콩의 同化器官과 受容器官의 能力評價

Improvement in potential crop yield could be achieved through either the improvement of source potential or sink capacity, but preferably both simultaneously. The field experiment was performed to evaluate the genotypic difference in partitioning of dry matter into each plant part in response to photosynthetic manipulation as well as to assess whether the soybean yield is source or sink-limited. Four soybean genotypes, which were “Baekunkong”, “Suwon 168”, and two local soybeans with black seed coat (hereafter referred to as the “black soybean”, “Kangleungjarae” and “Keumleungjarae”, were grown in four different environments in which one or two layers of shading net during grain filling and two different planting densities(55,000 and 110,000 plants ha -1 ) were applied to manipulate photosynthesis. Significant effects of genotype(G), photosynthetic manipulation (P), and G*P were shown in top and grain dry weight. Relative grain to top dry weight was the lowest in soybean plants grown at 110,000 plants ha -1 and covered with two layers of shading net during grain filling. Evaluation of dynamic changes in shoot harvest index in response to photosynthetic manipulation treatments revealed that sink was more limited in local black soybeans than Suwon 168 and Baekunkong, indicating that the availability of photosynthate during grain filling did not limit the grain yield in local black soybeans when compared to Baekunkong and Suwon 168.