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Subject: Plant Physiology × Author: Parminder Singh × End date: 2009 × Start date: 2007 ×
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    ThesisItemOpen Access
    Elucidating the potential of different rice (Oryza sativa L.) varieties through photothermic indexing
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2008-01) Parminder Singh; Shukla, Alok
    The present investigation was carried out to evaluate photothermic response of different rice varieties namely Prasanna, Krishna hamsa, Abhya, Jaya, Rasi, Nandi, CSR-10, Yamini, Early samba and Kasturi under early and late sown conditions through field trials. The effects of these treatments were studied on different morpho-physiological and phenological characters (plant height, number of green leaves, days to panicle initiation, days to general flowering, days to maturity, cumulative degree days (CDD), cumulative nyctoperiods (CNP) and relative water content), biochemical characters (chlorophyll content, proline content and protein profiling) and yield parameters (thousand grain weight, biological yield, economic yield and harvest index). Temperature affects plant growth in early stages while nyctoperiod affects plant growth during transition from its vegetative phase to reproductive phase. Number of days to attain panicle initiation was reduced by 3.2 to 7.7 days under late sown conditions as compared to early sown conditions. Average reduction in days to flowering under late sown conditions is primarily due to longer nyctoperiods as compared to early sown conditions. So with the delayed sowing there was a considerable saving of thermal and nyctoperiod requirement with parallel reduction in yield. Protein profiling studies revealed that lower molecular weight protein showed less expression with low intensity bands under early sown conditions as compared to late sown conditions. Molecular studies revealed that rice varieties Rasi and Early samba have highest similarity coefficient of 0.733 followed by rice genotypes pair Yamini-Kasturi with SSR markers. Rice genotypes pair Rasi - Early samba showed highest similarity coefficient of 0.737 followed by rice genotypes pair Kasturi – Krishna hamsa with RAPD markers. High degree of polymorphism was shown by SSR markers as compared to RAPD markers. This study can be explored in selection and incorporation of phenological traits in breeding programmes to give rise better varieties with better yield.