关键词: 水稻, 超高产, 光合作用

Abstract: The morphological features and photosynthetic characteristics of 7 hybrid rice combinations with different canopy structure and super high-yielding potential were studied in comparison with Shanyou 63.The results showed that 4 combinations having significant increase in grain weight per plant compared with Shanyou 63 have advantages including (1) a smaller light extinction coefficient resulted from the more erect leaf blades and longer flag leaves enhanced the capacity of source supply on the basis of significant increase of sink demand (i.e. spikelets per panicle), (2) a higher rate of canopy photosynthesis during grain filling and higher rates of flag leaf photosynthesis at saturating light intensity during different stages (i.e. booting stage,10 days after heading, 30days after heading), (3) More dry matter accumulated in stems and sheaths before heading and translated to grains after flowering efficiently.

Key words: Rice, Super high-yielding, Photosynthesis