Qilang Wei1, Zhenwei Yan2, Yifan Xiong3, Zhongming Fang1,3. 1. Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Agricultural Sciences, Guizhou University, Guiyang 550025, China. 2. Xiamen Plant Genetics Key Laboratory, School of Life Sciences, Xiamen University, Xiamen 361102, China. 3. Hubei Engineering Research Center of Viral Vector, Wuhan University of Bioengineering, Wuhan 430415, China.
Abstract
Persistent lesion mimic can cause leaf senescence, affecting grain yield in crops. However, knowledge about the regulation of lesion mimic and leaf senescence in crop plants is still limited. Here, we report that the amino acid transporter OsAAP3, a negative regulator of tiller bud elongation and rice grain yield, is involved in lesion mimic and leaf senescence. Altered expression of OsAAP3 can initiate the nitric oxide signaling pathway through excessive accumulation of arginine in rice leaves, influencing ROS accumulation, antioxidant enzymes activities, proline concentration, and malondialdehyde concentration. This finally triggers cell death which ultimately leads to lesion mimic and leaf senescence by regulating the degradation of chloroplast and the expression abundance of components in the photosynthetic pathway. Overall, the results not only provide initial insights into the regulatory role of amino acid transport genes in rice growth and development, but also help to understand the factors regulating the leaf senescence.
Persistent lesion mimic can cause leaf senescence, afpan class="Chemical">fecting grain yield in cropn>s. However, knowledge about the regulation of lesion mimic and leaf senescence in cropn> plants is still limited. Here, we report that the amino acid transpn>orter OsAAP3, a negative regulator of tiller bud elongation and n>an class="Species">rice grain yield, is involved in lesion mimic and leaf senescence. Altered expression of OsAAP3 can initiate the nitric oxide signaling pathway through excessive accumulation of arginine in rice leaves, influencing ROS accumulation, antioxidant enzymes activities, proline concentration, and malondialdehyde concentration. This finally triggers cell death which ultimately leads to lesion mimic and leaf senescence by regulating the degradation of chloroplast and the expression abundance of components in the photosynthetic pathway. Overall, the results not only provide initial insights into the regulatory role of amino acid transport genes in rice growth and development, but also help to understand the factors regulating the leaf senescence.
Authors: D F Klessig; J Durner; R Noad; D A Navarre; D Wendehenne; D Kumar; J M Zhou; J Shah; S Zhang; P Kachroo; Y Trifa; D Pontier; E Lam; H Silva Journal: Proc Natl Acad Sci U S A Date: 2000-08-01 Impact factor: 11.205
Authors: Elisa Zago; Stijn Morsa; James F Dat; Philippe Alard; Alberto Ferrarini; Dirk Inzé; Massimo Delledonne; Frank Van Breusegem Journal: Plant Physiol Date: 2006-04-07 Impact factor: 8.340