EFFECTS OF HOMOBRASSINOLIDE APPLICATION ON PLANT-METABOLISM AND GRAIN-YIELD UNDER IRRIGATED AND MOISTURE-STRESS CONDITIONS OF 2 WHEAT-VARIETIES

被引:189
作者
SAIRAM, RK
机构
[1] Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi
关键词
HOMOBRASSINOLIDE; IRRIGATED; MEMBRANE STABILITY; MOISTURE-STRESS; NITRATE REDUCTASE ACTIVITY; PHOTOSYNTHESIS; TRITICUM AESTIVUM;
D O I
10.1007/BF00025220
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Homobrassinolide (BR) was applied either as a seed treatment or foliar spray to two contrasting wheat varieties, viz. C306 (drought tolerant) and HD2329 (drought susceptible), to examine its effects on plant metabolism and grain yield under irrigated and moisture-stress/rainfed conditions. BR application resulted in increased relative water content, nitrate reductase activity, chlorophyll content and photosynthesis under both conditions. BR application also improved membrane stability (lower injury). These beneficial effects resulted in higher leaf area, biomass production, grain yield and yield related parameters in the treated plants. All the treatments were significantly better than the untreated control. Generally, 0.05 ppm either as a seed treatment or foliar spray was more effective than the 0.01 ppm treatment. The drought-tolerant genotype C306 showed more response to BR application under moisture-stress/rainfed condition than HD 2329. Increased water uptake, membrane stability and higher carbon dioxide and nitrogen assimilation rates under stress seemed to be related to homobrassinolide-induced drought tolerance.
引用
收藏
页码:173 / 181
页数:9
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