马来酰肼对菊花花期叶片几个与衰老有关的生理指标的影响   总被引：1，自引：1，他引：1  

刘海英  崔长海  李慧  付帅阳  左爱辉 《安徽农业科学》2008,36(26)

[目的]为利用MH对菊花花期进行栽培调控提供理论指导。[方法]以秋菊"姹紫嫣红"品种为试材,在其营养生长期,以不同浓度马来酰肼(MH,100、200和300 mg/L)的水溶液进行叶面喷雾处理,初步研究了MH对菊花花期叶片几个与衰老有关的生理指标的影响及其与开花的关系。[结果]MH处理降低了菊花花期叶片中超养阴离子(O2.-)的产生速率、超氧化物歧化酶(SOD)活性(100 mg/LMH处理因高于对照除外)、丙二醛(MDA)含量和电解质渗漏率。MH处理延迟了菊花的花期,在MH 100~300 mg/L浓度范围内,对菊花的延迟效应为4.2~16.6 d,且随着MH浓度的提高,处理效应逐渐增强。[结论]采用叶面喷施不同浓度MH对秋菊在短日照条件下的开花时间具有明显的调节效应。  相似文献   

The Maturation and Senescence in Relation to Ca2+ , CaM Content and Ca2+ -ATPase Activity and Active Oxygen Metabolism in Strawberry Fruits   总被引：1，自引：0，他引：1  

GUAN Jun-feng  GAO Min  FAN Xiu-cai  GU Cai-qin  LI Guang-min  ZHANG Ji-shu 《中国农业科学(英文版)》2002,1(10):1151-1155

The changes in content of Ca2 + and CaM, Ca2 + -ATPase activity and active oxygen metabolism during strawberry (Fragaria ananassa Duch. cv. Chunxing) fruits maturation and senescence were investigated in this study. The results showed that the soluble Ca2 + content and SOD activity in fruits tended to decline and O2.-production rate to increase, the Ca2+ -ATPase activity peaked at first and then declined during fruits maturation and senescence. There were the highest CaM content at white stage in preharvest fruits and at marked senescence stage in postharvest ones. The above biochemical changes in fruits stored at low temperature (4℃) were slower than those stored at normal temperature(25℃ ). Thus, it indicated that the stimulation of calcium messenger system and accumulation of active oxygen free radical were closely related to fruits maturation and senescence.  相似文献   

高等植物衰老的机理研究   总被引：6，自引：0，他引：6  

王孝威  曹慧 《山西农业大学学报(自然科学版)》2004,24(4):416-419

衰老是植物生长发育进程中的最后阶段,与活性氧伤害有着密切的关系。本文从活性氧、自由基的产生,对植物的伤害及衰老的细胞程序性死亡理论方面的近期研究进行了综述,并对下一步的研究作出了展望。  相似文献   

水稻抽穗期喷施6—BA,ABA对旗叶衰老及同化物运输的影响   总被引：3，自引：0，他引：3  

蔡永萍  陈静娴 《安徽农业科学》1996,24(2):113-115

探讨了水稻抽穗期喷施6－BA、ABA对旗叶衰老及同化物运输的影响。结果表明：水稻抽穗期喷施6－BA，能延缓旗叶叶片衰老，提高旗叶光合速率及同化物输出能力。抽穗期喷施ABA，对旗叶光合速率、叶面积及叶绿素含量影响不大，主要是增加旗叶鞘糖含量，促进同化物运输。  相似文献   

暗诱导油菜子叶衰老过程G-6-P脱氢酶和乙醇脱氢酶活性的变化   总被引：7，自引：0，他引：7  

杨万年  林志福  任国领  杨莉  吕应堂 《中国油料作物学报》2003,25(3):42-45

以离体油菜子叶为材料，研究了暗诱导子叶衰老过程中G-6-P脱氢酶(G6PDH)和乙醇脱氢酶(ADH)活性的变化。结果表明在暗诱导衰老过程中，2种酶的活性均呈急速下降的趋势。暗诱导ld G6PDH活性下降了40％以上，第4d活性下降了80％以上。G6PDH活性的下降可能是导致植物细胞衰老过程中活性氧水平上升的因素之一，磷酸戊糖途径(PPP)活性的调节可能在诱导植物细胞的衰老中有重要作用。ADH在正常油菜子叶中维持有一定的活性，但在暗诱导离体子叶衰老过程中，ADH活性迅速下降，暗诱导ld活性下降了40％以上，第3d活性下降了60％以上。推测ADH活性变化可能对于衰老的诱导和加剧有重要意义。  相似文献   

下层土壤容重对玉米生育后期叶片衰老的生理效应   总被引：6，自引：1，他引：6  

李潮海  赵霞  王群  郝四平 《玉米科学》2007,15(2):061-063

采用桶栽法研究了下层土壤容重对玉米生育后期叶片衰老的生理效应。结果表明,随着下层土壤容重的增加,玉米单株叶面积下降;容重越大,叶面积指数下降幅度越大,玉米生育后期叶片衰老速度越快,SOD酶活性降低越多,MDA含量增加越多。  相似文献   

遮光对不同基因型玉米叶片衰老和产量的影响   总被引：8，自引：4，他引：8  

李潮海  赵亚丽  王群  栾丽敏  李宁 《玉米科学》2005,13(4):070-073

采用盆栽试验,研究了遮光对不同基因型玉米叶片衰老和产量的影响。结果表明,苗期遮光和穗期遮光均使玉米叶面积指数L(AI)降低,但粒期遮光则使玉米生育后期LAI下降减缓。遮光条件下生长的玉米叶片SOD酶活性升高,MDA含量降低。不同时期遮光处理均可导致玉米减产,减产程度为粒遮>穗遮>苗遮。除千粒重和穗粗外,遮光处理对其它穗部性状指标的效应值均达极显著水平。遮光对玉米叶片衰老和产量的效应在不同基因型之间表现出明显差异。  相似文献   

1-Methylcyclopropene (1-MCP)-induced protein expression associated with changes in Tsai Tai (Brassica chinensis) leaves during low temperature storage     

《Postharvest Biology and Technology》2014

Leaf yellowing is an early symptom of senescence and greatly affects the commercial value of leafy vegetable products. The ethylene action inhibitor 1-methylcyclopropene (1-MCP) has been widely studied regarding its effects on senescence, but little is known on how it influences the protein expression profile of leafy vegetables in storage. In this study, by using a proteomic approach, changes in proteomic profile induced by 1-MCP in Tsai Tai (Brassica chinensis) leaves during storage under low but non-freezing temperature were investigated. Compared with the control, 1-MCP treatment inhibited leaf etiolation and reduced weight loss of Tsai Tai stored at 1 °C, indicating that it delayed senescence. Two dimensional electrophoresis revealed 16 differentially accumulated protein spots, 12 of which were successfully identified by mass spectrometry. A comparison between the control and the 1-MCP-treated Tsai Tai showed that 1-MCP enhanced levels of four proteins involved in photosynthesis, i.e. photosystem II protein, oxygen-evolving enhancer protein 2, chloroplast ribulose 1,5-bisphosphate carboxylase/oxygenase activase and high molecular weight RuBisCO, inhibited malate dehydrogenase, a key enzyme involved in the tricarboxylic acid cycle, downregulated gibberellin 2-beta-dioxygenase expression, a key enzyme involved in biosynthesis of active gibberellins, and suppressed glutathione s-transferase, an important scavenger for reactive oxygen species. These results imply that 1-MCP could maintain leaf capacity for carbon assimilation, inhibit the tricarboxylic acid cycle, induce biosynthesis of GAs and reduce levels of reactive oxygen species, which together may have contributed to inhibition of leaf yellowing and delay of senescence.  相似文献   

Effect of red and blue LED light irradiation on ascorbate content and expression of genes related to ascorbate metabolism in postharvest broccoli     

《Postharvest Biology and Technology》2014

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Pre-harvest calcium application increases biomass and delays senescence of broccoli microgreens     

《Postharvest Biology and Technology》2014

Microgreen consumption has been steadily increasing in recent years due to consumer awareness of their unique color, rich flavor, and concentrated bioactive compounds. However, industrial production and marketing is limited by their short shelf-life associated with rapid deterioration in product quality. This study investigated the effect of pre-harvest calcium application on the post-harvest quality and shelf-life of broccoli microgreens. Broccoli microgreen seedlings were sprayed daily with calcium chloride at concentrations of 1, 10 and 20 mM, or water (control) for 10 days. The fresh-cut microgreens were packaged in sealed polyethylene film bags. Package headspace atmospheric conditions, overall visual quality and tissue membrane integrity were evaluated on days 0, 7, 14, and 21, during 5 °C storage. Results indicated that the 10 mM calcium chloride treatment increased the biomass by more than 50%, and tripled the calcium content as compared to the water-treated controls. Microgreens treated with 10 mM calcium chloride spray exhibited higher superoxide dismutase and peroxidase activities, lower tissue electrolyte leakage, improved overall visual quality, and reduced microbial growth during storage. Furthermore, calcium treatment significantly affected expression of the senescence-associated genes BoSAG12, BoGPX6, BoCAT3 and BoSAG12. These results provide important information for commercial growers to enhance productivity and improve postharvest quality and shelf-life, potentially enabling a broadening of the retail marketing of broccoli microgreens.  相似文献