Engelsma G
Philips Research Laboratories, Eindhoven, The Netherlands.
Plant Physiol. 1974 Nov;54(5):702-5. doi: 10.1104/pp.54.5.702.
Irradiation with ultraviolet light causes in the hypocotyl of dark-grown gherkin seedlings the partial conversion of trans-hydroxycinnamic acids to the cis-isomers. The trans-hydroxycinnamic acids inhibit the development of phenylalanine ammonia-lyase activity, and the transformation of these compounds to the much less inhibitory cis-isomers forms a ready explanation for the increase in phenylalanine ammonia-lyase activity in the hypocotyl of gherkin seedlings irradiated with ultraviolet light. Arguments are advanced that the increase in phenylalanine ammonia-lyase activity caused by irradiation with blue light is also (at least in part) initiated by trans-cis isomerisation of the hydroxycinnamic acids.
用紫外线照射黑暗中生长的小黄瓜幼苗的下胚轴,会使反式羟基肉桂酸部分转化为顺式异构体。反式羟基肉桂酸会抑制苯丙氨酸解氨酶活性的发展,而这些化合物向抑制性小得多的顺式异构体的转化,很好地解释了用紫外线照射的小黄瓜幼苗下胚轴中苯丙氨酸解氨酶活性的增加。有人提出,蓝光照射引起的苯丙氨酸解氨酶活性增加(至少部分)也是由羟基肉桂酸的反 - 顺异构化引发的。