Low temperature phenomena of soybean of different genotype

Chinese. 为了解不同基因型大豆冠层冷温现象，应用红外测温仪对大豆冠层温度进行了长期观测，并测定了大豆生育期的蒸腾速率和净光合速率，以及大豆主茎功能叶片的可溶性蛋白质、丙二醛含量。结果表明，不同基因型大豆品种冠层温度存在着明显的分异现象，其中NF58与秦豆8号（对照）的冠层温差最高值为－1.47 ℃，最低值为－0.02 ℃，均低于基准线（0 ℃线，下同），为冷型大豆；94101与秦豆8号（对照）的冠层温差最高值为1.48 ℃，最低值为0.02 ℃，均高于基准线，属暖型大豆，且冷型大豆NF58具有较强的生理活性，表现在叶片功能期较长，蒸腾速率和净光合速率较高，蛋白质含量较高，丙二醛（MDA）含量较低，说明在大豆品种选育中以冷温材料为亲本或在育种中以冷温作为目标性状之一值得重视。_

English. In order to find out low temperature phenomena of soybean of different genotype, the infrared radiation thermometer was used to observe the soybean's canopy temperatures for a long time, at the same time, transpiration rate, net photosynthetic rates and soluble protein content, MDA content of the functional leaves of soybean caulis in periods of duration were surveyed. The results showed that the canopy temperature of different genotype soybean showed obviously different phenomena, the highest canopy temperature contrast between NF58 and the CK Qindou 8 was －1.47 ℃, the lowest value was －0.02 ℃, and both were under the datum line (0 ℃ line, the next is the same), so NF58 was cold soybean; the highest canopy temperature contrast between 94101 and the CK Qindou 8 was 1.48 ℃, the lowest value was 0.02 ℃, and both were over the datum line, so 94101 was warm soybean. Cold soybean had an upper physiological activity, its leaves function period was longer, transpiration rate, net photosynthetic rates and protein content were higher and MDA content was lower. These illustrated cold temperature materials as parentage in soybean breeds selection and breeding or as one of targeting traits in breeding program should be valued.