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M. Sc. Dissertations

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20131
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Subject: Plant Physiology × Author: Kirpa Ram × End date: 2013 × Start date: 2013 ×
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    ThesisItemOpen Access
    Photosynthetic rate studies in Indian mustard (B. juncea (L.) Czern & Coss.)
    (CCSHAU, 2013) Kirpa Ram; Munjal, Renu
    The objectives of present investigation were to the study photosynthetic rate of wild and cultivated variety of B. juncea and to compare photosynthetic rate of hybrids with their respective parents. The characters observed were net photosynthetic rate, transpiration rate, stomatal conductance, intracellular CO2 concentration, water use efficiency, mesophyll efficiency, chlorophyll content and seed yield per plant were recorded. Result revealed that average net photosynthetic rate was maximum in 5 th upper leaf, whereas average stomatal conductance was maximum in 3 rd upper leaf and intracellular CO2 concentration at 1 st lower most leaf at 45 (DAS). At varying light interception, net photosynthetic rate and transpiration rate was found maximum at 12:00 PM. However intracellular CO 2 concentration was maximum at 10:00 AM. Intracellular CO2 concentration was found to be positive and significantly correlated with transpiration rate, stomatal conductance and chlorophyll content. Significant differences for photosynthetic traits indicated the ample variability existed among the genotypes. The estimate of heritability were high for the characters- water use efficiency and mesophyll efficiency, whereas low to moderate genetic advance was observed for the characters net photosynthetic rate and chlorophyll content. High heritability coupled with high genetic advance was observed for seed yield per plant and stomatal conductance. The highest mean over parental heterosis was observed in Kranti x RB-50 for transpiration rate (95.18%) and intracellular CO 2 concentration (67.82%). The overall performance of the crosses Kranti x RH-0446, Kranti x RB-50, RH-9304 x RH-8113, RB-50 x RH-9304, RH-0446 x RH-8113 were found promising and may be exploited in future breeding programme in order to improve the photosynthesis and seed yield in mustard.