OsMAPKKKε通过调节活性氧的积累来调控红豆杉顶端小穗的发育。

IF 4.2 2区生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY

Plant Science Pub Date : 2024-10-12 DOI:10.1016/j.plantsci.2024.112280

Weijiang Tian, Ziwei Peng, Xin Zhang, Yumeng Zheng, Yuanyuan Wang, Beiqi Feng, Yangyang Li, Guanghua He, Xianchun Sang

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引用次数: 0

摘要

水稻圆锥花序凋落会严重影响水稻产量和粮食安全。最新研究发现，圆锥花序流产既受环境因素的影响，也受特定基因的调控。在此，我们报道了一种新的圆锥花序顶端流产 4（paa4）突变体，该突变体具有半矮小和圆锥花序顶端流产表型，其流产发生在圆锥花序长度约为 7 厘米时。基于图谱的克隆发现，PAA4编码一种丝裂原活化蛋白激酶激酶ε（OsMAPKKKε）蛋白，OsMAPKKKε第19外显子中的G替换为A导致圆锥花序顶端凋萎。PAA4 在小穗中的表达量较高，但在水稻的所有器官中均有表达。在圆锥花序生长过程中，过量的活性氧（ROS）在 PAA4 的圆锥花序顶端积累，最终诱导细胞程序性死亡（PCD）。转录组测序表明，PAA4 在 ROS 的产生和消除过程中都发挥了作用。因此，PAA4 可能参与了顶端圆锥花序中 ROS 的平衡，进而影响了黑麦草的小穗发育。

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OsMAPKKKε regulates apical spikelet development by adjusting Reactive Oxygen Species accumulates in Oryza sativa

Rice panicle abortion can significantly impact rice yield and food security. Recent research has revealed that panicle abortion is influenced by environmental factors as well as regulated by specific genes. Here we report a novel panicle apical abortion 4 (paa4) mutant with semi-dwarf and panicle apical abortion phenotype, and its abortion occurs when the panicle length is approximately 7 cm. Map-based cloning has identified that PAA4 encodes a Mitogen-activated Protein Kinase Kinase Kinase ε (OsMAPKKKε) protein, and a substitution of G to A in exon 19 of OsMAPKKKε that leads to panicle apical abortion. PAA4 has a higher expression in the spikelet although which expressed in all organs of rice. During panicle growth, excessive Reactive Oxygen Species (ROS) accumulate in the apical panicle of paa4, eventually inducing programmed cell death (PCD). Transcriptome sequencing indicates that PAA4 plays a role in both the generation and elimination of ROS. Therefore, PAA4 might be involved in the balance of ROS at the apical panicle and then affects spikelet development in Oryza sativa.

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来源期刊

Plant Science 生物-生化与分子生物学

CiteScore

9.10

自引率

1.90%

发文量

322

审稿时长

33 days

期刊介绍： Plant Science will publish in the minimum of time, research manuscripts as well as commissioned reviews and commentaries recommended by its referees in all areas of experimental plant biology with emphasis in the broad areas of genomics, proteomics, biochemistry (including enzymology), physiology, cell biology, development, genetics, functional plant breeding, systems biology and the interaction of plants with the environment. Manuscripts for full consideration should be written concisely and essentially as a final report. The main criterion for publication is that the manuscript must contain original and significant insights that lead to a better understanding of fundamental plant biology. Papers centering on plant cell culture should be of interest to a wide audience and methods employed result in a substantial improvement over existing established techniques and approaches. Methods papers are welcome only when the technique(s) described is novel or provides a major advancement of established protocols.