The Biphasic Root Growth Response to Abscisic Acid in Arabidopsis Involves Interaction with Ethylene and Auxin Signalling Pathways.
The Biphasic Root Growth Response to Abscisic Acid in Arabidopsis Involves Interaction with Ethylene and Auxin Signalling Pathways.
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拟南芥中对脓肿的双相生长反应涉及与乙烯和生长素信号通路的相互作用。
DOI：
10.3389/fpls.2017.01493
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发表时间：
2017
影响因子：
5.6
通讯作者：
Davies WJ
中科院分区：
文献类型：
--
作者：
Li X;Chen L;Forde BG;Davies WJ
已知外源脱落酸（阿坝）根据其浓度刺激或抑制根生长。在这项研究中，乙烯和生长素的作用在阿坝对根伸长的双相效应进行了研究，使用化学抑制剂和突变体。乙烯感知和生物合成的抑制剂和生长素流入抑制剂都被发现可以阻断高阿坝浓度的抑制作用，但不能阻断低阿坝浓度的刺激作用。另外，三个乙烯不敏感突变体（etr 1 -1，ein 2 -1，ein 3 -1），两个生长素内流突变体（aux 1 -7，aux 1-T）和一个生长素不敏感突变体（iaa 7/axr 2 -1）对高浓度阿坝的抑制作用不敏感。在低阿坝浓度的刺激作用的情况下，它被两种不同的生长素外排抑制剂阻断，并且在生长素外排突变体（pin 2/eir 1 -1）和iaa 7/axr 2 -1生长素不敏感突变体中不太明显。因此，似乎在低阿坝浓度下观察到的刺激作用是通过需要生长素信号传导和生长素通过PIN 2/EIR 1流出的乙烯非依赖性途径，而在高阿坝浓度下的抑制作用是通过需要生长素信号传导和生长素通过AUX 1流入的乙烯依赖性途径。
Exogenous abscisic acid (ABA) is known to either stimulate or inhibit root growth, depending on its concentration. In this study, the roles of ethylene and auxin in this biphasic effect of ABA on root elongation were investigated using chemical inhibitors and mutants. Inhibitors of ethylene perception and biosynthesis and an auxin influx inhibitor were all found to block the inhibitory effect of high ABA concentrations, but not the stimulatory effect of low ABA concentrations. In addition, three ethylene-insensitive mutants (etr1-1, ein2-1, and ein3-1), two auxin influx mutants (aux1-7, aux1-T) and an auxin-insensitive mutant (iaa7/axr2-1) were all insensitive to the inhibitory effect of high ABA concentrations. In the case of the stimulatory effect of low ABA concentrations, it was blocked by two different auxin efflux inhibitors and was less pronounced in an auxin efflux mutant (pin2/eir1-1) and in the iaa7/axr2-1 auxin-insensitive mutant. Thus it appears that the stimulatory effect seen at low ABA concentrations is via an ethylene-independent pathway requiring auxin signalling and auxin efflux through PIN2/EIR1, while the inhibitory effect at high ABA concentrations is via an ethylene-dependent pathway requiring auxin signalling and auxin influx through AUX1.
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影响因子：
64.8
作者：
Blilou, I;Xu, J;Scheres, B
通讯作者：
Scheres, B
影响因子：
5.3
作者：
Cramer GR;Urano K;Delrot S;Pezzotti M;Shinozaki K
通讯作者：
Shinozaki K
影响因子：
56.9
作者：
BLEECKER, AB;ESTELLE, MA;KENDE, H
通讯作者：
KENDE, H
影响因子：
7.4
作者：
CREELMAN, RA;MASON, HS;MULLET, JE
通讯作者：
MULLET, JE
影响因子：
2.3
作者：
Hammer, Graeme L.;Dong, Zhanshan;Cooper, Mark
通讯作者：
Cooper, Mark