干旱地区农业研究Issue(4)：30-36,7.
水分胁迫对线辣椒根系生长及产量的影响
Effects of water stress on root growth and yield of line pepper
摘要
Abstract
With the two varieties Duojiao and Xinxiang No .8 that were widely planted in Central Shaanxi in China as test materials ,a pot experiment was conducted to study the effects of water stress on morphological development of roots and yield of line pepper .There were 5 water treatments ,i .e .,T1 (RWC 40% ~50% ) ,T2 (RWC 50% ~60% ) ,T3 (RWC 60% ~70% ) ,T4 (RWC 70% ~80% ) and CK (RWC 80% ~90% ) .The total root length per plant ,root volume ,root surface area ,number of root tips ,number of root crosses ,number of root branches ,average root diameter ,root/shoot ratio ,fruit number and yield per plant were measured .The results showed that the growth rate of total root length ,root volume ,root surface area ,number of root tips ,number of root crosses and number of root branches per plant was decreased or even became negative during the 20th~40th days after water stress ,which was thought to be the most sensitive period of pepper roots to water stress .Among the different treatments ,the total root length ,root vol-ume ,root surface area ,number of root tips ,number of root crosses and number of root branches per plant performed as :CK>T4>T3>T2>T1 .T1 and T2 inhibited the growth of roots significantly during the whole period of water stress , while T3 and T4 did mainly during the 20th~40th days after water stress .During the whole period of stress ,the root/shoot ratio and average root diameter under all water stress treatments were greater than that under the control .This indi-cated that the absorbed water was preferentially utilized to ensure the growth of roots under water stress ,and the stress treatments were not conducive to the growth of fine roots and the appearance of lateral roots .The fruit number and yield per plant decreased with the reduction of soil moisture content .Under water stress treatments ,the inhibition degree of root growth and the decrease rate of yield per plant in Xinxiang No .8 were larger than that in Duojiao , therefore the drought tolerance of Xinxiang No .8 was less than that of Duojiao .关键词
水分胁迫/线辣椒/根系生长/产量Key words
water stress/line pepper/root growth/yield分类
农业科技引用本文复制引用
聂伟燕,赵尊练,夏云飞,房清鹏,胡建超,郭长美,史联联,徐乃林,郭建伟..水分胁迫对线辣椒根系生长及产量的影响[J].干旱地区农业研究,2014,(4):30-36,7.基金项目
农业部公益性行业科研专项“干制辣椒品种优化及安全高效生产关键技术研究与示范” （）
