Hormonal regulation in adventitious roots and during their emergence under waterlogged conditions in wheat.
Hormonal regulation in adventitious roots and during their emergence under waterlogged conditions in wheat.
复制标题
DOI：
10.1093/jxb/ery190
复制
发表时间：
2018-07-18
影响因子：
6.9
通讯作者：
Ayele BT
中科院分区：
文献类型：
--
作者：
Nguyen TN;Tuan PA;Mukherjee S;Son S;Ayele BT
小麦对渍水的适应是通过调节不定根及其出苗期间的激素代谢和运输来实现的。为了深入了解小麦不定根及其在淹水条件下出苗过程中激素调节的分子机制，本研究研究了根和茎节组织中与激素代谢和运输相关的基因的转录调控。淹水诱导抑制轴根伸长和侧根形成，促进表面不定根和轴根的出现和通风组织的形成，与乙烯生物合成基因ACS7和ACO2在这两个组织中的表达水平增强有关。中轴根伸长的抑制还与根吲哚乙酸(IAA)和茉莉酸(JA)水平的增加有关，这些水平与特定的IAA生物合成/运输(TDC、YUC1和PIN9)和JA代谢(LOX8、AOS1、AOC1和JAR1)基因的上调以及赤霉素(GA)代谢基因(GA3ox2和GA2ox8)的转录变化有关。淹水茎节不定根的发生与IAA和GA水平的升高以及细胞分裂素和脱落酸(ABA)水平的降低有关，而细胞分裂素和脱落酸(ABA)的表达受特定的IAA生物合成/运输(TDC、YUC1和PIN9)、细胞分裂素代谢(IPT5-2、LOG1、CKX5和ZOG2)、ABA生物合成(NCED1和NCED2)和GA代谢(GA3ox2和GA2ox8)基因的调控。这些结果加深了我们对小麦对内涝的适应性反应的分子机制的理解。
Acclimation of wheat to waterlogging is mediated by regulation of hormonal metabolism and transport in adventitious roots and during their emergence. To gain insights into the molecular mechanisms underlying hormonal regulation in adventitious roots and during their emergence under waterlogged conditions in wheat, the present study investigated transcriptional regulation of genes related to hormone metabolism and transport in the root and stem node tissues. Waterlogging-induced inhibition of axile root elongation and lateral root formation, and promotion of surface adventitious and axile root emergence and aerenchyma formation are associated with enhanced expression levels of ethylene biosynthesis genes, ACS7 and ACO2, in both tissues. Inhibition of axile root elongation is also related to increased root indole acetic acid (IAA) and jasmonate (JA) levels that are associated with up-regulation of specific IAA biosynthesis/transport (TDC, YUC1, and PIN9) and JA metabolism (LOX8, AOS1, AOC1, and JAR1) genes, and transcriptional alteration of gibberellin (GA) metabolism genes (GA3ox2 and GA2ox8). Adventitious root emergence from waterlogged stem nodes is associated with increased levels of IAA and GA but decreased levels of cytokinin and abscisic acid (ABA), which are regulated through the expression of specific IAA biosynthesis/transport (TDC, YUC1, and PIN9), cytokinin metabolism (IPT5-2, LOG1, CKX5, and ZOG2), ABA biosynthesis (NCED1 and NCED2), and GA metabolism (GA3ox2 and GA2ox8) genes. These results enhance our understanding of the molecular mechanisms underlying the adaptive response of wheat to waterlogging.
影响因子：
4.8
作者：
Arbona, Vicent;Gomez-Cadenas, Aurelio
通讯作者：
Gomez-Cadenas, Aurelio