Abstract:

Purple leaf mustard is a new type of healthy vegetable，rich in anthocyanins．Based on the purple-green leaf mustard near isogenic lines（NILs），this paper studied the microscopic distribution and content of anthocyanins in purple leaf mustard，and effect of anthocyanins on its photosynthesis．The results demonstrated that anthocyanins in purple leaf mustard were distributed in the upper and lower epidermis of mustard leaves．Under same light radiation intensity or same CO₂ concentration，the net photosynthetic rate of single plant of purple leaf was significantly lower than that of green leaf．The light compensation point，light saturation point and maximum carboxylation rate of single plant with purple leaf were extreme significantly lower than those with green leaf．The electron transport rate and maximum photosynthesis rate of the single plant with purple leaf was significantly lower than those with green leaf．The anthocyanin content in purple leaf mustard was significant or extremely significant negatively correlated to its photosynthesis characteristics as increasing anthocyanin content would reduce photosynthetic efficiency．

Key words: Mustard（Brassica juncea L.）, Purple leaf, Anthocyanin, Chlorophyll, Photosynthesis

摘要：

紫叶芥菜是富含花青素的一种新型保健蔬菜。本试验在建立紫叶- 绿叶芥菜近等基因系的基础上，研究紫叶芥菜花青素的微观分布、花青素含量以及花青素对芥菜光合作用的影响。结果表明：紫叶芥菜花青素分布于叶片上下表皮，其含量显著高于绿叶芥菜，但叶绿素含量二者之间差异不显著；在相同光照辐射强度或相同CO₂ 浓度条件下，紫叶单株的净光合速率明显低于绿叶单株，光补偿点、光饱和点、最大羧化速率极显著低于绿叶单株，电子传递速率、最大光合速率显著低于绿叶单株；紫叶芥菜花青素含量与其光合作用参数呈显著或极显著负相关性，随着花青素含量的增加其光合作用效率降低。

关键词: 芥菜, 紫叶, 花青素, 叶绿素, 光合作用