关键词: 水稻, 穗型, 功能叶, 叶位, 灌浆特性, 强势粒, 弱势粒, 产量, 品质

Abstract: In order to clarify the correlation between functional leaves at different positions and grain‑filling characteristics，yield and quality，Liaojing 401（semi‑erect large panicle rice variety ）and Liaojing 371（curved panicle rice variety）were used as materials，the effects of functional leaves at different positions［cutting flag leaf（T1），cutting second leaf from top（T2），cutting third leaf from top（T3）and no cutting（control，CK）］on the filling characteristics of superior and inferior grains，yield and quality of different panicle types of rice varieties were studied，and the relationship between grain‑filling characteristics and quality indexes was analyzed.The results showed that the absence of flag leaf and second leaf from top significantly decreased the maximum and average filling rate of superior and inferior grains of Liaojing 401 and inferior grains of Liaojing 371.The absence of functional leaves at different positions significantly extended the active filling period of Liaojing 401，and shortened the active filling period of Liaojing 371.The absence of functional leaves at different positions advanced the maximum filling time of Liaojing 401，and delayed the maximum filling time of Liaojing 371.The absence of flag leaf and second leaf from top significantly decreased seed setting rate，grain plumpness and 1 000‑grain weight，and then significantly decreased the yield. The order of effects on the above indexes was flag leaf>second leaf from top>third leaf from top.Compared with CK，1 000‑grain weight of Liaojing 401 and Liaojing 371 of cutting flag leaf treatment decreased by 18.32% and 6.44%，and the yield decreased by 16.52% and 8.05% respectively.With the elevation of cutting leaf position，milling and appearance qualities，breakdown and final viscosity gradually decreased，and the effects on chalkiness and chalky grain percentage were greater.The effect of functional leaves at different positions on yield and quality of curved panicle type of rice variety was smaller than that of semi‑erect large panicle type.In summary，the order of effect of functional leaves at different positions on filling characteristics，yield and quality of rice is flag leaf>second leaf from top>third leaf from to top，and the effect on semi‑erect large panicle type is greater than curved panicle type.

Key words: Rice, Panicle type, Functional leaves, Leaf position, Grain filling characteristic, Superior grains, Inferior grains, Yield, Quality