摘要
离体玉米叶片在光照下叶黄素循环与非辐射能量耗散发生明显变化 .随着光强提高 ,玉米黄质 (Z)含量显著上升 ,单环氧玉米黄质 (A)含量在中低光强时增加但在较强光照下略有降低 ,紫黄质 (V)含量则呈下降趋势 ,但叶黄素循环组分库V +A +Z上升幅度不大 ;相同条件下非辐射能量耗散增强 ,表现为非光化学猝灭荧光参数 (NPQ)明显上升 ,同时Fv/Fm 下降 .分析表明 ,(Z +0 5A) / (V +A +Z)与NPQ呈明显正相关 ,而与Fv/Fm 呈显著负相关 ,(V +0 5A) / (V +A +Z)则与之相反 .由此推测 ,离体条件下玉米叶片中Z的环氧化和V的脱环氧化明显与非辐射能量耗散和PSⅡ光能转化过程相关 .
The xanthophyll cycle and non-radiative energy dissipation in detached maize (Zea mays L.) leaves produced significant changes under illumination. With the raising of light intensity, zeaxanthin (Z) content evidently rose, violaxanthin (V) content significantly decreased, antheraxanthin (A) content significantly increased in low and middle level lights, and then decreased slightly in strong lights. The xanthophyll cycle components pool size V + A + Z only enlarged a little. Under the same conditions, the non-radiative energy dissipation of leaves apparently enhanced, which was shown that non-photochemical quenching (NPQ) rapidly rose, while F-v/F-m apparently reduced. It was analysed that (Z + 0.5A) / (V + A + Z) had exhibited apparently positive linear correlation with NPQ, and showed a negative correlation with F-v/F-m. Compared to (Z + 0.5A) / (V + A + Z), (V + 0.5A) / (V + A + Z) had showed contrary results. Based on the results, it was deduced that Z epoxidation and V deepoxidation had been significantly related to non-radiative energy dissipation and PSII light energy conversion in detached maize leaves.
出处
《生物化学与生物物理进展》
SCIE
CAS
CSCD
北大核心
2002年第1期91-93,共3页
Progress In Biochemistry and Biophysics
基金
广东省自然科学基金资助项目 (0 0 0 990 )~~
关键词
叶黄素循环
非辐射能量耗散
光照
玉米
xanthophyll cycle
non-radiative energy dissipation
illumination
maize
