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利用放射性（１４ＣＯ２）示踪技术对两系亚种间杂交稻光合产物分配与籽粒充实度的关系进行了研究。结果表明，齐穗后３０ｄ测定，２８９２Ｓ／Ｍｓｉｎｃｈｕ５３（Ｆ１）１４Ｃ光合产物向籽粒运转分配的比率较亲本Ｍｓｉｎｃｈｕ５３（♂）低１１９９％；滞留于茎鞘、叶和枝梗的比率较亲本高４倍左右，是该杂交组合籽粒充实度差的原因之一。库源比高结实率低，源的供应不足，是该杂交组合籽粒充实度差的另一原因。在源库之间物质运转效率不高，库源流不协调，库容量未能及时得到满足，影响籽粒干物质积累，也是该杂交组合籽粒充实度差的原因。２８９２Ｓ／花广５４９（Ｆ１）、２８９２Ｓ／１６１１（Ｆ１）与各自亲本花广５４９（♂）、１６１１（♂）相比，１４Ｃ光合产物向籽粒运转分配的比率较高，库源流协调性好，籽粒较充实，空秕率较低。
The relationship between the distribution of photosynthate and grain filling degree of two-line intersubspecific hybrid rice was studied by radioactive (14CO2) tracing technique. The results showed that the ratio of photosynthate of 2892S / Msinchu53 (F1) 14C to grain was 1199% lower than that of the parent Msinchu53 (♂) at 30 days after heading, and the ratio of stalk to sheath, leaf and branch stalk was higher than that of the parents This is one of the reasons for the poor seedability of the hybrids. The low seed set rate and high supply of source were the other reasons for the poor seedability of the hybrid combinations. In the source library, the efficiency of material operation is not high, the library source flow is not coordinated, and the library capacity can not be satisfied in time, affecting the dry matter accumulation of the grain, which is also the reason of poor grain filling degree of the hybrid combination. 2892S / Huanghuang 549 (F1), 2892S / 1611 (F1) had a higher rate of 14C photosynthetic products distribution to grain than that of their respective parents Huanghuang 549 (♂) and 1611 (♂) More full-grain, empty rate is lower.