根据我国各地大白菜的生产实践经验,大都认为叶色较深的青帮系统品种如城阳青、小青口等一般表现抗病性较强,对于直接为害叶片的霜霉病,这种表现尤为明显。这可能是由于叶色深,叶绿素含量相应较高,光合强度也较高,有利于植株同化养分的积累和抗性的增强。为了探明大白菜叶绿素? According to the practice of production of Chinese cabbage all over the country, most of them think that the leaf color of the deep-green system such as Chengyang Qing, Xiaoqingkou, etc. generally showed strong resistance to downy mildew directly affected by the blade, obvious. This may be due to dark leaf color, chlorophyll content corresponding higher photosynthetic intensity is also conducive to the accumulation of plant assimilation nutrients and resistance enhancement. In order to prove the chlorophyll of Chinese cabbage?