PHOTOTROPISM IN PHYCOMYCES MUTANTS LACKING β‐CAROTENE
PHOTOTROPISM IN PHYCOMYCES MUTANTS LACKING β‐CAROTENE
复制标题
缺乏 β-胡萝卜素的藻类突变体的向光性
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
M. Delbrück
中科院分区：
文献类型：
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作者：
D. Presti;W. Hsu;M. Delbrück
抽象的。β-胡萝卜素和核黄素被认为是Phycometra和许多其他生物体中对蓝光产生生理反应的光感受器的主要候选者。在从八氢番茄红素生物合成β-胡萝卜素的所有六个步骤中被阻断的藻蓝蛋白突变体不含可检测的β-胡萝卜素（小于野生型量的4倍10 - 5），但表现出与野生型相同的向光反应。此外，野生型藻胆固醇虽然富含反式-β-胡萝卜素，但不含可检测到的顺式-β-胡萝卜素，有时基于近UV区域中的顺式物质吸收光谱与蓝光响应的许多作用光谱的密切相似性而被提出作为光感受器候选物。这些结果表明，β-胡萝卜素不能作为Phycomerma向光性的光感受器。
Abstract. β‐carotene and riboflavin are considered as the major candidates for the photoreceptor for physiological responses to blue light in Phycomyces and a number of other organisms. Mutants of Phycomyces blocked in all six steps of the biosynthesis of β‐carotene from phytoene contain no detectable β‐carotene (less than 4 times 10‐5 of wild‐type amount) but exhibit phototropic responses identical to wild‐type. Moreover, wild‐type Phycomyces, while abundant in trans‐β‐carotene, contains no detectable cis‐β‐carotene, sometimes proposed as a photoreceptor candidate on the basis of the close similarity of the cis‐species absorption spectrum in the near UV region to many action spectra for blue‐light responses. These results indicate that β‐carotene cannot be the photoreceptor for phototropism in Phycomyces.