Rice breeding for ideal plant morphology is in effect the breeding for high lightutilization. Thus, its theoretical basis is inevitably to both the genetic and physiologicalaspects of knowledge. The varietal difference in specific leaf weight and chlorophyllcontent, which are regarded as the essential elements of leaf quality, is quite significant,especially the former seems to be more stable than the latter and more consistent underdifferent conditions. Besides, there is significant positive correlation between specificleaf weight and chlorophyll content, each of them is positively correlated with leaf nitrogen content to be highly significant, and the latter in turn is positively correlated withnet photosynthetic rate to be highly significant too. Leaf area, specific leaf weightand chlorophyll content are highly related to well-filled grains per panicle and to theaverage panicle weight, with the order leaf area > specific leaf weight > chlorophyll contentin the degree of relationship. Among these, the direct effect of specific leaf weight inrelation to panicle weight is comparatively more marked, and that of chlorophyll contentmay become more and more important with respect to dry matter production in the laterstage of growth. Therefore, in rice breeding for ideal plant morphology, in particularfor maximal sunlight utilization, while leaf area is to be firstly considered, attentionshould also be paid to specific leaf weight and chlorophyll content. Since estimation ofleaf area, specific leaf weight and chlorophyll content is rather easy to handle, whichcan be done either by eye (for leaf area and chlorophyll content) or by hand touching,this method is of practical importance in screening so large progeny as in rice breeding.
Zhang Longbu,Chen Wenfu,Yang Shouren. The Throry and Method of Rice Breeding for Ideal Plant Morphology: Part II. Varietal difference in leaf quality in relation to yield components[J]. , 1987, 1(3): 144-154 .