S),土壤相对含水率分别为60%～65%FC(Field capacity)、50%～55%FC和40%～45%FC;设全生育期保持适宜土壤水分(75%～80%FC)作为对照(CK)。分别在水分调亏期间和复水后测定各处理根系参数和地上干物质质量。结果表明,玉米生长中、后期水分调亏具有促进根系发育和减缓根系衰亡的"双重效应",反映出玉米根系在生育后期比生育前期对水分适应能力强的特性。玉米根冠比(R/S)受水分影响最大的阶段是三叶-拔节期,受水分影响最小的阶段是灌浆期;拔节-抽穗期水分调亏期间能显著增大R/S,复水后分配到冠层与根系的物质比较平衡,维持较为适宜的R/S,表明此阶段为通过RDI调控玉米R/S的适宜阶段。玉米三叶-拔节期水分调亏改善了穗部性状,表明在作物营养生长阶段的适度水分调亏有利于作物生殖生长。RDI可以有效调控根/冠生长关系,提高经济产量。  相似文献   

15.
Increased infestation of aggressive creeping perennial weeds is a significant problem in urban vegetation management programs. These weeds produce vigorous biomass and extensive underground networks of either rhizomes or creeping roots that easily regrow from numerous buds. Foliar application of proper systemic herbicides has been a most effective way to suppress regrowth from underground creeping organs; however, killing the mature plants has disadvantages from aesthetic, economic, and ecological viewpoints. Therefore, we intended to test the possibility of soil‐injection of soil‐active herbicides for effective control of the perennial weeds which develop underground network systems. A pot experiment using combinations of seven species (seven rhizomatous and two having creeping roots) and five chemicals (four herbicides and a plant growth regulator) was conducted to assess whether and how chemicals diffused in soil affect the sprout and growth of buds on creeping organs. All the tested herbicides completely inhibited bud sprouting in one and more species when applied at median or high rates, while most of the flurprimidol‐applied segments sprouted but shoot elongation was significantly reduced. Characteristics of each herbicide were also reflected in the selectivity and features of new outgrowth. The results indicated that chemicals existing in soil were undoubtedly absorbed and affected bud activities. It is concluded that soil injection that delivers the probable soil‐active chemicals to subterranean creeping systems could be a promising technology for controlling noxious creeping perennials.  相似文献   

16.
The fungicides triadimefon and triadimenol markedly reduced growth of coleoptiles, primary leaves, and roots of barley seedlings when grown for 7 days in petri dishes in the dark. The addition of gibberellins (A1, A3, A4, A7, A9) alleviated growth retardation of primary leaves and coleoptiles induced by the fungicides. While fungicide-induced growth retardation of the shoots was partly relieved by kinetin, IAA did not show an alleviating activity. Triadimefon and triadimenol also substantially retarded the elongation of shoots of tomato and cotton plants and simultaneous application of GA3 nullified the retardation. The fungicides only slightly interfered with both α-amylase production of intact germinating barley seed and the GA3-induced α-amylase synthesis in barley endosperm. On the other hand, extracts of triadimefon- and triadimenol-treated shoot tissue of 10- to 12-day-old barley plants contained substantially lower gibberellin-like activity than control shoots. Both compounds also interfered in sterol metabolism of shoots of barley seedlings when compared to control plants, treatment resulted in lower amounts and altered proportions of C-4,4-desmethyl sterols. While both fungicides inhibited synthesis of C-4,4-desmethyl sterol fraction, sterols possessing C-4 and C-14-methyl groups were accumulated. It is assumed that triadimefon and triadimenol interfere in gibberellin and sterol biosynthesis in barley seedlings by inhibiting oxidative demethylation reactions.  相似文献   

17.
进行分层盆栽试验,模拟田间土壤剖面上下层水分不均匀分布条件,研究表层土壤施锌对玉米植株吸收Ca、Fe、Mn和Cu养分的影响。结果表明:上层土壤干旱抑制了苗期玉米植株生长,降低了地上部Ca、Fe、Mn分配比例。上层土壤干旱情况下,增加下层土壤水分供应,并没有提高植株生长和养分元素的吸收量。施锌明显促进了玉米地上部生长,在土壤水分充足时,施锌对植株生长效果更明显。不论土壤水分状况如何,施锌显著降低了植株中Ca、Fe、Mn、Cu浓度,对植株吸收积累Fe有拮抗作用;上层土壤干旱条件下,施锌还降低了地上部和整株中Mn以及根部Cu的积累量。施锌对植株体内Ca、Fe、Mn、Cu向上运输没有显著性影响。研究表明土壤表层干旱条件下,即使增加土壤水分,尚不能提高玉米植株生长和对Ca、Fe、Mn、Cu等养分的吸收利用。施用锌肥可以提高作物对土壤水分利用,但要注意对作物吸收Fe与Mn的拮抗作用,适当配合铁锰等养分供应。  相似文献   

18.
This study aims at quantifying the effects of defoliation on seed production and germination in Buddleja davidii , and determining the potential for reducing the invasive success of the species. The effects of defoliation on seed production and germination at the flower spike and plant levels were investigated for control plants and plants that were defoliated by 66% at monthly intervals from mid-summer (January) to mid-autumn (April). Seed samples for germination were collected in late autumn (May). Defoliation reduced flower spike number per shoot, seed number per flower spike and average seed mass by 9%, 22% and 13% and 30%, 33% and 17% on main and side shoots, respectively. In contrast, emergent leaf area per shoot in the defoliated plants exceeded that for the control plants by 89%. The ratio of total seed mass per plant/emergent leaf area per shoot was significantly lower in the defoliated compared with the control plants by 50%. Defoliation did not affect the timing or rate of seed germination. Defoliation of B. davidii resulted in a marked decrease in reproductive capacity, consistent with the priority allocation of resources to compensational leaf area growth.  相似文献   

19.
Summary. Seedlings and plants derived from single-node rhizome fragments of Agropyron repens and Agrostis gigantea were grown in au unheated glasshouse, separately or together with wheat ( cv. Kolibri), in sandy loam soil in well-spaced pots, adequately watered and moderately fertilized. Samples of crop and weeds were taken for growth analysis in mid- May, late June and early August (when the wheat was ripe).
On average, wheat decreased the weight of weed shoots by 84% and of rhizomes by 77%, but the weeds decreased the weight of wheat shoots by only 7% and of grain by 13%. Without wheat, seedlings of both weed species had, by late June, grown as much as plants from rhizomes, but with wheat, the weed seedlings were throughout most of the experiment more susceptible to competition than were plants from rhizomes. There was no simple relationship between the final dry weights of the weeds and the amount they decreased wheat yield: although Agropyron seedlings in competition with wheat were much lighter than Agrostis from rhizomes, they decreased grain yield of wheat as much, suggesting that they competed more intensely for a limiting factor, possibly nitrogen.
It is concluded that the faster initial growth rate of wheat seedlings relative to the weeds from rhizomes and a larger initial seed reserve relative to the weed seedlings enabled the wheat to dominate the weeds.
Comparaison de la croissance et comportement compétitif de plantules et de plantes issues de rhizomes d'Agropyron repens ( L.) Beauv. et d' Agrostis gigantea Roth  相似文献   

20.
本试验采用砂培法,以18%(w/V)聚乙二醇(PEG6000)模拟水分胁迫研究18份白菜型冬油菜芽期根系特征,并结合盆栽试验研究根系特征与抗旱性关系。结果显示,水分胁迫对白菜型冬油菜侧根数、根重、根冠比有显著的抑制作用,对根长影响相对较小。相关性分析结果显示:相对侧根数、相对根长与相对活力指数之间呈显著正相关,可以作为白菜型冬油菜抗旱评价的辅助指标。不同来源的材料在根系侧根数、根重、根冠比方面差异显著,可作为区别不同来源材料抗旱性强弱的指标。对材料抗旱性进行聚类分析,在距离10时18份材料可以分五个类群,其中A类抗旱性最强,平均相对侧根数72.90%、平均相对根长100.37%、平均相对根重79.60%、平均相对根冠比119.93、平均相对活力指数0.64。根据相对活力指数及聚类分析结果,筛选出抗旱性较强的3份白菜型冬油菜:宁油2号、陇油7号和平油1号。对比分析盆栽试验,幼苗期总生物量干重与根冠比、根系干重、地上部干重、主根长均呈极显著正相关;芽期PEG胁迫下根系特征分析结果显示:早期生长活力较好的材料在盆栽试验有较高的生长势。早期采用模拟干旱的方法可以筛选抗旱性较强的材料。  相似文献   

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