Biochemical and molecular characterisation of exogenous cytokinin application on grain filling in rice.

Hence, it is possible that highly significant accelerating effect of CK treatment on the expression of CDKs and CYCs in apical and basal spikelets, particularly on 12 DAA in the basal spikelets (Fig. 4b ), might be causing an enhanced division of endosperm cell in them during the period leading to significant increase in grain filling (Table 1 ).

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The basal spikelets showed a trend of increase in expression of CDKs and CYCs from 6 to 12 DAA upon cytokinin treatment in contrast to the apical spikelets.

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