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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Gravitropic plant growth regulation and ethylene: an unsought cardinal coordinate for a disused model
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Gravitropic plant growth regulation and ethylene: an unsought cardinal coordinate for a disused model

机译：引力植物的生长调节和乙烯：废弃模型的未找到基数坐标

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According to the Cholodny-Went hypothesis, gravitropic differential growth is brought about by the redistribution of aixin (indolyl-3-acetic acid, IAA). We reinvestigated the relevance of different auxins and studied the role of ethylene in hypocotyls of sunflower and shoots and roots of rye and maize seedlings. Incubation of coleoptiles and of sunflower hypocotyls in solutions of IAA and dichlorophenoxyacetic acid as well as naphthylacetic acid resulted in a two- to threefold length increase compared to water controls. In spite of this pronounced general effect on elongation growth, gravi-curvature was similar to water controls. In contrast to this, inhibition of ethylene synthesis by aminoethoxyvinylglyeine prevented differential growth of both hypocotyls and coleoptiles and of roots of maize. In horizontally stimulated maize roots growing on surfaces, inhibition of ethylene perception by methylcyclopropene inhibited roots to adapt growth to the Surface, resulting in a lasting vertical orientation of the root tips. This effect is accompanied by up- and down-regulation of a number of proteins as detected by two-dimensional matrix-assisted laser desorption-ionization time-of-flight mass spectrometry. Together the data query the regulatory relevance of IAA redistribution for gravitropic differential growth. They corroborate the crucial regulatory role of ethylene for gravitropic differential growth, both in roots and coleoptiles of maize as well as in hypocotyls.
机译：根据Cholodny-Went假说，重力生长的差异是由爱信素（吲哚基-3-乙酸，IAA）的重新分布引起的。我们重新研究了不同生长素的相关性，并研究了乙烯在向日葵下胚轴，黑麦和玉米幼苗的根和茎中的作用。与水对照相比，胚芽鞘和向日葵胚轴在IAA和二氯苯氧基乙酸以及萘乙酸中的孵育导致长度增加了2到3倍。尽管对伸长率增长有明显的一般影响，但重力曲率与水控制相似。与此相反，氨基乙氧基乙烯基甘氨酸抑制乙烯的合成阻止了胚轴和胚芽鞘以及玉米根的差异生长。在水平生长的玉米根表面生长时，甲基环丙烯对乙烯的抑制作用会抑制根，使其适应表面生长，从而导致根尖持久地垂直定向。二维矩阵辅助激光解吸电离飞行时间质谱法检测到，此效应伴随着多种蛋白质的上调和下调。数据一起查询了IAA重新分配与重力差异增长的监管相关性。它们证实了乙烯对玉米的根和胚芽鞘以及下胚轴中的重力差异生长的关键调节作用。

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