CONTROL OF SENESCENCE IN MARCHANTIA BY PHYTOCHROME
CONTROL OF SENESCENCE IN MARCHANTIA BY PHYTOCHROME
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DOI：
10.1104/pp.48.4.407
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发表时间：
1971-01-01
期刊：
影响因子：
7.4
通讯作者：
FREDERIC.H
中科院分区：
文献类型：
--
作者：
DEGREEF, J;BUTLER, WL;FREDERIC.H
地钱成熟的绿色组织。当置于连续黑暗中4天时明显漂白，但当每天给予1小时的白色光时保持绿色。然而，当每天1小时的光周期用远红光短暂照射终止时，组织被诱导漂白。当每次用远红光照射之后用红光短暂照射时，不会发生漂白。漂白被认为是衰老的指标，因为漂白组织中叶绿素的损失伴随着细胞器和细胞质的分解。光敏色素显然与光对衰老的控制有关。还发现，每天给予一次5分钟的红光与用白色光的1小时光周期在防止漂白方面同样有效，并且当每天用红光照射5分钟后用远红光照射10分钟时，诱导漂白。
Mature green tissue ofMarchantia polymorphaL. bleaches markedly when placed in continuous darkness for 4 days but remains green when given daily 1-hour photoperiods of white light. The tissue, however, is induced to bleach when each daily 1-hour photoperiod is terminated with a brief irradiation with far red light. The bleaching does not occur when each irradiation with far red light is followed by a brief irradiation with red light. The bleaching is taken as an index of senescence since the loss of chlorophyll in the bleached tissue is accompanied by a breakdown of cell organelles and cytoplasm. Phytochrome is clearly implicated in the control of senescence by light. It was also found that 5 minutes of red light given once a day was as effective as the 1-hour photoperiods with white light in preventing the bleaching and that bleaching was induced when each daily 5-minute irradiation with red light was followed by a 10-minute irradiation with far red light.