灌浆对小麦旗叶光合功能的影响   总被引：2，自引：0，他引：2  

张成军  陈国祥  施大伟  黄春娟  庄丽娟  陈利 《河南农业科学》2005,(2):18-21

以高产小麦新品种宁麦 9号为材料 ,通过去穗处理 ,研究了灌浆对小麦旗叶光合功能的影响。结果表明 ,去穗处理与对照 (没有去穗 )相比 ,旗叶的比叶重 (SLM )、光合速率 (Pn)和羧化效率 (CE)较高 ,呼吸速率 (Rd)和丙二醛 (MDA)含量较低 ,而叶片相对含水量 (RWC)、气孔导度 (gs)和叶肉导度 (gm)没有显著差异。因此 ,灌浆时由于低的CE和高Rd 导致光合功能衰退 ,加速了旗叶的衰老。  相似文献   

NAA对冷藏梨果实衰老的缓解作用     

刘招龙  张绍铃 《勤云标准版测试》2005,(6)

梨果实在低温下贮存,随着时间的推移而逐渐衰老,用不同浓度的NAA溶液处理梨果实。结果发现,5mg/L的NAA溶液能相应地提高蛋白质、ASA、GSH的含量;降低MDA含量及O2-的产生速率;抑制SOD、CAT和POD活性的下降,初步确定,用5mg/LNAA溶液处理梨果实,可缓解衰老。  相似文献   

茉莉酸在植物衰老中的作用     

葛云侠  许建秋  刘延吉  李阳  史振声 《安徽农业科学》2008,36(22)

首先介绍了茉莉酸生物合成途径及合成过程中各种酶在衰老过程中的表达情况,然后综述了茉莉酸与衰老激素乙烯和脱落酸在信号转导途径中的关系,以及茉莉酸抑制植物光合作用促进叶片衰老,茉莉酸激活衰老基因SAGs等方面的研究进展。  相似文献   

The Storability and Its Regulatory Mechanism of Huanghua Pear(Pyrus pyrifolia Nakai. )Fruit as Influenced by Postharvest Treatments     

DOU Shi-juan  CHEN Kun-song  U Jun-liang  ZHENG Jin-tu 《中国农业科学(英文版)》2002,1(11):1238-1245

Different temperatures and PEF packing treatments were carried out on postharvest Huanghua pear fruit to investigate their effects on fruit storability and the regulatory mechanism. LOX activity, O2- content, AOS activity, ACC synthase activity, ACC content, ACC oxidase activity and ethylene production changed with peaks in the ripening fruit at 20℃ and were inhibited by cold storage, incidence of fruit wooiness and fruit decay were lightened as well. Low temperature combined with PEF packing(PEF1 and PEF2)treatmernts could further improve the fruit storability, maintain preferable quality. There was no significant difference between PEF1 and PEF2 both during cold storage at 1℃ and shelf life at 20℃. The recommended storage period of Huanghua fruit was two months at 1℃ and could be extended one month longer with PEF packing treatments.  相似文献   

密度、氮素对优质弱筋小麦宁麦9号旗叶早衰的调控效应   总被引：2，自引：2，他引：2       下载免费PDF全文

李春燕  封超年张容 张影郭文善  朱新开彭永欣 《麦类作物学报》2005,25(5):60-64

为探讨弱筋小麦植株早衰生理机制及其调控途径,研究了密度及氮素与宁麦9号旗叶早衰的关系。结果表明,密度为240万/hm2、施氮量240 kg/hm2、基肥与追肥比例为7∶3的处理较其他处理能适当延缓旗叶中叶绿素的降解,叶片中保持较高水平的保护酶活性,细胞膜脂过氧化产物M DA含量低,同时增加了叶片内源激素ZR、iPA含量,减少了ABA的累积量,较好地协调了内源激素的平衡,在很大程度上延缓了旗叶的早衰,有利于产量与品质协调发展。  相似文献   

Effects of partial defoliation on closed canopy Eucalyptus globulus Labilladière: Growth, biomass allocation and carbohydrates     

A.G. Quentin  C.L. Beadle  A.P. O’Grady  E.A. Pinkard 《Forest Ecology and Management》2011,261(3):695-702

Herbivory caused by leaf-eating insects continues to be a severe risk to forest trees and forest stands. Besides quantifying the extent of defoliation, the quantification of the trees’ response to the loss of biomass is a challenge to plant ecologists and foresters alike, and an important precondition for the application of appropriate silvicultural measures. While many defoliation studies target small trees as model systems, little is known about the effect of defoliation on larger trees. In the present study, we investigated the effects of 45% removal of leaf area on growth, biomass allocation and carbohydrates of 13 m tall, four-year-old, plantation Eucalyptus globulus Labill. in southern Tasmania. Responses were measured in three crown zones (lower, middle, upper) over a period of 11 months. Height increment was unaffected by defoliation, but diameter increment was significantly reduced 155 days after treatment. Defoliation treatment had no effect on stem volume and biomass partitioning compared with the control treatment. Trees responded to defoliation by decreased branch senescence in the lower crown, greater leaf area development in the mid crown and increased specific leaf area. Defoliation reduced concentration of soluble sugars (SS) in foliage by 22% and the pools of SS in the coarse roots by 34%. Decrease in root SS was only observed in 10-15 mm diameter class and the rootball. We concluded that this four-year-old E. globulus stands with a closed canopy was able to tolerate a single, partial artificial defoliation event, which is similarly observed with younger trees.  相似文献   

过量表达中国水仙(Narcissus tazetta var.chinensis)NTAG1基因促进拟南芥早花和衰老   总被引：1，自引：1，他引：0  

邓新杰  熊莉君  王洋  孙越  李小方 《分子植物育种》2011,9(2):238-244

中国水仙有金盏银盘和玉玲珑两个品种,玉玲珑由于雄蕊瓣化而形成重瓣花,而目前人们对这种重瓣花的分子机理不清楚.根据重瓣花多与C类花器官特性基因相关,本文通过RT-PCR方法分别克隆和分析了两种花型水仙品中的AGAMOUS同源基因NTAG1基因,序列分析表明,两种水仙中该基因序列完全相同,RT-PCR半定量分析它们的表达模...  相似文献   

乙烯对叶菜衰老的影响及光对乙烯作用的增效作用   总被引：4，自引：0，他引：4  

张丽欣  宗汝静 《华北农学报》1987,(4)

采用气流系统用4ppm乙烯对结球生菜和菠菜分别在光照和黑暗条件下连续处理5天,结果发现:无论在光照和黑暗条件下,与对照相比,乙烯处理均使这两种叶菜的叶绿素和可溶性蛋白质含量减少,使过氧化物酶活力增强;同样乙烯处理,在光照条件下要比在黑暗条件下效果明显;乙烯处理不改变过氧化物酶同工酶酶谱,但使结球生菜可溶性蛋白质区带数目由对照的5条增加到7条;光照条件下乙烯处理的结球生菜叶片锈褐色明显比黑暗条件下乙烯处理的严重.  相似文献   

特早熟温州蜜柑‘胁山’果实浮皮过程中内源游离多胺含量的变化   总被引：5，自引：1，他引：4  

魏岳荣  张秋明  郑玉生 《果树学报》2001,18(6):325-328

以特早熟温州蜜柑‘胁山’为试材,研究了内源游离多胺含量与果实浮皮的关系。结果表明:‘胁山’果实浮皮过程中内源游离多胺总量减少,腐胺(Put)迅速积累,亚精胺(Spd)和精胺(Spm)含量持续降低,Put/(Spd+Spm)值逐渐增大,证明柑橘果实浮皮可能是果实的过早衰老引起的。外源Spd能有效地降低Put/(Spd+Spm)值,增加内源多胺总量,从而延缓果实衰老,推迟浮皮的发生。  相似文献   

苹果果实衰老与活性氧代谢的关系   总被引：24，自引：3，他引：21  

关军锋  束怀瑞 《园艺学报》1996,23(4):326-328

测定了苹果新红星和红富士品种在不同成熟衰老过程中乙烯与活性氧代谢的变 化。结果表明，在室温和冷藏条件下贮放，随贮放迸程果肉硬度下降，超氧物歧化酶和过氧化 物酶活性降低。低温抑制果实丙二醛积累，推迟乙烯峰期出现，并且保持组织中较高的超氧物 歧化酶活性。温度对过氧化物酶活性的作用效果困品种而异。  相似文献