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Author: Baishya, Navanita × End date: 2018 × Start date: 2018 ×
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    ThesisItemOpen Access
    RESPONSE OF BLACK GRAM GENOTYPES TO PLANT GROWTH REGULATORS UNDER LATE SOWN CONDITIONS
    (AAU, Jorhat, 2018-07) Baishya, Navanita; Kalita, Prakash
    A pot experiment was carried out during the kharif season of 2017 with five black gram genotypes in the stress physiology premises of Department of Crop Physiology, AAU, Jorhat-13. Five black gram genotypes viz., LBG-752, PU-30, PU-40, AZAD URD-3 and LBG-645 were sown at three different dates viz., 15th September (recommended date of sowing i.e. D1), 1st October (15 days delayed beyond recommended date of sowing i.e. D2), and 15th October (30 days delayed beyond recommended date of sowing i.e. D3) and were treated with water spray (control), 50 ppm GA3 and 500 μ mole/lit salicylic acid at 20 DAS and 15 days there after. The objectives of the experiment was to evaluate the physiological performance of black gram genotypes under late sown situation and to examine the influence of some plant growth regulators in improving productivity of black gram genotypes under late sown conditions .Significant variations were recorded due to the genotypes, treatments (plant growth regulators) as well as dates of sowing in terms of various parameters namely leaf area, leaf number, plant height, root volume, root surface area, root length, number of nodules, whole plant biomass, leaf total chlorophyll content, in vivo leaf nitrate reductase activity, lipid peroxidase activity, proline content, number of pods per plant, number of seeds per pod, seed yield and harvest index. The interaction between genotypes and growth regulator treatments was also found to be significant for these traits. The genotypes responded differently towards the dates of sowing for the traits namely leaf area, plant height, root volume, root surface area, whole plant biomass, total chlorophyll content, lipid peroxidase activity, hundred seed weight and seed yield and the interaction among genotypes, plant growth regulators and sowing dates was found to be significant in terms of plant biomass content at harvest. In general, all the traits excepting lipid peroxidase activity exhibited a declining trend with delayed dates of sowing compared to that of recommended date of sowing. The genotype LBG-645 showed the best yield performance followed by AZAD URD-3 when sowing was done in the recommended date as well as in delayed dates. On the other hand, the genotype PU-40 registered the lowest yield performance in both the situations. The GA3 treated plants showed the best performance for most of the traits as compared to salicylic acid treated plants and water spray under all the sowing dates. The combination of LBG-645 with GA3 treatment recorded the best results for most of the traits under all the three dates of sowing. In the case of the recommended date of sowing, the values of seed yield in LBG-645, AZAD URD-3 and PU-40 with GA3 treatment were 12.96 g plant-1, 10.39 g plant-1, 5.96 g plant-1 respectively. With second date of sowing (1st October) the corresponding seed yield values were 11.18 g plant-1, 7.04 g plant-1, 4.75 g plant-1 respectively. When the sowing was done on 15th October, the GA3 treated plants of LBG-645, AZAD URD-3 and PU-40 recorded 8.61 g plant-1, 4.53 g plant-1, 4.51 g plant-1 respectively. The higher values of grain yield in LBG-645 with applied GA3 may be related to its better performance for the traits namely leaf area, root surface area, whole plant biomass, leaf total chlorophyll content, in-vivo leaf nitrate reductase activity and harvest index. From the correlation study also positive and significant correlations were recorded in D1, D2 and D3; between seed yield and leaf area (0.770**, 0.695**, 0.727**), seed yield and root surface area (0.736*, 0.796**, 0.541**), seed yield and whole plant biomass (0.790**, 0.638**, 0.723**), seed yield and total leaf chlorophyll content (0.833**, 0.805**, 0.673**), seed yield and in-vivo leaf nitrate reductase activity (0.813**, 0.784**, 0.705**), seed yield and harvest index (0.983**, 0.083**, 0.987**).