Schaer J A, Mandoli D F, Briggs W R
Carnegie Institution of Washington, Stanford, California 94305-1297.
Plant Physiol. 1983 Jul;72(3):706-12. doi: 10.1104/pp.72.3.706.
Red light-induced cell elongation and division in intact, etiolated oat (Avena sativa cv Lodi) seedlings have been assessed. The middle of coleoptile was especially responsive in the very low fluence range whereas the region immediately below the coleoptile tip and the two regions just above the coleoptilar node were more responsive than the entire organ in the low fluence range. These responses in the coleoptile are both the result of an increase in cell elongation. Coleoptile cell division is slightly inhibited in the very low and slightly stimulated by red light in the low fluence range.The one-sixth of the mesocotyl closest to the node is more suppressed in its growth than is any other region in the very low fluence range. However, the low fluence response involved the entire mesocotyl equally. In the apical one-sixth of the mesocotyl, a strong suppression of cell division and a weak suppression of cell elongation occurs. In the lower five regions of the mesocotyl, red light in both fluence ranges suppresses only cell elongation. Apparently, the difference between red light-induced oat growth stimulation and suppression primarily involves differences in the response of the cell elongation process.
已对红光诱导完整黄化燕麦（燕麦品种Lodi）幼苗的细胞伸长和分裂进行了评估。在极低光通量范围内，胚芽鞘中部反应尤为明显，而在低光通量范围内，胚芽鞘尖端正下方区域以及胚芽鞘节上方的两个区域比整个器官反应更强烈。胚芽鞘中的这些反应均是细胞伸长增加的结果。在极低光通量下，胚芽鞘细胞分裂略有抑制，而在低光通量范围内，红光对其有轻微刺激作用。在极低光通量范围内，最靠近节的中胚轴六分之一部分的生长受到的抑制比其他任何区域都更明显。然而，低光通量反应在整个中胚轴上是均匀的。在中胚轴顶端的六分之一部分，细胞分裂受到强烈抑制，细胞伸长受到微弱抑制。在中胚轴较低的五个区域，两个光通量范围内的红光都仅抑制细胞伸长。显然，红光诱导燕麦生长刺激和抑制之间的差异主要涉及细胞伸长过程反应的差异。
