Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi-110012
* Present address: Cuulong Delta Rice Research institute, OMON, Hau Giang Province, Vietnam.
Grain yield was positively correlated with post-flowering total dry matter production (PFTDM), grain number/m2, sink size and leaf area duration during grain filling while it was negatively correlated with leaf area index (LAI) and TDM at flowering. In high yielding cultivars namely, Jaya and Pusa-743 large sink size was due to higher number of grains/m2, increased panicle weight, more number of spikelets on primary branches and higher number of primary branches. Larger sink size triggered enhanced canopy photosynthesis which resulted in better PFTDM, more number of high density grain (HDG) and higher grain yield.
