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著者 | Jung YH, Agrawal GK, Rakwal R, Kim JA, Lee MO, Choi PG, Kim YJ, Kim MJ, Shibato J, Kim SH, Iwahashi H, Jwa NS. | |
タイトル | Functional characterization of OsRacB GTPase--a potentially negative regulator of basal disease resistance in rice. | |
Abstract: The rice genome contains at least seven expressed Rop small GTPase genes. Of these Rops, OsRac1 is the only characterized gene that has been implicated in disease resistance as a positive regulator. To our interest in finding a negative ROP regulator of disease resistance in rice, we applied a "phylogeny of function" approach to rice Rops, and identified OsRacB based on its close genetic orthologous relationship with the barley HvRacB gene, a known negative regulator of disease resistance. To determine the function of OsRacB, we isolated the OsRacB cDNA and conducted gene expression and transgenic studies. OsRacB, a single copy gene in the genome of rice, shared 98% identity with HvRacB at the amino acid level. Its mRNA was strongly expressed in leaf sheath (LS) and in panicles, but was very weakly expressed in young and mature leaves. The basal mRNA level of OsRacB in LS of two-week-old seedlings was strongly down-regulated upon wounding by cut and treatment with jasmonic acid. A dramatic down-regulation in the OsRacB transcripts was also found in plants inoculated with the blast pathogen, Magnaporthe grisea. Interestingly, transgenic rice plants over-expressing OsRacB showed increased symptom development in response to rice blast pathogens. Additionally, fluorescence microscopy of green fluorescent protein (GFP):OsRacB-transformed onion cells and Arabidopsis protoplasts revealed OsRacB association with plasma membrane (PM), suggesting that PM localization is required for proper function of OsRacB. Based on these results, we suggest that OsRacB functions as a potential regulator for a basal disease resistance pathway in rice. |
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掲載誌 | Plant Physiol. Biochem. | |
Country | South Korea | |
刊数 | 44(1) | |
ページ | 68-77 | |
発刊年 | 2006 | |
PubMed ID | 16531052 | |
PubMed Central ID | - | |
DOI | 10.1016/j.plaphy.2005.12.001 | |
URL | - | |
関連情報 | ||
遺伝子 | RAC1 RAC6 | |
INSD | - | |
系統 |
野生イネ コアコレクション |
- |
突然変異系統(遺伝研 Collection) | - | |
種子不稔系統 | - | |
致死変異体系統 | - | |
組織別発生段階 - 突然変異系統(遺伝子) |
- | |
栽培イネ品種(遺伝研 Collection) | - | |
組織別発生段階 | - |