Journal of FARM SCIENCES, Vol 31, No 1 (2018)

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Comparative assessment of sunflower (Helianthus annuus L.) genotypes for yield and yield attributing traits under two different temperature regimes



Sunflower is one of the important oil seed crops of India and it has contributed to rapid growth in oilseedproduction. Sunflower oil contains 70-80% poly unsaturated (PUFA) viz, Linoleic acid, oleic acid and vitamin E. On theaspect of global warming, temperature is increasing at very rapid rate. High-temperature stress affects all growth stages ofthe sunflower crop and ultimately yields. High temperature predominantly reduces the leaf expansion and duration ofreproductive growth, since the seed filling period is very sensitive. Management options for high temperature stress arefew. Hence developing intrinsically tolerant plants is essential to combat the situation. In the present study sunflowergenotypes were screened at laboratory for TIR, pollen studies and evaluated for yield and its attributing traits under twodifferent temperature locations. Its mainly because in order to study their performance under varied temperature conditions.The results revealed a significant genetic variability among the sunflower genotypes assessed and by using TIR techniquegenotypes like CMS-17A, CMS-234B, RHA 95-C-1 and KBSH-44 were identified as temperature tolerant. The maximumpollen germination per cent at 400C was shown by KBSH-44,234-B and EC-734826.Wide range of variability was observedfor the traits like days to 50% flowering, plant height, head diameter, stem diameter, seed yield/plant, 100 seed weight andseed set percentage. The genotypes which exhibited tolerance to temperature stress through TIR and gametophyte selectionwere also found tolerant under field conditions.

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