不同硅浓度对粳稻形态和光合生理机制的影响

目的]为了探究不同硅浓度对粳稻形态和光合生理机制的影响。方法]用不同硅浓度(0、30、80、130、180 mg/L硅酸钠溶液)处理粳稻幼苗。采用钼蓝比色法测定不同硅浓度处理组水稻根、茎、叶的硅含量,使用测量工具测量不同硅浓度处理组水稻株高、根长、根系数目,采用丙酮提取法测定不同硅浓度处理组水稻叶、茎的叶绿素a、b的含量以及叶绿素a/b值。结果]粳稻营养器官中硅含量从高到低依次是茎叶根;当硅浓度为80 mg/L时,粳稻株高最矮;当硅浓度为30 mg/L时,粳稻根长最短,根系数最少;当硅浓度为30mg/L时,叶绿素a、b的含量均最高,且叶绿素a/b值在硅浓度为80 mg/L时达到最大值。结论]适当的硅浓度可提高粳稻的抗倒伏性以及粳稻的光合作用效率,进而提高粳稻产量。

Effects of Silicon in Different Concentrations on Morphology and Photosynthetic Physiological Mechanism of Japonica Rice

Objective] The aim was to explore the effects of silicon in different concentrations on morphology and photosynthetic physiological mechanism of japonica rice.Method] Seedlings of japonica rice were treated with silicon in different concentrations(0,30,80,130 and 180 mg/L).Silicon contents were measured with molybdenum blue spectrophotometric method in root,stem and leaf.Plant height,length and number of root system in different treatment groups were measured with tools.Chlorophyll a and b,and a/b in leaf and stem of rice in different groups were measured.Result] Silicon contents in vegetative organs were as follows: stem>leaf>root.When silicon concentration was at 80 mg/L,plant height of japonica rice was the shortest.When silicon concentration was 30 mg/L,root length of the rice was the shortest and root number was the least.When silicon concentration was 30 mg/L,the contents of chlorophyll a and b were the highest and chlorophyll a/b achieved the peak when silicon concentration was at 80 mg/L.Conclusion] Silicon at proper concentration would improve lodging-resistance and the efficiency of photosynthesis,and enhance the yield of japonica rice.