Abe K, Takahashi H, Suge H
Institute of Genetic Ecology, Tohoku University, Sendai, Japan.
J Plant Res. 1998 Dec;111(1104):523-30. doi: 10.1007/BF02507787.
We have compared shoot responses of agravitropic rice and barley plants to vertical inversion with those of normal ones. When rice plants were vertically inverted, the main stems of a japonica type of rice, cv. Kamenoo, showed negative gravitropism at nodes 2-15 of both elongated and non-elongated internodes. However, shoots of lazy line of rice, lazy-Kamenoo, bent gravitropically at nodes 11-15 only elongated internodes but not at nodes 2-10 of non-elongated ones. Thus, shoots of Kamenoo responded gravitropically at all stages of growth, whereas shoots of lazy-Kamenoo did not show gravitropic response before heading. In Kamenoo plants, lengths of both leaf-sheath and leaf-blade were shortened by vertical inversion, but those of the vertically inverted plants of lazy-Kamenoo were significantly longer than the plants in an upright position. When agravitropic and normal plants of barley were vertically inverted, the same results as in rice were obtained; elongation of both leaf-sheath and leaf-blade was inhibited in normal barley plants, Chikurin-Ibaragi No. 1, but significantly stimulated in agravitropic plants of serpentina barley. These results suggest that vertical inversion of rice and barley plants enhances the elongation growth of leaves in the absence of tropistic response.
我们已将去重力水稻和大麦植株对垂直倒置的茎秆反应与正常植株的反应进行了比较。当水稻植株垂直倒置时，粳稻品种龟之尾的主茎在伸长节间和未伸长节间的第2至15节处均表现出负向重力性。然而，水稻懒生系品种懒龟之尾的茎秆仅在伸长节间的第11至15节处表现出向重力弯曲，而在未伸长节间的第2至10节处则未表现出这种弯曲。因此，龟之尾的茎秆在生长的各个阶段均表现出向重力性反应，而懒龟之尾的茎秆在抽穗前未表现出向重力性反应。在龟之尾植株中，垂直倒置会使叶鞘和叶片的长度缩短，但懒龟之尾垂直倒置植株的叶鞘和叶片长度显著长于直立植株。当大麦的去重力植株和正常植株垂直倒置时，得到了与水稻相同的结果；正常大麦品种筑紫伊贺1号植株的叶鞘和叶片伸长受到抑制，但蛇形大麦的去重力植株的叶鞘和叶片伸长受到显著促进。这些结果表明，水稻和大麦植株的垂直倒置在没有向性反应的情况下会增强叶片的伸长生长。
