重力对玉米根冠细胞中造粉体形成的影响
The influence of gravity on the formation of amyloplasts in columella cells of Zea mays L.
作者信息
Moore R, Fondren W M, Koon E C, Wang C L
机构信息
Department of Biology, Baylor University, Waco, Texas 76798, USA.
出版信息
Plant Physiol. 1986;82(3):867-8. doi: 10.1104/pp.82.3.867.
Columella (i.e., putative graviperceptive) cells of Zea mays seedlings grown in the microgravity of outer space allocate significantly less volume to putative statoliths (amyloplasts) than do columella cells of Earth-grown seedlings. Amyloplasts of flight-grown seedlings are significantly smaller than those of ground controls, as is the average volume of individual starch grains. Similarly, the relative volume of starch in amyloplasts in columella cells of flight-grown seedlings is significantly less than that of Earth-grown seedlings. Microgravity does not significantly alter the volume of columella cells, the average number of amyloplasts per columella cell, or the number of starch grains per amyloplast. These results are discussed relative to the influence of gravity on cellular and organellar structure.
在太空微重力环境下生长的玉米幼苗的根冠（即假定的重力感受）细胞分配给假定平衡石（淀粉体）的体积明显小于在地球上生长的幼苗的根冠细胞。在太空飞行中生长的幼苗的淀粉体明显小于地面对照的淀粉体，单个淀粉粒的平均体积也是如此。同样，在太空飞行中生长的幼苗的根冠细胞中淀粉体的淀粉相对体积明显小于在地球上生长的幼苗。微重力不会显著改变根冠细胞的体积、每个根冠细胞中淀粉体的平均数量或每个淀粉体中淀粉粒的数量。结合重力对细胞和细胞器结构的影响对这些结果进行了讨论。
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