Endogenous phytohormones after pruning in three mango cultivars planted under high density
2009
Singh, S.K. | Singh, S.K. | Sharma, R.R.
In both biennial and regular bearing mango cultivars, there was significant effect of pruning on the level of endogenous hormones in shoot buds. The higher IAA, ABA and lower GAs were found in 'on' year of mango shoots. The IAA was highest in Mallika (4.57, 4.62 flg gol fw) while highest ABA (0.52, 0.55 flg g-l fw) and lowest IAA (0.297, 0.310 flg g-l fw) were recorded in Amrapali. Shoot-tip pruning removes the source of apical dominance and stimulate axillary bud development. Moderately pruned trees did show highest IAA and moderately pruned Mallika had the highest (4.63, 4.70 ug g-1fw) while lowest was in un-pruned Amrapali trees. The lowest ABA (0.14, 0.09 flg g-l fw) and highest GA like substances (1.36, 1.31 flg g-l fw) were found in the buds of Dashehari while lowest level of GA.Iike substances (0.78, 0.75 flg g-l fw) were estimated in Amrapali. The control trees had the lowest IAA and the highest GA-like substances while lowest level of GA-like substances was in moderately pruned trees. The un-pruned Dashehari trees had the highest GA-like substances while lowest was found in light pruned Mallika. Light pruned Amrapali showed higher ABA while the lowest was estimated in moderately pruned Dashehari.
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