杏树受嗜果刀孢菌侵染后叶片内苯丙氨酸解氨酶活性的变化

初步研究了杏树叶片受嗜果刀孢菌Ｃｌａｓｔｅｒｏｓｐｏｒｉｕｍ　ｃａｒｐｏｐｈｉｌｕｍ（Ｌｅｗ）Ａｄｅｒｈ．侵染后苯丙氨酸解氨酶（ＰＡＬ）活性的变化，结果表明：接种后抗病品种苯丙酸类代谢被激活的程度高。李光杏（高抗）在接种后１２ ｈ与８４ ｈ出现两个酶活性高峰，张公园杏（中抗）在接种后６０ ｈ ＰＡＬ活性达到最高，兰州大接杏（感病）在接种后８４ｈ才趋于活性高峰。供试品种只有李光杏与对照达到差异显著（ａ＝ ０．０１），表明高抗品种酶活性高峰出现得早，升高幅度大。

Studies on the Changes in Phenylalanine Ammonia Lyase(PAL) Activity in Apricot Leaves from Infected Trees by Clasterosporium carpophilum(Lew) Aderh

The resistance of three apricot cultivars to Clasterosporium carpophilum (Lew)Aderh. was studied specifically on the activity of phenylalanine ammonia lyase (PAL) in leaves from infected trees. Results showed the metabolism of the Phenylalanine system was activated in resistant cultivars after inoculation. In high-resistant Liuang cultivar, the PAL activity increased greatly and appeared 2 peaks after 12 and 84 home; in mid-resistant Zhanggongyuan cultivar, the activity of PAL reached a maximum after 60 hours. but didn' t reached a maximum in susceptible Lanzhoudajiexing cultivar until for 84 hours. When compared with control, it only increased significantly (a = 0.01) in Liguang cultivar.This suggested that the maximum of PAL activity appeared early and increased in a large scope in high-resistant cultivars.