Genetic variability for chlorophyll stability and its association with grain growth under normal and late sown conditions in wheat

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dc.contributor.advisorChhabra, Ashok K.
dc.contributor.authorBaral, Sagari
dc.date.accessioned2016-11-17T14:45:48Z
dc.date.available2016-11-17T14:45:48Z
dc.date.issued2009
dc.description.abstractLarge proportion of wheat in India is planted after the first week of December (late sown) that warms up towards the grain filling stage of the crop there by leading to significant yield losses due to heat and water stress created by increased temperatures. High temperature has a significant effect on cellular processes, growth development and economic yield of wheat plants. In such situations, wheat genotypes which could sustain grain growth over longer post anthesis span or further deposition of carbohydrates in grain sink would prove promising. So, to sustain wheat productivity, research emphasis has been given to develop genotypes which could remain staygreen along with larger leaf area and high relative water content so that they can carry out photosynthesis for a longer period as compared to the normal senescent cultivars and thereby enhancing yield through higher grain growth rate even after 3-4 weeks after anthesis. Genetic analysis of grain yield and its components were conducted on twenty four elite genotypes of wheat. The material was grown in randomized block design with three replications at CCS Haryana Agricultural University, Hisar, Research Farm under two natural photothermal environments created through alteration of dates of sowing i.e. 13th November 2007 and 3rd January 2008. Beside field experiments, lab experiment on chlorophyll estimation, AGPase enzyme activity and RAPD markers were also conducted. Under field experiment, relationships of some morphophysiological traits and Grain Growth Rate were examined. Our data showed significant variations among wheat genotypes under different dates of sowing for their character expression, particularly days to flowering, grain growth, biomass, grain yield staygreen. Delayed leaf senescence, leaf area, showed significant positive correlation with yield under normal sown conditions and GGR3, and days to flowering in late sown condition. Among the other traits, grains per spike, harvest index and biological yield were also found to be associated with yield under heat stress conditions. Two genotypes WH1057 and DBW16 expressed staygreen trait. Their chlorophyll content and grain growth rate (GGR3) was higher in late sown conditions as compared to other genotypes. AGPase enzyme was being assayed to determine relationship between staygreen and grain development in normal and late planting. These genotypes could be used as candidate ‘plants’ for isolating genes governing delayed monocarpic senescence. However, the staygreen character can be transferred to genotypes having fast growth so that their early senescence in rainfed and late sown conditions may be avoided and sustained growth could be achieved by combining staygreen post anthesis translocation of carbohydrates to grain sinks.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86108
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Breeding
dc.subjectWheat, Staygreen, Grain growth, Photosynthesis, Chlorophyll, Senescenceen_US
dc.these.typeM.Sc
dc.titleGenetic variability for chlorophyll stability and its association with grain growth under normal and late sown conditions in wheaten_US
dc.typeThesisen_US
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