生物
茉莉酸
格里斯麦格纳波特
水稻
脱落酸
麦格纳波特
过氧化物酶
水杨酸
乙烯利
冈田酸
生物化学
信号转导
磷酸酶
细胞生物学
基因
酶
乙烯
催化作用
作者
Ganesh Kumar Agrawal,Nam‐Soo Jwa,Hitoshi Iwahashi,Randeep Rakwal
出处
期刊:Gene
[Elsevier]
日期:2003-12-01
卷期号:322: 93-103
被引量:83
标识
DOI:10.1016/j.gene.2003.08.017
摘要
We have identified and characterized two rice ascorbate peroxidase (OsAPX1 and OsAPX2) genes against diverse signals known to involve in defense/stress responses, using "2-week-old rice seedling in vitro model system". Oryza sativa ascorbate peroxidase 1 and 2 (OsAPX1/2) share 83% similarity to each other at amino acid level and belong to a small gene family in the rice genome. OsAPX1/2 show a weak constitutive expression in leaves. Their transcripts were up-regulated upon wounding (by cut), and diverse signals such as salicylic acid (SA), ethylene (using the ethylene generator, ethephon), abscisic acid (ABA), hydrogen peroxide, copper sulfate, protein phosphatase (PP) inhibitors, cantharidin (CN), endothall (EN) and okadaic acid (OA), and blast pathogen (Magnaporthe grisea) attack, but surprisingly not by jasmonic acid (JA). Interestingly, the OsAPX2 inductions were more potent and rapid than OsAPX1, whose expression increased gradually with time. These inductions were influenced by light signal(s), and showed requirement for certain de novo synthesized protein factor(s). Intriguingly, OsAPX1/2 mRNAs expression manifested a clear rhythmicity under light/dark cycle. Differential regulation of the OsAPX1/2 expressions by diverse environmental cues, including pathogen, and their developmental regulation in both young and reproductive stages strongly suggests their role in stress-signaling pathways and development in rice.
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