Physiological aspects of drought tolerance in clusterbean and strategies for yield improvement under arid conditions.

Book Title: NA
Year Published: 2005
Month Published: NA
Author: Garg, B. K. ; Burman, U. ; Kathju, S.
Book Group Author: NA
Abstract:

Cluster bean (Cyamopsis tetragonoloba), one of the major kharif crops of drylands grown for vegetable, cattle feed, green manure, fodder and various industrial uses because of the occurrence of gum in its endosperm, has been found to be fairly drought tolerant. Significant genotypic differences to water stress at the germination and other growth stages indicate the prospects of further improvement of its drought tolerance capacity. Early genotypes of cluster bean performed better under low rainfall conditions while late genotypes outyielded the early types under good rainfall conditions. However, planting early and late genotypes in 1:1 ratio in alternate rows was the most appropriate for obtaining sustainable yields under diverse rainfall situations. Maintenance of adequate potassium in soil improved plant water relations, photosynthesis and yield of cluster bean under simulated water stress at different developmental stages. Furthermore, seed treatment with 500 ppm thiourea followed by foliar spray (1000 ppm) at 25 and 40 days after sowing significantly alleviated the detrimental effects of field drought on seed yield, dry matter production and water use efficiency of cluster bean. Favourable influence of thiourea was mediated through significant and positive effects on net photosynthetic rate, levels of various leaf metabolites and nitrate reductase activity. Further studies on interactive effects of P and thiourea application indicated that adverse effects of drought could be significantly mellowed by adequate phosphorus nutrition in combination with thiourea application due to their favourable effects on leaf area development, photosynthetic efficiency and nitrogen metabolism.

Pages: 61 - 66
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20063195989&site=ehost-live
Volume: 2
Number: 1
Journal: Journal of Arid Legumes
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 0973-0907
DOI: NA
Keywords:

arid zones, cluster beans, crop yield, drought, droughtresistance, dry matter, dry matter accumulation, enzyme activity,enzymes, genotypes, guar, leaves, metabolites, nitrate reductase,nitrogen metabolism, phosphorus, phosphorus fertilizers, photosynthesis,plant nutrition, plant water relations, potassium, seeds, stress, stressresponse, thiourea, water stress, water use, water use efficiency,India, Cyamopsis tetragonoloba, Cyamopsis, Papilionoideae, Fabaceae,Fabales, dicotyledons, angiosperms, Spermatophyta, plants, eukaryotes,South Asia, Asia, Developing Countries, Commonwealth of Nations, aridregions, carbon assimilation, carbon dioxide fixation, droughttolerance, phosphate fertilizers, Field Crops (FF005) (New March 2000),Plant Breeding and Genetics (FF020), Plant Physiology and Biochemistry(FF060), Plant Nutrition (FF061), Plant Water Relations (FF062), PlantProduction (FF100), Environmental Tolerance of Plants (FF900)

Source: EBSCO
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