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PHYSIOLOGICAL FACTORS FOR HIGH PROPORTION OF EMPTY- UNFILLED GRAINS IN TWO- LINE INTERSUB SPECIES HYBRID RICE

Lu Xiangyang;Kuang Fengchun;Li Xiankun;Xiao Fu'e;Luo Zemin, (Department of Basic Sciences, HNAC, Changsha, 410128)  
Compared with three-line hybrid rice, two-line intersubspecieshybrid rice (TLIHR) has more grains per ear and a higher proportion of empty-unfilled grains (EUG). Degrees of grain plumpness vary with the TLIHRcombinations. Combinations with stronger carborn assimilation ability, slowersenscence speed and smaller sink capacity have lower proportion of EUG. It issuggested that big capacity with source shortage was one of the main physiologi-cal factors for the higher EUG proportion of TLIHR. Measures of improvingsource, flow and sink relationship are discussed.
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