Os10g0195600

The rice gene Os10g0195600 was reported as Spl18/OsAT1 in 2007^[1] by researchers from Japan.

Annotated Information

Overexpression of OsAT1 confers resistance to both fungal and bacterial pathogens.
OsAT1 may contribute to disease resistance by using its acyltransferase activity to potentiate disease-resistance signaling; alternatively it may act by producing phytoalexin-like secondary products such as BAHD enzymes. Monocot-specific group B proteins of the OsAT family may have monocot-specific important functions for disease resistance.

Spotted leaf 18 (Spl18) displayed lesion mimicry and resistance to blast disease.
Spotted leaf 18 (Spl18) mutant showed several diseaseresistance reactions, including transcriptional activation of PR protein genes, accumulation of two rice phytoalexins, and disease resistance for both blast and bacterial blight, suggesting that the disease-resistance signaling system was activated.
The transcriptional level of OsAT1 was very low in the WT leaf blade but high in Spl18 leaf blade.

Transcription of OsAT1 was not detected in the leaf blades of wild-type plants by Northern analysis but it was detected at very low levels by real-time quantitative RTPCR analysis. Relative expression level of OsAT1 in the wild type was set to 1 although the wild type DNA was not used for Southern analysis. To determine the tissue- and developmental stage-specific expression patterns of OsAT1, real-time quantitative RT-PCR analysis was performed. The OsAT1 mRNA level was normalized to an endogenous reference, rice ubiquitin (RUBQ2). OsAT1 transcripts were detected in all the organs examined in rice. The high level of expression was detected in the young panicle (<1 cm, 3–5 cm) and the panicle 1 day after heading; intermediate expression was seen in the young panicle (15 cm), the panicle 5 days after heading, and the leaf sheath. Expression levels were low in the leaf blade and root.

Fig. 7 Characterization of OsAT family. ^[1].

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National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan
College of Agriculture, Ibaraki University, Ami 300-0393, Japan
Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan

↑ ^1.0 ^1.1 Mori M, Tomita C, Sugimoto K, Hasegawa M, Hayashi N, Dubouzet JG, Ochiai H, Sekimoto H, Hirochika H, Kikuchi S. Isolation and molecular characterization of a Spotted leaf 18 mutant by modified activation-tagging in rice. Plant Mol Biol. 2007 Apr;63(6):847-60. PubMed PMID: 17273822.