摘要
采用塑料袋营养土栽培试验方法,研究了Cd对枇杷苗生长和光合速率的影响。结果表明,高浓度的Cd对枇杷的生长有显著的抑制作用,且随着Cd浓度的增加,这种抑制作用愈明显。300、400、500 mg.L-1Cd处理使根系生物量分别比对照下降了35.75%、38.78%、43.04%,茎生物量分别比对照下降了29.84%、34.31%、37.93%,叶生物量则分别比对照下降了31.06%、34.83%、39.57%,并且使根的含水量分别比对照下降了9.27%、11.78%、12.91%,茎的含水量分别比对照下降了11.97%、12.24%、15.34%,叶的含水量分别比对照下降了10.61%、15.57%、18.50%。枇杷对Cd的敏感程度表现为根>叶>茎。Cd胁迫使枇杷叶片叶绿素以及类胡萝卜素含量下降,叶绿素b比叶绿素a和类胡萝卜素(Car)更容易受到伤害,叶绿素b、类胡萝卜素的含量基本同步减少。Cd胁迫影响枇杷叶片的光合作用,造成光合效率的降低,净光合速率下降。
Loquat seedlings were cultivated in plastics bags with nutritive soil to study the effects of cadium stress on its growth and photosynthesis. A significantly inhibitory function of cadmium （Cd） towards growth of loquat was observed at a dosage of above 300 mg · L^-1 in soil culture, among which the inhibitory function became more seriously with ascent of Cd content. It was discovered that the plant biomasses of root was reduced with treatments of 300,400,500 mg · L^-1 by 35.75%, 38.78%, and 39.57%, respectively. The water contents in root treated by 300,400,500 mg · L^-1 decreased by 9.27%, 11.78%, 12.91%, respectively, compared with the control, while the stem and leaf for the tested plant reduced by 11.97%, 12.24%, 15.34% and 10.61%, 15.57%, 18.50%, respectively. The root was the most sensitive to Cd stress, followed by leaf and stem. The contents of chl and carotenoid dropped under Cd stress. Chl b was injured more easily than chl and Carotenoid. The contents of Chl b and carotenoid reduced in parallel. The net photosynthetic rate of loquat leaf was reduced significantly under Cd stress.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第B03期33-38,共6页
Journal of Agro-Environment Science
关键词
枇杷
CD胁迫
生长
光合速率
loquat
cadmium stress
growth
photosynthetic rate
