共查询到20条相似文献，搜索用时 64 毫秒
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不同预处理对湿地松种子活力的影响 总被引：2，自引：0，他引：2
采用不同的预处理措施对贮藏15个月的湿地松种子进行处理。结果表明：不同的预处理措施对湿地松种子的活力影响不同。赤霉素（GA3）和聚乙二醇（PEG）处理，能显著提高种子活力。用尿素处理也能在一定程度上提高种子活力。而有机溶剂丙酮处理，对湿地松种子活力未见有明显影响。 相似文献
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青榨槭属槭树科槭属落叶乔木，高8米—12米。经吉林省集安市新星园艺场多年移植繁育、驯化栽培试验，青榨槭栽植成活率高、生长快，园林绿化效果好，观赏价值高。 相似文献
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毛竹种子人工老化过程中生理生化变化 总被引：1，自引：0，他引：1
研究人工老化过程中毛竹种子活力及其生理生化变化过程.结果表明:人工老化处理后,种子发芽率、发芽指数和活力指数均先快速下降后缓慢下降,活力指数下降较发芽率和发芽指数快.老化6天时活力指数下降72％,老化12天时种子活力基本丧失.伴随着种子活力下降,表现出种子浸出液相对电导率和可溶性糖含量升高,MDA含量升高,POD,SOD和CAT酶活性降低,可溶性蛋白质含量降低,内源GA3和IAA含量降低,ABA含量升高,GA3/ABA比值降低等一系列生理生化变化.相关分析表明:SOD活性、CAT活性、可溶性蛋白和GA3,IAA,GA3/ABA,与种子活力呈极显著正相关;种子浸出液相对电导率、MDA和ABA含量呈极显著负相关.膜脂过氧化引起的生物膜损伤是加速毛竹种子老化的重要原因,内源激素失衡也是影响种子萌发和加速老化的主要因素之一. 相似文献
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PEG模拟水分胁迫对香椿种子萌发的生理生化指标影响 总被引：2，自引：0，他引：2
以香椿种子为材料,采用5%、10%、15%、20%的聚乙二醇(PEG-6000)溶液对香椿种子萌发进行人工水分胁迫处理,研究不同处理对种子萌发及幼苗生理生化指标的影响。结果表明,不同浓度的PEG处理胁迫对香椿种子的萌发均有一定的延缓作用;随着PEG浓度的上升,香椿种子的发芽率、发芽势、发芽速度及幼芽长度都呈现明显的下降趋势,POD、SOD活性呈上升趋势;低浓度的PEG对香椿幼根的生长有促进作用,随着PEG浓度的增加对香椿幼根的生长均表现抑制作用。 相似文献
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大叶槭的种子为翅果,种皮比较薄,极易吸水,子叶似螺旋形盘在种皮内。槭属种子种皮固然很薄易吸水,但要使其发芽是比较困难的。据报道,槭树种子要经过0—5℃温度层积20天以后,才能作发芽试验,而且发芽试验的过程持续时间较长。去年,我们设想单用发芽来检验,并缩短检验时间,对大叶槭、青榨槭、五裂槭的种子,采用了浸种后剪开部分种皮等方法试验,结果没有达到预期效果。在去年试验基础上,今年改去种皮发芽试验,取得了一定的成效。 相似文献
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青榨槭属槭树科槭属落叶乔木,高8米-12米。经吉林省集安市新星园艺场多年移植繁育、驯化栽培试验,青榨槭栽植成活率高、生长快,园林绿化效果好,观赏价值高。青榨槭因树皮绿色似青蛙皮而得名。单叶对生,广卵形或卵形,长10厘米-16厘米,宽7厘米-14厘米,上部三浅裂,有时五裂,基部心形,边缘有二重锯齿,叶柄长3厘 裂,基部心形,边缘有二重锯齿,叶柄长3厘米-8厘米。总状花序顶生、下垂,花期5月,花后叶开放,有小花10枚-20枚,花瓣带绿色。小坚果卵园形,果期9月。青榨槭耐寒,能抵抗-30℃～-35℃的低温。耐瘠薄,适宜中性土。主、侧根发达… 相似文献
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青榨槭外植体消毒方法初步研究 总被引：1，自引：0，他引：1
以青榨槭带芽茎段为外植体,研究了取材时间、消毒剂种类以及处理时间对外植体灭菌效果的影响。结果表明,0.1%、0.2%升汞处理5 min或7 min的污染率显著低于1%次氯酸钠处理20 min或30 min;75%酒精浸60 s后,用0.1%的升汞消毒7 min和0.2%的升汞消毒5 min或7 min的处理间没有显著差异,其中75%酒精浸60 s后用0.1%的升汞消毒7 min的消毒效果最好,外植体污染率和存活率分别为1.9%和90.4%。4月中旬至7月中旬取材的外植体污染率均低于5%,而存活率均达90%以上,为青榨槭茎段外植体取材的最佳时期。 相似文献
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紫椴种皮对种子萌发的影响 总被引：1，自引：0，他引：1
用98％浓硫酸、10％氢氧化钠和70℃水浴分别处理紫椴的种子,再将处理后的种子进行吸胀和发芽试验的结果表明：紫椴种子吸水后,前期体积和质量均呈整体上升趋势,而浸泡6h以后,均出现下降的情况,说明紫椴种皮对种子的吸水过程基本没有阻碍作用;发芽率测定试验中,紫椴种子均未出现萌发现象,说明试验所用的处理方法不能达到促进紫椴种子萌发的目的。 相似文献
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对我国６个主要日本落叶松种子园种用价值测验的结果表明，各地种子园的遗传品质差异显著。种用价值大小排序为：天麻＞桓仁＞清凉山＞白旗寨＞赤峰＞大孤家＞对照。初选出遗传品质较高的天麻、桓仁和清凉山种子园，６年生（连苗期）幼林树高、胸径、材积生长量可分别获得８４％—１１０％、１２７％—２６７％、２６９％—６６３％的遗传增益。白旗寨、赤峰和大孤家３个种子园虽有一定改良效果，但都低于总平均水平，并与对照差异不显著。研究结果对豫西地区引种和推行种子园种子造林有重要指导作用对我国６个主要日本落叶松种子园种用价值测验的结果表明，各地种子园的遗传品质差异显著。种用价值大小排序为：天麻＞桓仁＞清凉山＞白旗寨＞赤峰＞大孤家＞对照。初选出遗传品质较高的天麻、桓仁和清凉山种子园，６年生（连苗期）幼林树高、胸径、材积生长量可分别获得８４％—１１０％、１２７％—２６７％、２６９％—６６３％的遗传增益。白旗寨、赤峰和大孤家３个种子园虽有一定改良效果，但都低于总平均水平，并与对照差异不显著。研究结果对豫西地区引种和推行种子园种子造林有重要指导作用 相似文献
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Effects of stratification, desiccation, radicle pruning, and season of sowing on Quercus vulcanica germination and growth were studied to identify optimum nursery procedures for artificial regeneration of this species. Following stratification (0, 2, 4 and 8 weeks), acorns were germinated, and acorn moisture content and germination performance were also determined at various times during desiccation. In early December unsprouted acorns were planted in containers, and in early April sprouted acorns, which had been stored in polyethylene bags at 4 °C, with radicles left intact or with radicles pruned back to 1.0 cm were planted in containers.Stratification for 2 and 4 weeks did not increase germination percentage but significantly increased germination rate. Germination percentage of the seeds dropped when the moisture content of the seeds was reduced by desiccation, and the critical minimum moisture content of the recalcitrant Q. vulcanica acorns was found to be 11–16%. Spring sowing of sprouted acorns altered the morphology the containerized seedlings and caused the formation of significantly more main roots, but resulted in significantly less shoot height and shoot dry weight. Spring-sown sprouted acorns had also a significant advantage over the fall-sown unsprouted acorns in seedling survival, and thus nursery personnel should not be concerned if acorns sprout before sowing. 相似文献
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1997年调查了长白山地区(Rhodiola sachalinensis)种子散布,发现高山红景天种子散布方向是不均匀的,以东部和西部最多。发芽试验的种子采自吉林省长白山和黑龙江省大海林迁地保护基地。种子采集后立刻用2%KNO3处理10小时、0.02%GA3处理5小时,结果显示迁地保护基地的高山红景天种子萌发率(85.33%)明显高于长白山(72.66%)。在0～5℃下贮存10个月之后,经上述不同浓度的激素处理,再测定发芽率。结果表明其发芽率为与刚采收时的发芽率(72.66%)差别不大,说明低温处理可明显延长种子寿命,同时发现,种子发芽率在一定程度上随激素浓度的增加而提高。图参9。 相似文献
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Assessing the characteristics of seed supply will be vital to better understand the dynamics of forest regeneration. In this study, we surveyed the aboveground vegetation, the seed rain, the seed bank, and natural seedling emergence in four typical 24-year-old plantations (eucalyptus, mixed-native, mixed-legume, and mixed-conifer) and a naturally successioned shrubland in southern China. The dominant species in the understory were similar among the five plant communities. The seed rain and the seed bank were dominated by shrubs and herbs but indigenous tree species were rare. Species that were common to all five-plant communities represented a great proportion of the seeds in the seed rain and seed bank. The seed rain consisted mostly of seeds derived from the local plant community. Seed abundance was greater in the seed bank than in the seed rain, and species richness was greater in the seed bank and in the corresponding plant community than in the seed rain. Species composition similarity between the seed rain, the seed bank, and the aboveground vegetation was low, because the seed rain contained much fewer species, and the seed bank and aboveground vegetation contained many different species, respectively. These findings indicate that both the seed rain and the seed bank play important roles in providing seeds for plant recruitment in the understory, but the seed bank contributes more than the current seed rain to the diversity of recruited plants. The current plant community has little impact on the qualitative composition of the seed rain and seed bank. Based on these data, it appears that succession to the desired zonal, mature forest community is unlikely to result from seeds in the seed rain or seed bank. Lack of seed availability of desired zonal mature forest species is the main bottleneck currently limiting succession in the plantations. Reintroduction of late-successional species could facilitate the desired succession. 相似文献
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野鸭椿种子发芽试验分析 总被引：1，自引：0，他引：1
促进野鸭椿种子的萌发,关键在于解决其种皮的坚硬致密和蜡质层等阻碍种胚吸水的问题.一定温度的热水浸泡种子,可以软化蜡质层和木质种皮,促进种子吸水膨胀,开裂发芽.水温高低和浸泡时间影响处理效果,水温太低,效果不明显,过高的温度长时间浸泡易对种子内部细胞造成伤害.经方差分析、多重比较等方法,对实验室发芽试验和圃地发芽试验所获... 相似文献
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陕西省油松良种基地生产能力分析 总被引：3，自引：1，他引：3
对陕西省己建成的油松良种基地现实良种生产数量和质量分析结果表明,良种的遗传品质和播种品质基本上达到了营建初级种子园的目的,但基地生产能力较低,良种数量远远满足不了造林用种的需要。并对加强良种基地管理,提高良种生产能力提出了一些看法。 相似文献
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María E. Sánchez-Coronado Rosamond Coates Libertad Castro-Colina Alicia Gamboa de Buen Julio Paez-Valencia Víctor L. Barradas Pilar Huante Alma Orozco-Segovia 《Forest Ecology and Management》2007
To improve the restoration of tropical rain forests, we tested the germination of seeds of Omphalea oleifera collected from soil (S) and from trees (T) in the 2001 dry season (Spring), at the beginning of a dry season (2005a, winter) and in the rainy season (2005b, winter). All seeds had high water content (WC, 31–33%), and the lipid content varied from 14 to 46%. Seedlings from seeds collected in 2001 were subjected to moderate water stress as a preconditioning treatment for severe stress. T-seeds collected in the dry season had high WC, rapid and high germination percentage; S and T-seeds collected in winter (2005) had also high WC but were dormant. GA3 (250 ppm) broke this dormancy. S-seeds collected in the dry season or at the beginning of it had relatively low WC and low and delayed germination. Some 2001 S-seeds produced albino seedlings. The critical water content for maintaining ecological longevity in these seeds was ∼15%. Seeds collected in 2005b that were dehydrated for 20 days in a moist and fresh atmosphere lost their viability, showing recalcitrant behavior. T-seeds with the lowest lipid content (2005a) after dehydration maintained low germination (15 ± 18%). In all samples the seed size varied widely and was not predictive of seed WC. Embryos taken from dehydrated seeds had two to four times higher WC than the seeds, but germination did not take place. Laboratory and field germination of dormant seeds showed that viability may be maintained for at least 2–3 months on a moist substrate (soil or agar). Moderate water stress at the seedling stage reduced the efficiency of biomass production. Response to this water stress was expressed more in physiological traits than in morphological characters, consequently biomass allocation was maintained and plants retained most of their morphological characteristics (root:shoot ratio, leaf area ratio, specific leaf area, leaf weight ratio). Moderate water stress did not increase the tolerance of seedlings to severe stress, causing leaf shedding and plant death. For restoration purposes we recommend that T-seeds be germinated immediately avoiding dehydration. The use of S-seeds could result in unhealthy seedlings. Seed recalcitrance and the response to moderate water stress restrict germination and establishment to small gaps, where this species naturally grows. We suggest that before introducing O. oleifera in restoration programs, a plant cover should be built to reduce soil water deficit. It is necessary to improve methods to increase potential seed longevity in storage. 相似文献