山西部分梨品种抗寒性测定及生理指标研究

通过鉴定山西部分梨品种的抗寒性以达到对抗寒育种中亲本的选择。以1 年生梨枝条为试材，在人工低温处理下研究7 个梨品种枝条中相对电导率、可溶性糖、可溶性蛋白、脯氨酸和束缚水含量的变化规律，并分析各生理指标之间的相关性。结果表明：（1）供试梨品种的抗寒性顺序为：‘苹果梨’>‘晋酥梨’>‘晋蜜梨’>‘玉露香梨’>‘雪花梨’>‘玉酥梨’>‘库尔勒香梨’。（2）相对电导率、可溶性糖、脯氨酸和可溶性蛋白含量随处理温度的下降而上升。（3）可溶性糖含量与抗寒性呈显著正相关，而脯氨酸和可溶性蛋白含量与抗寒性无明显相关性。综合以上研究结果，在低温胁迫条件下，可溶性糖可单独作为抗寒性的鉴定指标。鉴定指标。

Determined the Cold Resistance on some Pear Varieties and Studied on Its Resistance Physiology in ShanXi Province

We identified some pear varieties of cold resistance in Shanxi Province, in order to achieve parental choice in cold resistance breeding. With 1 year old dormant pear shoots as test materials, the relative conductivity, soluble sugar, soluble protein, proline and bound water content in 7 pear cultivars shoots during the artificial low temperature treatment was investigated, and the correlation of these indexes was analyzed. The results were as follows：（1） The order for the cold resistance of the three cultivars from stronger to weaker was‘Pingguoli’,‘Jinsuli’,‘Jinmili’,‘Yuluxiangli’,‘Xuehuali’,‘Yusuli’and‘Korla fragant’pear. （2） The content of soluble sugar, soluble protein, proline and relative conductivity increased gradually with the reducing of temperature. （3） The content of soluble sugar had positively high significance related to hardiness, soluble protein and proline content had no obvious correlation with the cold resistance. According to the above results, we could conclude that the soluble sugar should be used alone as a screening index of cold resistance in pear under the condition of low temperature stress.