To improve the yield of sweet peppers in Japan, we investigated the relationships between plant growth characteristics and fruit yield, with a particular focus on dry matter production. Fruit fresh weight (i.e., fruit yield) was highly correlated with fruit dry weight. Aboveground dry matter production was correlated with both light use efficiency and intercepted photosynthetically active radiation. Although the number of fruits was correlated with the fruit set ratio, no correlation was found between the number of fruit and fraction of dry matter distributed to fruit. The correlation between the fraction of dry matter partitioned to fruit and fruit dry weight varied by plant stage, potentially due to the yield fluctuation called “flush”. Together, these findings suggest that to improve the yield of sweet peppers in Japan, we should focus first on improving light use efficiency.

为了提高日本甜椒的产量，我们调查了植物生长特征与果实产量之间的关系，特别关注干物质生产。果实鲜重（即果实产量）与果实干重高度相关。地上干物质产量与光利用效率和截获的光合有效辐射相关。尽管果实数量与坐果率相关，但果实数量与分配给果实的干物质比例之间没有相关性。分配给果实的干物质比例与果实干重之间的相关性因植物阶段而异，这可能是由于称为“冲洗”的产量波动所致。总之，这些发现表明，为了提高日本甜椒的产量，