Starch metabolism and end use quality of durum wheat in response to high temperature stress

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dc.contributor.advisorMunjal, Renu
dc.contributor.authorBansal, Kavita
dc.date.accessioned2016-11-22T13:48:54Z
dc.date.available2016-11-22T13:48:54Z
dc.date.issued2007
dc.description.abstractThe present experimentation was carried out on durum wheat to study the physiological and biochemical basis of high temperature induced changes in sucrose to starch conversion. Effect of high temperature stress was determined on grain quality and starch metabolism in two durum wheat varieties WH 896 and WH 912. The investigation involved pot studies under screen house conditions during the year 2005-06. In this study, high temperature was induced by shifting the pots to polyhouse after heading. Heat degree days (HDD) were used to quantity the magnitude of heat stress to which these two durum wheat varieties were exposed during the second half of crop growth i.e. from days of heading (DOH) to days of physiological maturity (DOPM) and it is expressed as sum of daily mean temperature during particular period of crop growth. High temperature decreased functioning of various physiological parameters of the plants such as chlorophyll, chlorophyll fluorescence, chlorophyll stability index, membrane thermostability, osmotic potential and dry matter accumulation in grains. The detrimental effect of high temperature on various grain yield and quality characteristics such as grain shriveling score, grain hardness, grain weight/spike, grain number, test weight (1000-grains weight), β-carotene and total protein were also reflected. However, sedimentation value increased under high temperature treatment. Besides these, biochemical parameters such as total soluble sugars, reducing sugars, non-reducing sugars, protein, sucrose, starch and amylopectin were also reduced under high temperature stress except amylose. The enzymes and metabolites involved in starch biosynthesis also declined under high temperature treatment. Among enzymes, soluble starch synthase activity was reduced maximum as compared to other enzymes activities and among metabolites, ADP-glucose and UDP-glucose reduced maximum than other metabolites under high temperature stress. Results of present experiment show that variety WH 896 is more tolerant to heat stress than WH 912 in manners of various physiological, biochemical and quality characteristics parameters when they were exposed to same degree of high temperature stressen_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86998
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Physiology
dc.subjectHigh temperature, Durum wheat, Starch metabolism, End use qualityen_US
dc.these.typeM.Sc
dc.titleStarch metabolism and end use quality of durum wheat in response to high temperature stressen_US
dc.typeThesisen_US
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