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由浙江农业大学园艺系副教授李三玉主持和黄岩市、衢县等有关单位协作的一项科研新成果——“多效唑(PP333)对柑桔控梢保果作用及其机理研究”,经五年试验研究,已于1989年11月在衢县通过鉴定。 该项研究经在尾张温州蜜柑和椪柑上5年的系统深入试验,证明在柑桔花蕾期(春梢长2～5厘米时),以多效唑作叶面喷布(温州蜜柑500ppm、椪柑1000ppm),能控制春梢,抑制夏梢,促发秋梢;增加花量,提高座果率,增加产量,改进果实品质。效 相似文献
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1多效唑(PP333)的特性及使用方法多效唑低毒,对哺乳动物、鱼、鸟和无脊椎动物安全,对皮肤和眼睛有轻微刺激性。主要剂型为15%多效唑可湿性粉剂、21.5%多效唑水剂和25%多效唑乳油。多效唑具内吸性,果树根系和叶片均可吸收,是一种用途广泛的植物生长延缓剂、调节剂和杀菌剂。根部 相似文献
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以脱毒怀地黄为试材,对多效唑不同喷施浓度处理下脱毒怀地黄叶片光合色素含量、过氧化物酶(POD)活性、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、相对电导率(REC)等的变化进行了研究。结果表明:多效唑不同喷施浓度处理的脱毒怀地黄叶片光合色素含量,SOD、POD、CAT活性均高于对照,而REC均低于对照;脱毒怀地黄叶片光合色素含量,SOD、POD、CAT活性均随多效唑浓度的增加而逐渐提高,浓度为200mg/L时效果最好;REC随多效唑处理浓度的增加逐渐减小。 相似文献
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采用不同浓度的多效唑(0、300、600、900、1200 mg/L)对盆栽草坪草进行叶面喷施,以研究多效唑对草坪草多年生黑麦生长特性的影响.结果表明:多效唑能有效地抑制多年生黑麦草的生长,降低植株高度,提高草坪密度,并使叶片颜色加深,叶片变短,改变生长格局.因此,多效唑能有效地改善多年生黑麦草的坪用性状. 相似文献
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1多效唑多效唑代号PP333,低毒,对哺乳动物、鱼、鸟和无脊椎动物安全,对皮肤和眼睛有轻微刺激性。主要剂型为15%多效唑可湿性粉剂、21.5%多效唑水剂和25%多效唑乳油。多效唑具内吸性,果树根系和叶片均可吸收,是一种用途广泛的植物生长延缓剂、调节剂和杀菌剂。根部吸收作用迟缓,叶片吸收作用快,时间短,持效期30d左右。多效唑能抑制果 相似文献
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多效唑(PP333)是一种植物生长延缓剂,在果树上应用可有效地抑制新梢生长,促进花芽分化。目前已在落叶果树的苹果、梨、桃、樱桃,葡萄等及常绿果树的杨梅上得到应用。在柑桔上已有对温州蜜柑、本地早、雪柑的抑梢保果及促进椪柑成花方面的报道。本试验探讨在盆地气候条件下,多效唑抑制锦橙夏梢及对果实的效应。 相似文献
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1多效唑（PP333）的特性及使用方法
多效唑低毒，对哺乳动物、鱼、鸟和无脊椎动物安全，对皮肤和眼睛有轻微刺激性。主要剂型为15％多效唑可湿性粉剂、21．5％多效唑水剂和25％多效唑乳油。多效唑具内吸性，果树根系和叶片均可吸收，是一种用途广泛的植物生长延缓剂、调节剂和杀菌剂。 相似文献
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The purpose of this study was to examine the effect of paclobutrazol on the water consumption, plant water relations, gas exchange and development of strawberry tree seedlings (Arbutus unedo L.), to evaluate water resource management. Seedlings (8 cm in height) were subjected to a single drench of 60 or 100 mg of paclobutrazol and pot-grown in a greenhouse for 4 months. Untreated plants acted as control. Paclobutrazol reduced the development and improved the water status of the seedlings. At the end of the experimental period, it was seen that the two doses studied had reduced the plant dry weight, plant height and foliar development compared with the untreated plants. Paclobutrazol significantly reduced water consumption by 10% (60 mg) and 20% (100 mg) compared with the control. Plants treated with 100 mg showed the highest leaf water potential values at predawn. Paclobutrazol-treated plants presented turgor potential at values midday higher than control. This retardant stimulated a more efficient stomatal regulation, permitted an improved water status; however, it altered photosynthesis, reducing the plant growth. The lowered water consumption in paclobutrazol-treated plants was the result of a combination of mechanisms which reduced water loss through transpiration. 相似文献
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疏果对梨果实糖积累及叶片光合特性的影响 总被引：5，自引：1，他引：4
以‘丰水’梨为材料,研究不同疏果程度和疏果时期对果实糖积累及源叶光合特性的影响,结果表明：随着疏果程度增加,果实单果质量、可溶性总糖含量均显著提高,重度疏果、中度疏果与不疏果（对照）相比,单果质量分别增加172.5%和95.9%,可溶性总糖含量分别增加31.8%和20.7%。疏果对可溶性总糖组分的影响主要是增加蔗糖和山梨醇含量;重度疏果、中度疏果与不疏果（对照）相比,蔗糖含量分别增加134.8%和91.5%,山梨醇含量增加53.2%和26.7%,葡萄糖含量减少45.0%和22.7%。不同时期疏果与不同疏果程度相似,表现为疏果早的果形大,蔗糖和山梨醇含量高,花后90 d重度疏果仍能提高果实糖积累水平。花后80 d不疏果的叶片净光合速率最高,而花后110 d则相反,重度疏果的处理最高。花后110 d不疏果果台副梢叶片的叶绿体嗜锇颗粒增多,片层结构模糊,说明不疏果植株叶片在后期光合速率下降与叶绿体结构改变及其衰老有关。 相似文献
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以长白山蹄叶橐吾、复序橐吾、狭苞橐吾为试材,对其不同遮荫条件下的形态指标、叶绿素含量、光合形态指标及叶绿素荧光参数等进行测定,并根据其叶绿素含量、光合速率和叶绿素荧光参数来探讨3种橐吾的耐荫性。结果表明:在50%遮荫下的狭苞橐吾、复序橐吾和在70%遮荫的蹄叶橐吾,其形态、叶绿素含量、净光合速率、日均净光合速率、原初光能转化效率(Fv/Fm)和光化学淬灭系数(qP)达最大,叶绿素a/b值最低,但非光化学淬灭系数(NPQ)随遮荫度增加而降低。因此,狭苞橐吾和复序橐吾适宜生长在50%遮荫环境下,蹄叶橐吾适宜生在70%遮荫环境下;3种橐吾品种为耐荫性植物,其中蹄叶橐吾耐荫性最高,狭苞橐吾和复序橐吾次之。 相似文献
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遮光对青榨槭光合速率及叶绿素荧光参数的影响 总被引：16，自引：0，他引：16
研究了遮光15%、35%、50%和全光照处理对青榨槭新梢生长、叶片色素含量、净光合速率以及叶绿素荧光参数的影响。结果表明, 随着遮光度增加, 叶片色素含量增加, 叶绿素a /b减小; 叶片净光合速率( Pn) 、初始荧光( Fo) 、原初光能转化效率( Fv/Fm) 和光化学猝灭系数( qP) 增加, 但非光化学猝灭系数( qN) 降低。全光照和遮光15%处理条件下, Pn日变化呈双峰曲线, 而35%和50%处理条件下呈单峰曲线; 遮光35%和50%处理条件下Fv/Fm日变化幅度较小, 15%和全光照处理条件下Fv/Fm日变化呈先上升后下降再上升趋势。50%遮光处理青榨槭幼苗Pn最高, 新梢年生长量最大, 可在育苗生产中应用。 相似文献
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Olfa Boussadia Fethi Ben Mariem Beligh Mechri Wafa Boussetta Mohamed Braham Salem Ben El Hadj 《Scientia Horticulturae》2008,116(4):388-393
The effect of water deprivation on plant water status, photosynthetic gas exchange and fluorescence parameters in two different olive tree varieties (Olea europaea L. var. ‘koroneiki’, ‘Meski’) was studied. Two-year-old olive trees, grown in pots in greenhouse, were subjected to one of three drought treatments (i.e., mild, moderate and severe drought stress) and compared to control trees. Both the leaf water potential (Ψw) and the relative water content (RWC) of the two varieties decreased with increasing levels of drought stress. Koroneiki showed higher (less negative) values of Ψw and lower values of RWC than the Meski, particularly during severe drought stress.
Net photosynthetic assimilation and stomatal conductance declined with drought. This inactivation of photosynthetic activity was accompanied by changes in the fluorescence characteristics. The PSII maximal photochemical efficiency (Fv/Fm), the intrinsic efficiency of open PSII reaction centres (Fv′/Fm′), the photochemical efficiency of PSII (ΦPSII) and the total electron flow (Jt) decreased during the development of drought stress.
The non-quenching photochimique (qN) showed an increase in the response to water deficit. These observations are discussed in relation to the strategies developed to grow drought-resistant olive trees in arid areas. 相似文献
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遮荫和环剥对荔枝枝梢生长和光合生理的影响 总被引：7，自引：0，他引：7
以12年生‘黑叶’荔枝（Litchi chinensis Sonn.‘Heiye’）为研究材料,进行遮荫、环剥及遮荫 + 环剥处理,观测这些处理对新梢生长,以及叶片净光合速率、叶片光系统Ⅱ（PSⅡ）最大光量子效率（Fv/Fm）和淀粉含量的影响。结果表明：遮荫处理和环剥处理均能显著抑制枝梢生长,降低叶片的净光合速率,但两种处理抑制光合作用的机制各异。其中,环剥处理导致叶绿素含量降低,产生永久性光抑制,显示光系统Ⅱ（PSⅡ）受到破坏,因此,环剥处理导致光合作用的降低与光反应系统的破坏有关;遮荫下叶片最大光化学效率Fv/Fm维持正常,淀粉含量降低,但即使在相同的人工光源下,光合作用速率同样低于对照,可能主要与暗反应系统活性减弱有关;而遮荫可显著缓解环剥对光反应系统的破坏效应。 相似文献
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J. W. Palmer Y.-L. Cai Y. Edjamo 《The Journal of Horticultural Science and Biotechnology》2013,88(3):319-325
Flower clusters were removed at full bloom from ten year old ‘Cox’s Orange Pippin’ trees on M.9 rootstocks, over the whole tree, on alternate branches or on whole sides. Mean fruit weight per tree at harvest was linearly dependent on leaf area per fruit and on light interception per fruit, both relationships accounting for over 90% of the variance. These relationships did not differ between treatments, implying either a mobile pool of carbohydrate or photosynthetic adjustment within the tree to crop load. Measurements of leaf photosynthesis in July and September showed no statistically significant differences in photosynthetic rate of spur or extension shoot leaves on bearing or non-bearing branches. Although the treatments caused no overall effects on shoot growth or leaf area per tree, sides of trees without fruit had greater leaf area and shoot growth than did sides bearing fruit. Fruit mineral composition and percentage dry weight were not affected by treatment except where the treatments significantly altered fruit size. In the following spring, although the treatments did not affect the total number of flower buds produced, branches that were deflowered in the previous spring carried significantly more flower buds than did branches which had cropped. 相似文献
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以"羊角酥"甜瓜(Cucumis melo L.)为试材,分别利用浓度为12.5、25.0、37.5、50.0、62.5、75.0 mmol·L-1Na2CO3进行梯度胁迫处理,对碱胁迫下甜瓜幼苗生长状态、光合特性以及抗氧化能力进行分析,以期为甜瓜碱胁迫的适应性机制研究提供参考依据。结果表明:当Na2CO3浓度为75.0 mmol·L-1时,幼苗株高、茎粗及叶面积受到显著抑制。随着Na2CO3浓度增加,净光合速率(Pn)呈降低趋势,胞间CO2浓度(Ci)变化趋势反之;叶绿素(Chl)含量呈降低趋势;丙二醛(MDA)含量呈上升趋势,游离脯氨酸(Pro)含量在高浓度Na2CO3时急剧增加;超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均显著高于对照。Pn下降的主要原因是非气孔限制,高浓度(75.0 mmol·L-1)碱胁迫下,幼苗生长势受抑制,且MDA含量增加显著,Pro积累有利于提高幼苗自身的抗碱性。 相似文献