近年来的一系列研究都指出约250—300个叶绿素分子和一个作用中心组成了一个光合作用单位。
Recent studies have suggested that a "photosynthetic unit" of about 250-300 chlorophyll molecules may be associated with one "active center".
单位叶面积的叶绿素素含量在幼叶和老叶较低而成熟叶中较高，类胡萝卜素随着叶龄的增加而增加。
Chlorophyll contents were less in young and old leaves than in mature leaves, while carotenoids were increased with leaf age.
单位叶面积的叶绿素素含量在幼叶和老叶较低而成熟叶中较高，类胡萝卜素随着叶龄的增加而增加。
Chlorophyll contents were less in young and old leaves than in mature leaves, while carotenoids were increased with leaf age.
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