Identification and Genetic Mapping of a Lesion Mimic Mutant in Rice

A lesion mimic stripe mutant,designated as lms1(lesion mimic stripe 1),was obtained from the M2 progeny of a 60Co γ-radiation treated japonica rice variety Jiahua 1.The lms1 mutant displayed propagation type lesions across the whole growth and developmental stages.Physiology and histochemistry analysis showed that the mutant exhibited a phenotype of white stripe when grown under high temperature(30 ℃),and the lesion mimic caused by programmed cell death under low temperature(20 ℃).The genetic analysis indicated that this lesion-mimic phenotype is controlled by a single locus recessive nuclear gene.Furthermore,by using simple sequence repeat markers and an F2 segregating population derived from two crosses of lms1 × 93-11 and lms1 × Pei'ai 64S,the lms1 gene was mapped between markers Indel1 and MM0112-4 with a physical distance of 400 kb on chromosome 6 in rice.