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以3个蝴蝶兰黄花品系‘小天鹅’、‘皇后’、‘KV642’为试材,研究了不同光强(500、300和100μmol·m-2·s-1)对蝴蝶兰抗氧化酶、丙二醛(MDA)、光合色素的影响。结果表明:‘小天鹅’和‘KV642’在100μmol·m-2·s-1弱光胁迫下MDA含量最高,过氧化物酶(POD)酶活性较高,光合色素含量最高;300μmol·m-2·s-1光强下MDA含量最低,POD酶活性较低,叶绿素a和叶绿素b含量最低。‘皇后’品系在100μmol·m-2·s-1光强下MDA含量最高,POD酶活性最大;500μmol·m-2·s-1光强下MDA含量最低,POD酶活性最低。‘皇后’叶绿素a、叶绿素b和类胡萝卜素含量均随着光强的降低而降低。因此,300μmol·m-2·s-1为‘小天鹅’和‘KV642’品系营养生长阶段适宜的光强;500μmol·m-2·s-1为‘皇后’品系营养生长阶段适宜的光强。
The effects of different light intensities (500, 300 and 100 μmol · m-2 · s-1) on the activities of antioxidant enzymes, Malondialdehyde (MDA), photosynthetic pigments. The results showed that under the low light stress of 100μmol · m-2 · s-1, ’Little Swan’ and ’KV642’ had the highest content of MDA, the highest activity of peroxidase (POD) and the highest content of photosynthetic pigment. Under the light intensity of 2 · s-1, MDA content was the lowest, POD activity was lower, chlorophyll a and chlorophyll b were the lowest. Under the light intensity of 100μmol · m-2 · s-1, the ’Queen’ strain had the highest MDA content and the highest POD activity, while the lowest MDA content and the lowest POD activity under the light intensity of 500μmol · m-2 · s-1. ’Queen’ chlorophyll a, chlorophyll b and carotenoid content decreased with the light intensity decreased. Therefore, 300μmol · m-2 · s-1 was suitable light intensity for vegetative growth of ’Little Swan’ and ’KV642’ lines; 500μmol · m-2 · s-1 was suitable light intensity .