RED LIGHT, AUXIN RELATIONSHIPS, AND PHOTOTROPIC RESPONSES OF CORN AND OAT COLEOPTILES
RED LIGHT, AUXIN RELATIONSHIPS, AND PHOTOTROPIC RESPONSES OF CORN AND OAT COLEOPTILES
复制标题
DOI：
10.2307/2439853
复制
发表时间：
1963-01-01
影响因子：
3
通讯作者：
BRIGGS, WR
中科院分区：
文献类型：
--
作者：
BRIGGS, WR
红光降低玉米（Zea mays Burpee“黄金十字架矮脚鸡”）和燕麦（Avena sativa Victory）胚芽鞘的向光敏感性。如文献中所述，通过绘制对数剂量与对较高剂量的响应的曲线的偏移来反映该降低。在没有红光处理的情况下，1,000米烛光秒（mcs）的白色光在燕麦中诱导第一个负曲率，而在玉米中几乎没有曲率，这似乎缺乏第一个负曲率的机制。紧接着2小时的红光处理，相同的白色光剂量诱导几乎最大的第一个积极的曲率在玉米和燕麦胚芽鞘。曲率的增加反映了两种植物的向光敏感性的降低，其由剂量-反应曲线的移动所示。红光处理后，红光的效果保持最大的一个小时，衰减到非红色处理的植物在另一个2小时内的水平。红光抑制玉米胚芽鞘生长素的生产。在红色处理结束后，效果衰减。这两种变化都遵循与向光敏感性变化平行的时间过程。1，000 mcs光剂量诱导生长素在红色处理和未处理的玉米胚芽鞘中的侧向运输，尽管后者缺乏曲率。红光不会诱导燕麦向光敏感性变化的昼夜节律，如果在向光诱导后给药则无效，其作用可能是由光敏色素介导的。假设，而不是原来的与本文，即红光诱导的色素介导的第二个正曲率的量的增加最密切的帐户所获得的结果。相关文献进行了讨论。
Red light decreases the phototropic sensitivity of corn (Zea mays Burpee "Golden Cross Bantam") and oat (Avena sativa Victory) coleoptiles. The decrease is reflected by a shift of the curve ploting log dosage vs. response to higher dosages, as described in the literature. In the absence of red light treatment, 1,000 meter-candle-seconds (mcs) white light induces first negative curvature in oats and almost no curvature in corn, which appears to lack the mechanism for first negative curvature. Immediately following a 2-hr red light treatment, the same white light dosage induces almost maximum first positive curvature both in corn and in oat coleoptiles. The increase in curvature obtained reflects the decreased phototropic sensitivity of both plants shown by the dosage-response curve shift. After red treatment, the effect of red light remains maximal for an hour, decaying to the level of non-red-treated plants within another 2 hr. Red light suppresses auxin production by corn coleoptiles. The effect decays after the end of red treatment. Both changes follow time courses parallel to those for the phototropic sensitivity changes. The 1,000 mcs light dosage induces lateral transport of auxin both in red-treated and untreated corn coleoptiles, despite the lack of curvature of the latter. Red light does not induce a circadian rhythm for the phototropic sensitivity changes in oats, is not effective if administered after phototropic induction, and its effect is probably mediated by phytochrome. The hypothesis, not original with this paper, that red light induces an increase in the amount of pigment mediating second positive curvature most closely accounts for the results obtained. Pertinent literature is discussed.