摘要
为明确UV-B辐射增强对大豆生物量、叶绿素含量以及光合特性的影响,在田间条件下模拟UV-B辐射增强,对大豆相关指标进行了测定与分析。结果表明:UV-B辐射增强对大豆生长具有抑制作用,花期株高、干质量分别降低21.8%、77.0%,鼓粒期分别降低18.9%、20.8%;总体使大豆叶片的类黄酮、MDA含量增加,其中分枝期分别增加61.7%、35.2%,花期分别增加28.9%、37.4%,鼓粒期二者增加均不显著;使大豆分枝期、花期和鼓粒期的净光合速率分别降低23.2%、35.9%和20.8%,气孔导度降低,胞间CO_2浓度升高;对叶绿素含量有一定的影响,主要使分枝期叶绿素含量降低19.4%,但对ΦPSⅡ影响不显著。综合分析,UV-B辐射增强对大豆的影响主要体现在抑制叶片净光合速率,降低气孔导度,使得CO_2利用率下降,最终抑制了大豆生物量。
To study the effects of enhanced UV-B radiation on biomass,chlorophyll content and photosynthetic indices of soybean（ Glycine max Merr.）,simulated treatments with enhanced UV-B radiation under field condition were applied and related indices were measured in this research. The results showed that,enhanced UV-B radiation inhibited the growth and development during flowering period（ 21. 8% for plant height and 77. 0% for dry weight） and seed-filling period（ 18. 9% for plant height and 20. 8% for dry weight）. The UV-B radiation made the flavonoids content and malondialdehyde（ MDA） content increase during branching period（ 61. 7% and 35. 2% respectively） and flowering period（ 28. 9% and 37. 4% respectively）. The net photosynthetic rate was inhibited by 23. 2%,35. 9% and20. 8% during the three periods,respectively. The stomatal conductance was also inhibited and the intercellular CO2 concentration was increased. The enhanced UV-B radiation mainly inhibited the content of chlorophyll during branching period（ 19. 4%）,but no significant effect on ΦPS Ⅱ was found. In conclusion,enhanced UV-B radiation showed significant inhibition effects on net photosynthetic rate,stomatal conductance and CO2 assimilation rate,and the growth and biomass accumulations in soybean were finally decreased.
出处
《河南农业科学》
CSCD
北大核心
2016年第1期42-45,共4页
Journal of Henan Agricultural Sciences
基金
国家自然科学基金项目(31200387)
聊城大学大学生科技文化创新基金项目(SF2013294)
关键词
UV-B
大豆
类黄酮
光合特性
生物量
UV-B
soybean
flavonoids
photosynthesis characteristics
biomass
