Stimulation of source-applied14C-sucrose export inVicia fabaplants by brassinosteroids, GA3and IAA

Petzold, U.; Peschel, Stefanie; Dahse, I.; Adam, G.

doi:10.1111/j.1438-8677.1992.tb00517.x

Cited by 26 publications

(14 citation statements)

References 29 publications

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“…This ultimately results in higher leaf area and biomass production. BR application is also reported to increase translocation [6,17] resulting in increased ear number, grain number per ear and 1000 grain weight and harvest index which contributed to higher grain yields.…”

Section: Resultsmentioning

confidence: 99%

Effects of homobrassinolide application on plant metabolism and grain yield under irrigated and moisture-stress conditions of two wheat varieties

1994

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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, 0.05ppm 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.

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Section: Resultsmentioning

confidence: 99%

Effects of homobrassinolide application on plant metabolism and grain yield under irrigated and moisture-stress conditions of two wheat varieties

1994

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“…But under drought-stressed conditions, the F v /F m of BR-treated soybean was significantly higher than that of the control plants. Petzold et al (1992) showed that BR treatment increased assimilate translocation resulting in increased ear number, grain number per ear and seed weight, which contributed to higher grain yields. In our study, BR enhanced translocation of assimilated 14 C from labeled soybean leaves to the other parts under both well-watered and droughtstressed conditions.…”

Section: Discussionmentioning

confidence: 98%

Brassinolide alleviated the adverse effect of water deficits on photosynthesis and the antioxidant of soybean (Glycine max L.)

et al. 2008

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Brassinolide (BR) is a relatively new plant growth regulator. To test whether BR could be used to increase tolerance to water deficits in soybean, the effects of BR application on photosynthesis, assimilate distribution, antioxidant enzymes and seed yield were studied. BR at 0.1 mg l -1 was foliar applied at the beginning of bloom. Two levels of soil moisture (80% field capacity for well-watered control and 35% for drought-stressed treatment) were applied at pod initiation. BR treatment increased biomass accumulation and seed yield for both treatments. Drought stress inhibited translocation of assimilated 14 C from the labeled leaf, but BR increased the translocation for both treatments. Drought stress depressed chlorophyll content and assimilation rate (A), while chlorophyll content and A of BR-treated plants were greater than that of drought-stressed plants. BR treatment increased maximum quantum yield of PS II, the activity of ribulose-1,5-bisphosphate carboxylase, and the leaf water potential of drought-stressed plants. Treatment with BR also increased the concentration of soluble sugars and proline, and the activities of peroxidase and superoxide dismutase of soybean leaves when drought-stressed. However, it decreased the malondialdehyde concentration and electrical conductivity of leaves under drought stress. This study show that BR can be used as a plant growth regulator to enhance drought tolerance and minimize the yield loss of soybean caused by water deficits.

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“…In view of some earlier studies, the improving effect of 24-epibrassinolide on grain yield may have been due to greater translocation of photoassimilates to grains during the grain filling stage thereby increasing grain weight. For example, exogenous application of BRs in bean enhanced sink strength and phloem unloading (Petzold et al 1992). While working with cucumber, Nakajima and Toyama (1999) showed that root applied 24-epibrassinolide promoted transport of 14 C-labeled sucrose from the primary leaf to the epicotyl.…”

Section: Discussionmentioning

confidence: 99%

Modulation of growth, photosynthetic capacity and water relations in salt stressed wheat plants by exogenously applied 24-epibrassinolide

2008

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Brassinosteroids promote the growth of plants and are effective in alleviating adverse effects of abiotic stresses such as salinity and drought. Under saline conditions, improvement in grain yield is more important than simple growth. Previously it was found that although foliar application of brassinosteroids improved growth of wheat plants, it did not increase grain yield. In present study, influence of root applied 24-epibrassinolide was assessed in improving growth and yield of two wheat cultivars. Plants of a salt tolerant (S-24) and a moderately salt sensitive (MH-97) were grown at 0 or 120 mM NaCl in continuously aerated Hoagland's nutrient solution. Different concentrations of 24-epibrassinolide (0, 0.052, 0.104, 0.156 lM) were also maintained in the solution culture. Exogenous application of 24-epibrassinolide counteracted the salt stress-induced growth and grain yield inhibition of both wheat cultivars. Of the varying 24-epibrassinolide concentrations used, the most effective concentrations for promoting growth were 0.104 and 0.052 lM under normal and saline conditions, respectively. However, root applied 0.052 lM 24-epibrassinolide enhanced the total grain yield and 100 grain weight of salt stressed plants of both cultivars and suggested that total grain yield was mainly increased by increase in grain size which might have been due to 24-epibrassinolide induced increase in translocation of more photoassimilates towards grain. Growth improvement in both cultivars due to root applied 24-epibrassinolide was found to be associated with improved photosynthetic capacity. Changes in photosynthetic rate due to 24-epibrassinolide application were found to be associated with non-stomatal limitations, other than photochemical efficiency of PSII and photosynthetic pigments. Leaf turgor potential found not to be involved in growth promotion.

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Stimulation of source-applied¹⁴C-sucrose export inVicia fabaplants by brassinosteroids, GA₃and IAA

Cited by 26 publications

References 29 publications

Effects of homobrassinolide application on plant metabolism and grain yield under irrigated and moisture-stress conditions of two wheat varieties

Effects of homobrassinolide application on plant metabolism and grain yield under irrigated and moisture-stress conditions of two wheat varieties

Brassinolide alleviated the adverse effect of water deficits on photosynthesis and the antioxidant of soybean (Glycine max L.)

Modulation of growth, photosynthetic capacity and water relations in salt stressed wheat plants by exogenously applied 24-epibrassinolide

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