Breeding for drought resistance in crops: physiological approaches.

Book Title: NA
Year Published: 2006
Month Published: NA
Author: Patil, R. V. ; Khanna-Chopra, R.
Book Group Author: NA
Abstract:

Drought is the most important abiotic stress affecting crop productivity. Genetic increases in wheat yields in dry areas have been much less than those in favourable environments where irrigation is available. Since drought can also be a problem in favourable environments, breeding for drought resistance is an important objective in national and international institutes. Drought stress being variable in nature, the empirical methods of breeding have been highly unsuccessful. The analytical approach wherein traits are identified depending upon the description and quantification of drought stress may be more rewarding. The present review highlights the current status with respect to some physiological traits such as cell membrane stability (CMS), canopy temperature depression (CTD), osmotic adjustment and water use efficiency with emphasis on wheat. Drought resistance being a quantitative trait, use of molecular markers for drought resistance traits needs to be encouraged and explored. The review also describes our experience in combining drought resistance with high yield in wheat by crossing a drought-resistant wheat cultivar C306 with high yielding cultivar WL711. The necrosis barrier was overcome using ear culture technique. The surviving F2 population showed recombination of morpho-physiological traits. The successive generations were subjected to water variable environments and characterized for physiological, phenological and yield traits. Six selections with desirable morpho-physiological traits and drought resistance have been deposited as drought-resistant genetic stocks in gene bank in NBPGR, New Delhi.

Pages: 29 - 49
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20073017732&site=ehost-live
Volume: 33
Number: 1/2
Journal: Journal of Plant Biology
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 0972-3862
DOI: NA
Keywords:

canopy, cell membranes, crop yield, drought, droughtresistance, phenology, plant breeding, plant morphology, plantphysiology, plant water relations, reviews, temperature, water stress,water use efficiency, wheat, Triticum, Triticum aestivum, Triticum,Poaceae, Cyperales, monocotyledons, angiosperms, Spermatophyta, plants,eukaryotes, drought tolerance, leaf canopy, Field Crops (FF005) (NewMarch 2000), Plant Breeding and Genetics (FF020), Plant Morphology andStructure (FF030), Plant Physiology and Biochemistry (FF060), PlantWater Relations (FF062), Plant Production (FF100), EnvironmentalTolerance of Plants (FF900)

Source: EBSCO
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