The developmental and environmental regulation of gravitropic setpoint angle in Arabidopsis and bean.
The developmental and environmental regulation of gravitropic setpoint angle in Arabidopsis and bean.
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DOI：
10.1038/srep42664
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发表时间：
2017-03-03
影响因子：
4.6
通讯作者：
Kepinski S
中科院分区：
文献类型：
--
作者：
Roychoudhry S;Kieffer M;Del Bianco M;Liao CY;Weijers D;Kepinski S
根和枝是植物形态的主要决定因素，对于有效捕获地下和地上资源至关重要。这些分支通常保持在相对于重力的特定角度，称为向重力设定点角（GSA）。我们以前已经表明，允许维护非垂直GSA的机制是高度生长素依赖的，在这里，我们调查根和芽分支GSA的发育和环境调节。我们发现，氮和磷的缺乏有相反的，生长素信号依赖的影响，侧根GSA在拟南芥：而低硝酸盐诱导较少的垂直侧根GSA，磷酸盐缺乏导致更垂直的侧根生长角度，这一发现与以前报道的生长角度反应豆不定根。我们发现，这种根类特异性差异GSA响应低磷反映了生长角的类似差异，这些根类型之间的生长素处理。最后，我们表明，这两个阴影，低红光/远红光条件和高温诱导更多的垂直生长在拟南芥枝条。我们讨论的背景下，努力提高作物性能，通过操纵根和枝分支生长角度这些研究结果的意义。
Root and shoot branches are major determinants of plant form and critical for the effective capture of resources below and above ground. These branches are often maintained at specific angles with respect to gravity, known as gravitropic set point angles (GSAs). We have previously shown that the mechanism permitting the maintenance of non-vertical GSAs is highly auxin-dependent and here we investigate the developmental and environmental regulation of root and shoot branch GSA. We show that nitrogen and phosphorous deficiency have opposing, auxin signalling-dependent effects on lateral root GSA in Arabidopsis: while low nitrate induces less vertical lateral root GSA, phosphate deficiency results in a more vertical lateral root growth angle, a finding that contrasts with the previously reported growth angle response of bean adventitious roots. We find that this root-class-specific discrepancy in GSA response to low phosphorus is mirrored by similar differences in growth angle response to auxin treatment between these root types. Finally we show that both shaded, low red/far-red light conditions and high temperature induce more vertical growth in Arabidopsis shoot branches. We discuss the significance of these findings in the context of efforts to improve crop performance via the manipulation of root and shoot branch growth angle.