Indian Society of Genetics & Plant Breeding
Beyond a certain panicle number perunit area, further increase in rice yield would depend
on increase in mean panicle yield. To identify panicle yield characters 18 elite, early
maturing, semidwarf rice varieties were grown under high fertility (Ntoo:Pso:Kso) and low
fertility (Nso:P2s:K25) levels. Results from stepwise regression analysis showed that the
numberof spikelets per panicle was the mostimportant determinant of panicle yield which
accounted 65% and 45% of the total variation in panicle yield under high and low fertility
levels, respectively. The number of sterile spikeletslprimary branch and 1000-grain weight
were next in order of importance. Together, these three characters accounted 82% and 86%
of the total variation in panicle yield at high and low fertility levels, respectively. Thus, if
selection for panicle yield is to be based on spikelet number/panicle alone, high fertility
should be preferred. However, for maximum gains, selection should be based on increased
number of spikelets/panicle, reduced number of sterile spikelets/primary branch, and
higher l000-grain weight. If selection for panicle yield is based on all these three
determinants of panicle yield, the fertility levels would make little difference in the
effectiveness of selection.
Keywords: Correlation, fertility, panide yield, rice, stepwise regression.
Year: 1991
Volume: 51
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
M. P. JANORIA, A. M. RHODES AND M. N. SHRIVASTAVA info_circle
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