Lysigenous aerenchyma formation in maize root is confined to cortical cells by regulation of genes related to generation and scavenging of reactive oxygen species

被引：52
|
作者：
Yamauchi, Takaki [1 ]
Rajhi, Imene [1 ]
Nakazono, Mikio [1 ,2 ]
机构：
[1] Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo, Japan
[2] Nagoya Univ, Grad Sch Bioagr Sci, Nagoya, Aichi, Japan
来源：
PLANT SIGNALING & BEHAVIOR | 2011年 / 6卷 / 05期
关键词：
aerenchyma; ethylene; laser microdissection; maize (Zea mays); metallothionein; programmed cell death; reactive oxygen species; respiratory burst oxidase homolog;
D O I：
10.4161/psb.6.5.15417
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
To adapt to waterlogging, maize (Zea mays) forms lysigenous aerenchyma in root cortex as a result of ethylene- promoted programmed cell death (PCD). Respiratory burst oxidase homolog (RBOH) gene encodes a homolog of gp91(phox) in NADPH oxidase, and has a role in the generation of reactive oxygen species (ROS). Recently, we found that during aerenchyma formation, RBOH was upregulated in all maize root tissues examined, whereas an ROS scavenging-related metallothionein (MT) gene was downregulated specifically in cortical cells. Together these changes should lead to high accumulations of ROS in root cortex, thereby inducing PCD for aerenchyma formation. As further evidence of the involvement of ROS in root aerenchyma formation, the PCD was inhibited by diphenyleneiodonium (DPI), an NADPH oxidase inhibitor. Based on these results, we propose a model of cortical cell-specific PCD for root aerenchyma formation.
引用
收藏
页码：759 / 761
页数：3
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