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Subject: Plant Breeding ×

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    ThesisItemOpen Access
    Evaluation of Fennel (Foeniculum vulgare Mill.) Inbred Lines for Heat Tolerance
    (2022) YADAV, PRIYANKA; Ram Kunwar
    The present investigation entitled as “Evaluation of Fennel (Foeniculum vulgare Mill.) Inbred Lines of fennel for Heat Tolerance” was carried out fifty-seven inbred lines with six check varieties and 3 blocks in augmented design during rabi, 2021-22 to estimate variability, character association, path analysis on seed yield and heat stress indices to screen the genotypes. Analysis of variance indicated significant variability for all the traits studied namely days to 50% flowering, days to maturity, plant height, branches per plant, umbels per plant, umbellets per plant, seeds per umbel, 1000-seed weight, chlorophyll and seed yield per plant. High estimates of PCV along with GCV were observed for umbellets per umbel in timely sown environment and late sown environment. The estimate of heritability was high for characters viz., seeds per umbel, chlorophyll and seed yield per plant in timely sown environment. Whereas, umbellets per umbel, chlorophyll and seeds per umbel in late sown environment. Genetic advance as percentage of mean was high for characters viz., umbellets per umbel under both the conditions. High estimates of PCV, GCV, heritability and genetic advance as percentage of mean was observed for umbellets per umbel in both the conditions. The seed yield per plant had positive and significant association with umbels per plant, umbellets per umbel, seeds per umbel and 1000-seed weight in timely sown environment whereas the seed yield per plant had positive significant correlation with umbels per plant,umbellets per umbel, 1000-seed weight, seeds per umbel, days to maturity and plant height in late sown environment. Path coefficient analysis revealed that umbellets per umbel had high positive direct effect on seed yield followed by umbels per plant and seeds per umbel in timely sown environment and umbellets per umbel, umbels per plant and 1000-seed weight in late sown environment. Based upon the correlation and path coefficient analysis, it was concluded that umbellets per umbel, umbels per plant, seeds per umbel and 1000- seed weight are the most important yield component traits in timely sown environment and late sown environment. The differential responses of genotypes to heat stress condition indicated the stress tolerance ability of genotypes of fennel. On the basis of stress susceptibility indices, seventeen out of fifty seven genotypes were identified as heat stress tolerant inbred lines of fennel for seed yield per plant, lowest SSI value of ILF-68, ILF-46, ILF-43, ILF 35, ILF-68, ILF-46, ILF-51, ILF-50, ILF-53, ILF-57, ILF-48, ILF-33, ILF 48, ILF-28, ILF-26 and ILF-4, whereas ILF-29 showed high SSI value followed by ILF-44, ILF-40, ILF-39, ILF-54, ILF-31, ILF-67, ILF-18, ILF 47, ILF-20 and ILF-22 which implies that it is highly susceptible to heat stress. Stress tolerance (TOL) indicates the high stress tolerance ability of inbred lines. Lower TOL values indicate the lower differences in yield between timely sown environment and late sown environment, in other words high tolerance to heat stress. With respect to 9 out of 57 inbred lines were the top performer for heat stress ILF-68, ILF-46, ILF-43, ILF 35, ILF-30, ILF-60, ILF-52, ILF-36 and ILF-28. Based upon the mean seed yield, SSI and TOL the inbreds viz., ILF-68, ILF-46, ILF-43, ILF- 35, ILF-30, ILF-60, ILF-52, ILF-36, ILF-28 were found tolerant under late sown environment. Hence, these inbreds may be used in heat stress breeding programmes. On the basis of stress intensity most affected trait is umbels per plant followed by seeds per umbel, chlorophyll, days to 50% flowering, days to maturity, plant height, umbellets per umbel, 1000-seed weight, branches per plant and yield per plant
  • Thumbnail Image
    ThesisItemOpen Access
    Evaluation of Fennel (Foeniculum vulgare Mill.) Inbred Lines for Heat Tolerance
    (2022) YADAV, PRIYANKA; Ram Kunwar
    ABSTRACT The present investigation entitled as “Evaluation of Fennel (Foeniculum vulgare Mill.) Inbred Lines of fennel for Heat Tolerance” was carried out fifty-seven inbred lines with six check varieties and 3 blocks in augmented design during rabi, 2021-22 to estimate variability, character association, path analysis on seed yield and heat stress indices to screen the genotypes. Analysis of variance indicated significant variability for all the traits studied namely days to 50% flowering, days to maturity, plant height, branches per plant, umbels per plant, umbellets per plant, seeds per umbel, 1000-seed weight, chlorophyll and seed yield per plant. High estimates of PCV along with GCV were observed for umbellets per umbel in timely sown environment and late sown environment. The estimate of heritability was high for characters viz., seeds per umbel, chlorophyll and seed yield per plant in timely sown environment. Whereas, umbellets per umbel, chlorophyll and seeds per umbel in late sown environment. Genetic advance as percentage of mean was high for characters viz., umbellets per umbel under both the conditions. High estimates of PCV, GCV, heritability and genetic advance as percentage of mean was observed for umbellets per umbel in both the conditions. The seed yield per plant had positive and significant association with umbels per plant, umbellets per umbel, seeds per umbel and 1000-seed weight in timely sown environment whereas the seed yield per plant had positive significant correlation with umbels per plant,umbellets per umbel, 1000-seed weight, seeds per umbel, days to maturity and plant height in late sown environment. Path coefficient analysis revealed that umbellets per umbel had high positive direct effect on seed yield followed by umbels per plant and seeds per umbel in timely sown environment and umbellets per umbel, umbels per plant and 1000-seed weight in late sown environment. Based upon the correlation and path coefficient analysis, it was concluded that umbellets per umbel, umbels per plant, seeds per umbel and 1000-seed weight are the most important yield component traits in timely sown environment and late sown environment. The differential responses of genotypes to heat stress condition indicated the stress tolerance ability of genotypes of fennel. On the basis of stress susceptibility indices, seventeen out of fifty seven genotypes were identified as heat stress tolerant inbred lines of fennel for seed yield per plant, lowest SSI value of ILF-68, ILF-46, ILF-43, ILF-35, ILF-68, ILF-46, ILF-51, ILF-50, ILF-53, ILF-57, ILF-48, ILF-33, ILF-48, ILF-28, ILF-26 and ILF-4, whereas ILF-29 showed high SSI value followed by ILF-44, ILF-40, ILF-39, ILF-54, ILF-31, ILF-67, ILF-18, ILF-47, ILF-20 and ILF-22 which implies that it is highly susceptible to heat stress. Stress tolerance (TOL) indicates the high stress tolerance ability of inbred lines. Lower TOL values indicate the lower differences in yield between timely sown environment and late sown environment, in other words high tolerance to heat stress. With respect to 9 out of 57 inbred lines were the top performer for heat stress ILF-68, ILF-46, ILF-43, ILF- 35, ILF-30, ILF-60, ILF-52, ILF-36 and ILF-28. Based upon the mean seed yield, SSI and TOL the inbreds viz., ILF-68, ILF-46, ILF-43, ILF- 35, ILF-30, ILF-60, ILF-52, ILF-36, ILF-28 were found tolerant under late sown environment. Hence, these inbreds may be used in heat stress breeding programmes. On the basis of stress intensity most affected trait is umbels per plant followed by seeds per umbel, chlorophyll, days to 50% flowering, days to maturity, plant height, umbellets per umbel, 1000-seed weight, branches per plant and yield per plant.