Department of Biological Sciences, State University of New York at Albany, Albany, New York 12222.
Plant Physiol. 1974 Apr;53(4):610-4. doi: 10.1104/pp.53.4.610.
Hook opening in seedlings of Cuscuta gronovii Willd. occurred only after prolonged exposures to blue, red, or far red light. Prolonged far red exposure was less effective than prolonged exposure to red or blue light. Brief far red irradiation inhibited the inductive effect of red light. The far red inhibition was in turn reversed by brief red irradiation. These effects suggest the involvement of two photosystems in the control of hook opening in Cuscuta gronovii Willd.: a phytochrome-mediated system and a separate high energy requirement.
菟丝子幼苗的钩弯曲只有在长时间暴露于蓝光、红光或远红光下才会发生。远红暴露时间延长不如红或蓝光有效。短暂的远红辐射抑制了红光的诱导效应。远红抑制作用反过来又被短暂的红光照射所逆转。这些效应表明,在控制菟丝子钩弯曲中涉及到两个光系统:一个是光敏色素介导的系统,另一个是需要高能量的独立系统。