Physiological aspects of seasonal variation of spikelet number in early maturing IR cultivars
1988
Parao, F.T. | Laza, R.C. | Akita, S. (International Rice Research Inst., Los Banos, Laguna (Philippines). Dept. of Plant Physiology)
The seasonal variation in spikelet number of IR58 and IR64, two early maturing cultivars, and the factors associated with it were studied through a monthly planting experiment conducted at IRRI [International Rice Research Institute, Los Banos, Laguna, Philippines] field. The number of spikelets per unit area of a rice cultivar differed from one transplanting month to the other. Differing also according to the month of planting was the ratio of dark respiration to nitrogen content (R/N) when determined at panicle initiation period. In months R/N was high, spikelet numbers also tend to be high. A close association was observed between spikelet number and the product of R/N and solar radiation at reproductive stage. R/N value around panicle initiation stage could be a good criteria for screening high sink formation efficiency in rice cultivars.
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