两种不同穗型水稻品种灌浆期间物质生产特性的比较

选用直立穗型水稻品种辽粳326和弯曲穗品种奥羽316，在相同栽培条件下，比较两品种灌浆期间物质生产与分配、群体生长率(CGR)、净同化率(NAR)及与物质生产密切相关的叶绿素含量、叶面积指数(LAI)、比叶重等指标。结果表明，和弯曲穗品种奥羽316相比，直立穗品种辽粳326在灌浆后期仍能保持较强的物质生产能力，其抽穗后生产的干物质量占其生物产量的53．77％，比其经济产量高出12％。灌浆期间，直立穗品种辽粳326的比叶重较高，叶绿素含量较高，LAI下降较慢，各项生理指标优于弯曲穗品种奥羽316.抽穗后，直立穗品种辽粳326具有比弯曲穗品种奥羽316更强的生产能力．因而更符合高产栽培的需要。

CHARACTERISTIC BIOMASS PRODUCTION BETWEEN TWO RICE VARIETIES WITH DIFFERENT PANICLE TYPE DURING GRAIN FILLING STAGE

Two rice varieties with ditferent panicle type,Liaojing 326 and Aoyu316,were selected to study their differences under the same culture condition in the biomass production and their distribution,colony growth rate(CGR),net assimilate rate(NAR)and oter important index which were closely related to biomass production such as chlorophyll content,index of leaf area(LAI)and leaf weight per unit area.The result showed that as compared with Aoyu 316,the rice variety with curved panicle type,Liaojing 326,the rice variety with erect panicle type,has higher material productivity in the later stage of grain filling.The dry matter produced after its heading of Liaojing 326 reached 53.77% of its biological yield and is 12%.higher than its economic yield.During grain filling stage,Liaojing 326 have higher leaf weight per unit area,higher chlorophyll content and slower LAI drop rate than that of Aoyu 316.Each of these physiological indexes of Liaojing 326 is better than that of Aoyu 316.After heading stage Liaojing 326 has higher productivity than that of Aoyu 316,so it more accords with the need of super high yield culture.