不同品种辣椒幼苗光合与呼吸对弱光的响应
Response of photosynthesis and respiration to weak light in seedlings of four capsicum cultivars
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摘要: 分别在300μmol/m2·s和100μmol/m2·s的人工光源下，研究了“中椒5号”、“中椒6号”、“中椒10号”和“红英达”4个辣椒品种光合和呼吸特性对弱光的响应。结果表明，弱光下幼苗净光合速率(Pn)、暗呼吸速率(Rd)、夜间呼吸速率(Rn)、饱和光强(SL)、光补偿点(LCP)、光饱和光合速率(Pmax)下降，表观量子效率(AQY)上升。弱光下辣椒Pn的下降是非气孔限制的结果，较低的Rubisco羧化活性是辣椒Pmax下降的一个重要原因。弱光下辣椒叶片叶绿素(Chl.)含量上升，Chl.a/b值和比叶重(SLM)下降。供试品种中“中椒10号”在弱光下具有较低的LCP、Rd、Rn以及较高的AQY，表现出较强的弱光耐受性。Abstract: The characters of photosynthesis and respiration in seedlings of four capsicum cultivars,i.e.“Zhongjiao No.5”,“Zhongjiao No.6”，“Zhongjiao No.10”and“Hongyingda”,under 300μmol/m2·s and 100μmol/m2·s artificial light were studied.The results show that under weak light,net photosynthetic rate (Pn),dark respiration rate (Rd),night respiration rate (Rn),saturation light (SL),light compensation point (LCP) decrease,but apparent quantum yield (AQY) increases.The decrease of Pn under weak light is the result of non-stomatal limitation.The important cause of Pmax decreasing is lower rubisco carboxylation activity.Under weak light the chlorophyll content(Chl.)increases,but the chlorophyll a/b ratio (Chl.a/b) and specific leaf mass (SLM) decline. Among four capsicum cultivars,“Zhongjiao No.10”with relatively lower LCP,Rd and Rn,higher AQY under weak-light shows a potential weak-light-tolerance.
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Keywords:
- Capsicum /
- Weak light /
- Photosynthetic characteristics /
- Rubisco /
- Dark respiration rate
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