不同叶片卷曲度杂交水稻的光合特性比较

Comparison of Leaf Photosynthetic Characteristics among Rice Hybrids with Different Leaf Rolling Index

在田间条件下研究了叶片卷曲度不同的 6个代表性杂交水稻组合在开花期和花后 2 0天上部 3张叶片的卷曲度和剑叶叶片近轴面 (上表面 )、远轴面 (下表面 )光合强度、叶片角度、挺直度、群体消光系数的关系。结果表明 ,剑叶卷曲度高的组合叶片卷曲度达 4 4 %～ 4 7% ,中等的组合为 15%～ 16% ,低的组合为 10 %～ 11%。高叶片卷曲度组合的剑叶上表面 ,由于受自身叶片遮光的影响而使光合强度低于下表面 ,下表面与上表面光合强度比为 1.19～ 1.32 ,中等叶片卷曲度组合为 0 .90～ 1.0 2 ,低叶片卷曲度组合为 0 .82～ 0 .85。与叶片卷曲度低的组合相比 ,叶片卷曲度高和中等的组合具有较小的叶片角度、较高的叶片挺直度和较低的消光系数。

Leaf rolling index(LRI), photosynthesis in adaxial (upper) and abaxial (lower) leaf surface, leaf angle, leaf erecting index and light extinction coefficient of 6 rice hybrids were investigated at the flowering and the 20 days after flowering in field conditions. The LRI of flag leaf reached 44%～47% in hybrids 65396 and Peiai64s/Zhangchao 123, and that only 10%～11% in hybrids Ⅱyou 162 and Shanyou 63. The photosynthesis ratio of abaxial to adaxial surface of flag leaves with higher LRI ranged from 1.19 to 1.32, and that with low LRI only from 0.82 to 0.85. The hybrids with higher and medium LRI had smaller leaf angle, higher leaf erecting index and low light extinction coefficient. LRI and its importance for super high yielding rice breeding was also discussed.