Dougher T A, Bugbee B
Crop Physiology Laboratory, Department of Plants, Soils and Biometeorology, Utah State University, 4820 Old Main Hill, Logan, UT 84322-4820, USA.
Photochem Photobiol. 2001 Feb;73(2):199-207. doi: 10.1562/0031-8655(2001)073<0199:ditrow>2.0.co;2.
Although many fundamental blue light responses have been identified, blue light dose-response curves are not well characterized. We studied the growth and development of soybean, wheat and lettuce plants under high-pressure sodium (HPS) and metal halide (MH) lamps with yellow filters creating five fractions of blue light. The blue light fractions obtained were < 0.1, 2 and 6% under HPS lamps, and 6, 12 and 26% under MH lamps. Studies utilizing both lamp types were done at two photosynthetic photon flux levels, 200 and 500 mumol m-2 s-1 under a 16 h photoperiod. Phytochrome photoequilibria was nearly identical among treatments. The blue light effect on dry mass, stem length, leaf area, specific leaf area and tillering/branching was species dependent. For these parameters, wheat did not respond to blue light, but lettuce was highly sensitive to blue light fraction between 0 and 6% blue. Soybean stem length decreased and leaf area increased up to 6% blue, but total dry mass was unchanged. The blue light fraction determined the stem elongation response in soybean, whereas the absolute amount of blue light determined the stem elongation response in lettuce. The data indicate that lettuce growth and development requires blue light, but soybean and wheat may not.
尽管已经确定了许多基本的蓝光反应，但蓝光剂量反应曲线的特征尚不明确。我们研究了大豆、小麦和生菜植株在高压钠灯（HPS）和金属卤化物灯（MH）下的生长发育情况，这些灯带有黄色滤光片，可产生五个蓝光比例。在HPS灯下获得的蓝光比例分别为<0.1%、2%和6%，在MH灯下为6%、12%和26%。在两种光合光子通量水平下进行了使用这两种灯的研究，在16小时光周期下分别为200和500 μmol m-2 s-1。各处理间的光敏色素光平衡几乎相同。蓝光对干质量、茎长、叶面积、比叶面积和分蘖/分枝的影响因物种而异。对于这些参数，小麦对蓝光无反应，但生菜对0%至6%蓝光比例高度敏感。大豆茎长在蓝光比例达到6%时下降，叶面积增加，但总干质量不变。蓝光比例决定了大豆的茎伸长反应，而生菜的茎伸长反应则由蓝光的绝对量决定。数据表明，生菜的生长发育需要蓝光，但大豆和小麦可能不需要。
