Phytohormones signaling and crosstalk regulating leaf angle in rice.
Leaf angle is an important agronomic trait in rice (Oryza sativa L.). It affects both the efficiency of sunlight capture and nitrogen reservoirs. The erect leaf phenotype is suited for high-density planting and thus increasing crop yields. Many genes regulate leaf angle by affecting leaf structure, such as the lamina joint, mechanical tissues, and the midrib. Signaling of brassinosteroids (BR), auxin (IAA), and gibberellins (GA) plays important roles in the regulation of lamina joint bending in rice. In addition, the biosynthesis and signaling of BR are known to have dominant effects on leaf angle development. In this review, we summarize the factors and genes associated with the development of leaf angle in rice, outline the regulatory mechanisms based on the signaling of BR, IAA, and GA, and discuss the contribution of crosstalk between BR and IAA or GA in the formation of leaf angle. Promising lines of research in the transgenic engineering of rice leaf angle to increase grain yield are proposed.
School of Life Sciences, Xiamen University, Xiamen, 361005, China.
Xiangyu
X
Luo
School of Life Sciences, Xiamen University, Xiamen, 361005, China.
Jingsheng
J
Zheng
School of Life Sciences, Xiamen University, Xiamen, 361005, China.
Rongyu
R
Huang
School of Life Sciences, Xiamen University, Xiamen, 361005, China.
Yumin
Y
Huang
School of Life Sciences, Xiamen University, Xiamen, 361005, China.
Houcong
H
Wang
School of Life Sciences, Xiamen University, Xiamen, 361005, China. lrjiang108@xmu.edu.cn.
Liangrong
L
Jiang
Institute of Life Sciences, Jiyang College of Zhejiang, A&F University, Zhuji, 311800, China. jim.xj.fang@hitar.org.|Hainan Institute of Tropical Agricultural Resources, Sanya, 572025, China. jim.xj.fang@hitar.org.
Xuanjun
X
Fang
D001696:Biomechanical Phenomena; D008954:Models, Biological; D012275:Oryza / Q000033:anatomy & histology* / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism*; D018515:Plant Leaves / Q000033:anatomy & histology* / Q000378:metabolism*; D015398:Signal Transduction
D010937:Plant Growth Regulators
Crosstalk; Leaf angle; Oryza sativa L.; Phytohormones; Rice