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作 者 ：黄俊;郭世荣;吴震;李式军

期 刊 ：应用生态学报 2007年 18卷 02期 页码：352-358

关键词：白菜；

摘 要 ：研究了不结球白菜耐弱光品种“矮王”和不耐弱光品种“绿优”经弱光处理后，光合特性和叶绿体超微结构的变化.结果表明:遮荫处理后，“矮王”的总叶绿素和叶绿素b含量大幅度上升；2个品种的净光合速率（P_n）、光补偿点（LCP）、光饱和点（(LSP）、表观量子效率（AQY）、羧化效率（CE）均呈下降趋势；除光补偿点外，“矮王”的下降幅度均小于“绿优”.叶绿素荧光参数分析表明，在弱光条件下，“绿优”的光系统Ⅱ（PSII）受到伤害，F_v/F_m、ETR、Φ_PSⅡ和q_P的下降幅度均大于耐弱光品种“矮王”.电镜超微观察结果显示:“绿优”的叶绿体内部出现裂缝和孔洞，多数基质片层断裂，基粒片层解体，线粒体出现内含物减少、发生空洞的现象；而“矮王”的叶绿体结构良好，线粒体发育正常.表明弱光处理可以影响植物的光合机构，但对不同品种的影响不同.

Abstract:The study with two varieties of non-heading Chinese cabbage shade-tolerant ‘Aiwang’
and shade-sensitive ‘Lüyou’ showed that after shading, the total chlorophyll and chlorophyll b con-
tents of ‘Aiwang’ went up greatly, but the net photosynthetic rate (P_n), light compensation point
(LCP), light saturation point (LSP), apparent quantum yield (AQY) and carboxylation efficiency (CE)
of both ‘Aiwang’ and ‘Lüyou’ all went down, and the decline of all test parameters except LCP
was slighter for ‘Aiwang’ than for ‘Lüyou’. Under weak light condition, the PSⅡ of ‘Lüyou’
was injured, and as a result, the F_v/F_m, ETR, Φ_PSⅡ, and q_P of ‘Lüyou’ had a greater decline
than those of ‘Aiwang’. In the chloroplast of ‘Lüyou’, cracks and foveolae appeared, most
of stroma lamellae fractured, grana lamellae disaggregated, and mitochondria were nearly empty
with the decrease of contents. In contrast, the chloroplast structure of ‘Aiwang’ was flawless,
and its mitochondria grew well. It was suggested that weak light could damage the photosynthetic
organization of plant, but different varieties showed different responses.

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