Studies on physiological and molecular diversity in wheat (Triticum aestivum L.) genotypes for phosphorus efficiency

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dc.contributor.advisorSheokand, Sunita
dc.contributor.authorGera, Gunjan
dc.date.accessioned2017-06-03T04:34:10Z
dc.date.available2017-06-03T04:34:10Z
dc.date.issued2013
dc.description.abstractTwelve wheat genotypes WH147, WH711, WH1021, WH1025, WH1080, WH1081, WH1094, WH1107, WH1111, C306, Lok-1 and PBW343 were evaluated at three P level; 100 %, 50% and 15 % P levels. All growth parameters such as plant height, dry weight, P content, grain growth rate, spike length, number of productive tillers and grain yield decreased at reduced P levels (50 % and 15 %). Total plant biomass was maximum in WH1080 and WH1111 at low P levels. P content in all plant parts decreased with decreasing P levels at all sampling stages. At later growth stages more of P accumulated in reproductive parts. Maximum spike and grain P content was observed in WH1080 and WH147. Minimum decrease in grain yield at 15 % P level was observed in WH147 (16.1 %), WH1080 (20.7 %) and WH1081 (26%). A significant positive correlation of grain yield was observed with total plant biomass (0.88), number of productive tillers (0.75), grain growth rate (0.74) and P content in grain (0.84). Also a delay in heading, anthesis and maturity was observed under P deficiency. C306, WH1081, Lok-1 and WH1080 had minimum delay in heading, anthesis and maturity. Photosynthetic rate, chlorophyll content, transpiration rate and stomatal conductance decreased with decreasing P levels. The genotypes which performed well at low P level were WH1080, WH1094, WH1081 and WH147 and least efficient genotypes were C306 and PBW343. Phosphatase activity (acid phosphatase, alkaline phosphatase and phytase) increased in response to P deficiency. WH1080, WH147 and WH1094 showed greater increase in enzyme activity under long term P deficiency. Genotypes WH1080, WH147, WH1081and WH1094 performed well under short term P deficiency (15 days) in terms of root traits (root length, number of secondary roots and root/shoot ratio). Lok-1 performed better in terms of APase activity and WH1080, WH1025 and WH1094 performed well in terms of alkaline phosphatase and phytase activity. Increased phosphatase activity and proton extrusion in root exudates was also observed under P deficient conditions. Maximum enzyme activity in root exudates was found in WH1107 and WH1080 and maximum exudation of protons was observed in WH1080. On the basis of RAPD - cluster analysis two major groups were formed and these are further divided in four sub groups. The genotypes which exhibited low diversity at phenotypic level also exhibited less genetic diversity at molecular level. On the basis of present investigations WH147 and WH1080 were identified as more P efficient genotypes.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810014924
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Physiology
dc.subjectPlanting, Vegetative propagation, Wheats, Developmental stages, Enzymes, Genotypes, Acidity, Yields, Grain, Inorganic acid saltsen_US
dc.these.typePh.D
dc.titleStudies on physiological and molecular diversity in wheat (Triticum aestivum L.) genotypes for phosphorus efficiencyen_US
dc.typeThesisen_US
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