MtPIN1 and MtPIN3 Play Dual Roles in Regulation of Shade Avoidance Response under Different Environments in Medicago truncatula.
MtPIN1 and MtPIN3 Play Dual Roles in Regulation of Shade Avoidance Response under Different Environments in Medicago truncatula.
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MtPIN1和MtPIN3在蒺藜苜蓿不同环境下的避荫反应调节中发挥双重作用。
DOI：
10.3390/ijms21228742
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发表时间：
2020-11-19
影响因子：
5.6
通讯作者：
Zhou C
中科院分区：
文献类型：
--
作者：
Zhang X;Liu L;Wang H;Gu Z;Liu Y;Wang M;Wang M;Xu Y;Shi Q;Li G;Tong J;Xiao L;Wang ZY;Mysore KS;Wen J;Zhou C
PIN蛋白介导的生长素极性运输对植物生长发育至关重要。遮荫作为一种环境信号，通过诱导生长素的合成和不对称分布来刺激下胚轴、叶柄和茎的伸长，而这一过程在拟南芥中受到PIN3，4，7的调控。在这里，我们的特点MtPIN 1和MtPIN 3，这是直系同源的PIN 3，4，7，在模式豆科植物蒺藜苜蓿。在低红：远红（R：FR）比的光照下，MtPIN1和mtpin3双突变体的MtPIN 1和MtPIN 3的表达被诱导，避荫反应被破坏，表明MtPIN 1和MtPIN 3在避荫反应中具有保守的功能。在正常生长条件下，mtpin1和mtpin3表现出组成型避荫反应，如叶柄伸长、叶片变小、生长素和叶绿素含量增加等。因此，MtPIN1和MtPIN3在不同环境下对避荫反应的调节中具有双重作用。此外，这些数据表明，PIN 3，4，7及其直系同源物在物种之间进化了保守和特定的功能。
Polar auxin transport mediated by PIN-FORMED (PIN) proteins is critical for plant growth and development. As an environmental cue, shade stimulates hypocotyls, petiole, and stem elongation by inducing auxin synthesis and asymmetric distributions, which is modulated by PIN3,4,7 in Arabidopsis. Here, we characterize the MtPIN1 and MtPIN3, which are the orthologs of PIN3,4,7, in model legume species Medicago truncatula. Under the low Red:Far-Red (R:FR) ratio light, the expression of MtPIN1 and MtPIN3 is induced, and shadeavoidance response is disrupted in mtpin1 mtpin3 double mutant, indicating that MtPIN1 and MtPIN3 have a conserved function in shade response. Surprisingly, under the normal growth condition, mtpin1 mtpin3 displayed the constitutive shade avoidance responses, such as the elongated petiole, smaller leaf, and increased auxin and chlorophyll content. Therefore, MtPIN1 and MtPIN3 play dual roles in regulation of shadeavoidance response under different environments. Furthermore, these data suggest that PIN3,4,7 and its orthologs have evolved conserved and specific functions among species.
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