Genes and Genomics

The Genetics Society of Korea (한국유전학회)
권호 표지

Characterization of Phenotypes of Rice Lesion Resembling Disease Mutants

Matin, Mohammad Nurul;Seo, Hak-Su;Gang, Sang-Gu
;서학수;강상구

  • Published : 20060000
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Abstract

Rice lesion resembling disease (lrd) mutants exhibit spontaneous cell death in the absence of any pathogenic infection and induce different types of spots on rice leaves (Oryza sativa L). We characterized the phenotypes of 11 rice mutant germplasms and classified them bl, bl2, spl3, spl4, spl5 and spl6 according to spot formation time, color, shape, size and distribution of spots on the surface of leaves. Tiny spots appeared at late tillering stage in 10 lrd mutant germplasms and these spots gradually grew in number up to maturity. This indicates that spot formation on leaves of lrd mutants was developmentally controlled. In contrast, spots of the bl2 mutant appeared at the seedling stage as relatively large round areas on the leaves, suggesting that the mechanism of bl2 spot formation may differ from that of other lrd mutants. The levels of rubisco large subunit (RuBC-L) and rubisco small subunit (RuBC-S) genes were lower in spotted leaves compared to non-spotted leaves of lrd mutants. However, RNA transcripts of both RuBC-S and catalase were severely degraded on the spotted leaves of the spl5 mutant. This implies that the gene that causes the spl5 mutant might be involved in nuclear necrosis. Based on these results, lrd genes may play a role in developmental processes and defense against pathogens.

Keywords

References

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