Physiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under waterstress conditions

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dc.contributor.advisorDr. Navita Ghai
dc.contributor.authorKulveer Kaur
dc.date.accessioned2024-04-02T12:53:00Z
dc.date.available2024-04-02T12:53:00Z
dc.date.issued2024
dc.description.abstractThe scarcity of water is a severe environmental constraint to plant productivity. Water-stress affects wheat growth and development at various stages in its life cycle. The present investigation, entitled "Physiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under water-stress conditions", was carried out during the Rabi seasons 2020-21 and 2021-22 in the experimental area and laboratories of the Department of Botany, Punjab Agricultural University, Ludhiana. The plant material used for the experiment was a disomic substitution line DS5Ut(5A), wheat cultivar Pavon Ph1b mutant, hexaploid wheat cultivar WL711 and 91 chromosomal segment substitution lines (CSSLs) derived from their three-way cross. 91 CSSLs along with parents and relevant checks were sown at the recommended time of sowing under two irrigation regimes (irrigated conditions and rain-fed conditions). The CSSLs, parents and checks varied significantly and were negatively affected by water-stress for traits viz., days to booting, days to heading, days to flowering, days to physiological maturity, awn length, spike length, peduncle length, plant height, spikelets per spike, thousand grain weight, grain weight per spike and grain yield under rain-fed conditions. Genome wide association studies were carried out to detect genomic regions responsible for water-stress tolerance CSSLs which revealed fifty-five highconfident markers associated with stress tolerance for traits studied. The current study suggested that 5U-24, 5U-26 and 5U-27 are water-stress tolerant and also CSSL 5U-26 outperformed check variety PBW725, parent DS5Ut(5A) and other CSSLs by maintaining grain yield besides exhibiting an increase in thousand grain weight under water-stress conditions. In 5U-26, maintenance of water content, canopy temperature depression, increased amounts of compatible solutes (proline, glycine betaine and soluble sugars), decreased cell damage (in terms of malondialdehyde and hydrogen peroxide contents), lower reduction in photosynthetic activity (chlorophyll content, quantum yield of PSII and nonphotochemical quenching) and enhanced stem reserve mobilization might have contributed towards maintenance of grain yield along with increased thousand grain weight under waterstress conditions. Therefore, 5U-26 may act as a potent germplasm donor in future breeding programs to enhance water-stress tolerance in wheat.
dc.identifier.citationKulveer Kaur (2024). Physiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under waterstress conditions (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810208002
dc.language.isoEnglish
dc.pages129
dc.publisherPunjab Agricultural University
dc.research.problemPhysiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under waterstress conditions
dc.subBotany
dc.themePhysiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under waterstress conditions
dc.these.typePh.D
dc.titlePhysiological traits associated with grain weight in 5U/5A wheat chromosomal segment substitution lines under waterstress conditions
dc.typeThesis
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