文献类型： 外文期刊

第一作者： Wang, QC

作者： Wang, QC

作者机构：

关键词： canopy density; defoliation; ear; grain yield; kernel; leaf sheath; photosynthates; soluble sugars

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN： 0300-3604

年卷期： 1996 年 32 卷 2 期

页码：

收录情况： SCI

摘要： The effect of altered source-sink ratio induced by defoliation on canopy photosynthetic rate and other traits was studied in the field. Defoliation treatments consisted of removing (I) no leaves, (2) all leaves above the ear, (3) all leaves below the ear, and (4) all leaves at anthesis stage. Canopy carbon dioxide exchange rates (P-N), yield and its components, and soluble sugar contents of treated plants were measured. The canopy P-N declined following defoliation in the order 4>2>3. Treatments 4, 2, and 3 reduced grain yield per plant by an average of 87, 51 and 34 %, respectively. Percentage of kernel setting and soluble sugar content of plant parts were reduced in leaf removal treatments. The results indicate that photosynthate source plays an important role in grain yield formation. The sink capacity (i.e., the potential of the grain to accommodate assimilates) and source strength (i.e., the ability of the leaf canopy to produce assimilates) are highly interdependent.

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