The roles of phytochromes in elongation and gravitropism of roots
The roles of phytochromes in elongation and gravitropism of roots
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DOI：
10.1093/pcp/pci038
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发表时间：
2005-02-01
影响因子：
4.9
通讯作者：
Kiss, JZ
中科院分区：
文献类型：
--
作者：
Correll, MJ;Kiss, JZ
黄化下胚轴的向重力定向和伸长都是通过光感受器的光敏色素家族由红光调节的。光敏色素A和B（phyA和phyB）在这些红光响应中的重要性已经通过使用phy突变体的研究确定。为了明确光敏色素在植物向重力性和根伸长过程中的作用，我们研究了红光对拟南芥光敏色素突变体（phyA、phyB、phyD和phyAB）根伸长的影响，并比较了它们与野生型的向重力性曲率。我们发现，红光抑制根伸长约35%的黄化苗，这种反应是由光敏色素。根从黑暗和光生长的双突变体（phyAB）和光生长的phyB幼苗与野生型相比，延长率降低。此外，根从这些幼苗（黑暗/光生长的phyAB和光生长的phyB）有减少率的向重力弯曲与野生型相比。这些结果表明光敏色素在调节根的伸长和向重力弯曲方面的作用。
Gravitropic orientation and the elongation of etiolated hypocotyls are both regulated by red light through the phytochrome family of photoreceptors. The importance of phytochromes A and B (phyA and phyB) in these red light responses has been established through studies using phy mutants. To identify the roles that phytochromes play in gravitropism and elongation of roots, we studied the effects of red light on root elongation and then compared the gravitropic curvature from roots of phytochrome mutants of Arabidopsis (phyA, phyB, phyD and phyAB) with wild type. We found that red light inhibits root elongation approximately 35% in etiolated seedlings and that this response is controlled by phytochromes. Roots from dark- and light-grown double mutants (phyAB) and light-grown phyB seedlings have reduced elongation rates compared with wild type. In addition, roots from these seedlings (dark/light-grown phyAB and light-grown phyB) have reduced rates of gravitropic curvature compared with wild type. These results demonstrate roles for phytochromes in regulating both the elongation and gravitropic curvature of roots.