大豆器官间的热能分布与耐旱性的关系初报

采用四个耐旱性不同的大豆品种,在始花期和成熟期分别测定了各器官间热量分布状况。结果表明,不同品种器官间热能分布不同;热能累积速率也不同,耐旱强的品种开花后热能累积速率高。导致干旱减产的重要原因之一,是光合生产捕获的太阳能滞留在茎和荚皮中。热量的垂直分布与籽粒的垂直分布关系表明,抗旱品种的热量分布与籽粒重量分布呈极显著相关,而不抗旱品种则无明显相关关系。

PRELIMINARY STUDY ON RELATIONSHIP BETWEEN THERMAL EMERGY DISTRIBUTION AMONG SOYBEAN ORGANS AND DROUGHT RESISTANCE

The distribution of thermal energy among organs were studied at the early flowering stage and the maturing stage with four varieties having different degree of drought-folerance. The results showed that the thermal energy distribution in different organs were not the same, and the accumulating rates of thermal energy per plant were different between varieties. High drought-tolerant variety had higher rate after the stage of flowering. One important reason of yield reduction resulted from drought was that the energy captured by leaf remained in stem and pod husk. High drought-tolerant variety had a significant (at 0. 01 level) relationship between the vertical distribution of thermal energy and seed weight however, low drought-tolerant variety had no such case relationship.