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Studies on leaf senescence of hybrid rice at flowering and grain formation stage

Acta Phytophysiologica Sinica 23(2): 139-144
Studies on leaf senescence of hybrid rice at flowering and grain formation stage
After sink/source ratio was altered by clipping part of spike and/or leaves of hybrid rice combination at flowering stage, some physiological and biochemical indices and seed setting percentage were determined. The results indicate that: in comparison with conventional rice, hybrid rice has a larger gap between the demand of the sink and the supply by the source and faster rate of leaf senescence (Fig. 1, 4). However, the ratio between the number of grains and flag leaf area is not always higher in hybrid rice (Table 2). Reducing sink/source ratio significantly delayed hybrid rice senescence as indicated by higher chlorophyll and protein levels (Fig. 2) and lower malondialdehyde (MDA) content in leaf (Fig. 5) and higher ratio of Chl contents between the 3rd, 4th, 5th leaf from top and the flag leaf (Fig. 3) compared with the controls. The above results indicate that hybrid rice leaf senescence is related with sink/source ratio.

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Accession: 003283903

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