| Abstract: Aiming at the northern autumn and winter haze, the low temperature and low light caused great obstacles and harms to the production of sweet pepper in winter solar greenhouse, using 'Xunchi' (resistant to low temperature and weak light, CK1) and 'Qiemen' (not resistant to low temperature and weak light, CK2) as the reference materials, six physiological indexes for resistance to weak light and low temperature changes containing SOD, CAT, MDA, proline, soluble protein content and plasma membrane permeability were identified and analyzed among 12 sweet pepper materials seedlings. At the same time, with the solar greenhouse in north as the facility condition, the environmental conditions of low temperature and low light were artificially created by means of shading net and releasing wind in autumn and winter. The results showed that in the identification of low temperature and weak light at seedling stage in the laboratory, the order of low temperature and weak light tolerance of 12 tested cultivars was: 'Jiyan 105' 'Jiyan 108' 'Jiyan 20' 'Jiyan 16' 'Jinhuangguan' 'Xunchi' 'L20' 'T49' 'L30' 'Qiemen' 'L12' 'Fukang'. Under low temperature and low light conditions, the plant tolerance of 12 test cultivars was from strong to weak: 'Jiyan 105' 'Jiyan 108' 'Jiyan 20' 'Xunchi' 'Jiyan 16' 'Jinhuangguan' 'L20' 'T49' 'L30' 'L12' 'Fukang' 'Qiemen'. Combining the results of laboratory and greenhouse, six cultivars with resistance to low temperature and weak light were selected, which included 'Jiyan 105' 'Jiyan 108' 'Jiyan 20' 'Jiyan 16' 'Jinhuangguan' 'Xunchi'. The low temperature and low light resistance germplasm resources of sweet pepper can be identified quickly and accurately by combining with seedlings identification of sweet pepper plants under low temperature and low light in laboratory and low temperature and low light resistance identification and screening in test site. |