海岛棉盛铃期不同节位光合源叶比叶重变异的比较

Comparative Studies on the Specific Leaf Weight of Photosynthetic-source leaf in Different Nodes of Zero - fruit- branch Seaisland Cotton Varieties at Bolling Stage

在 9个零式果枝海岛棉品种的盛铃期测定了 8～ 1 9节位主茎叶、苞叶、混生有限短果枝叶的比叶重 ,并作显著性检测和相关分析。结果表明 :各品种各节位的比叶重 (SLW ,g·m-2 )混生限短果枝叶 (79.42 ) >主茎叶 (75 .2 4) >苞叶(5 0 .0 8) ;各节位源叶SLW呈现自下而上、由内向外而递增的动态分布规律 ;所测源叶SLW在供试品种间和节位间存在极显著的差异性 ;1 0～ 1 9节位叶片的SLW、1 0～ 1 2、1 4～ 1 6节位苞叶的SLW分别与各节位相应的叶片、苞叶SLW平均值呈显著正相关 ;

Specific leaf weight (SLW) of main stem leaves, bracts and limited-short-branch leaves from 8～19th nodes 9 zero- fruit- branch seaisland cotton (Gossypium barbadense L.) varietes was studied in the paper. The results showed that: whether different varieties or different nodes, the SLW of limited-short-branch leaf was highest(79.42gDW.m-2) , SLW of bractwas lowest (50.08gDW.m-2) and SLW of main stem leaf was middle ( 75.24gDW.m-2). SLW of photosynthetic-source leaf among different nodes increased from lower nodes to higher nodes, from inner canopy to outer canopy. SLW of photosynthetic-source leaf among different varieties and different nodes showed significant differences ( < 1%～0.1%level) . SLW of main stem leaves at 10～19th nodes and SLW of bracts at 10～12th,14～16th nodes had significantly positive correlation with its total mean value of all leaves and bracts(<5%～0.1%level).similarity coefficient of SLW were different in different nodes main stem leaves, bracts and limited-short-branch leaves among different varieties.