Relationship between grain yield and leaf photosynthetic rate in super hybrid rice.

In order to explore the relationship between grain yield and photosynthesis,the yield composition and leaf photosynthetic rate in some super hybrid rices and ordinary hybrid rice‘Shanyou 63’as control were mea- sured in 2000-2005.The results were as follows.(1)The yield levels of the four super hybrid rices,‘Pei'ai 64S/ E32’,‘P88S/0293’,‘Jin23A/611’and‘GD-1S/RB207’, were significantly higher,being 108%-120% of‘Shanyou 63’.(2)These super hybrid rices had a better plant type with more erect upper layer leaves and bigger panicles or more spikelets per panicle,being 125%-177% of‘Shanyou 63’.(3)Net photosynthetic rates of these super hybrid rices were significantly higher in the sec- ond leaf but not necessarily in the first leaf or flag leaf than those of‘Shanou 63’.(4)The removal of half flag leaf led to a decline in the seed-setting rate,while the removal of half panicle induced its increase in‘GD-lS/ RB207’.Hence,higher yield in these super hybrid rices can be attributed to their bigger panicles,better plant type and higher light use efficiency of their canopies.Raising the photosynthetic capacity of each leaf,especially flag leaf,is the key to overcome the photosynthate-source re- striction on grain yield and to make a new breakthrough of yield potential in future breeding of super hybrid rice.