期刊
FUNCTIONAL PLANT BIOLOGY
卷 32, 期 11, 页码 1009-1017出版社
CSIRO PUBLISHING
DOI: 10.1071/FP05154
关键词
Pisum sativum L.; plant C and N assimilate availability; seed filling; seed N concentration; temperature
The effect of moderate temperature on seed N concentration during the seed-filling period was evaluated in pea ( Pisum sativum L.) kept in growth cabinets and the relation between plant assimilate availability and the variation of seed N concentration with temperature was investigated. Seed N concentration of pea was significantly lowered when temperature during the seed-filling period decreased from a day / night temperature of 25 / 20 degrees C to 15 / 10 degrees C. Our results demonstrate that during the seed-filling period mechanisms linked with assimilate availability can modify seed N accumulation rate and / or seed-filling duration between 25 / 20 degrees C and 15 / 10 degrees C. At the lower temperature ( 15 / 10 degrees C), an increased C availability resulting from an enhanced carbon fixation per degree-day allowed new competing vegetative sinks to grow as pea is an indeterminate plant. Consequently N availability to filling seeds was reduced. Because the rate of seed N accumulation per degree-day mainly depends on N availability to filling seeds, the rate of seed N accumulation was lower at the low temperature of our study ( 15 / 10 degrees C) than at 25 / 20 degrees C while seed growth rate per degree-day remains unaffected, consequently seed N concentration was reduced. Concomitantly, the increased C availability at the lower temperature prolonged the duration of the seed-filling period.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据