The spread of tissue necrosis leads to plant death. We isolated 18 lethal necrotic mutants induced in rice ( Oryza sativa L.) by gamma-irradiation. The necrotic lethality among the 18 mutants was controlled by single recessive genes designated necrotic lethality 1 ( nec 1) to nec 1 8 . These mutants display pale-green leaves from the third-leaf stage and leaf-tip necrosis, which spreads to the whole plant, killing it. Genetic mapping and histochemical analysis of the lethal necrotic mutants were conducted. At least four independent loci on chromosomes 2 and 4 controlled necrotic lethality. Therefore, the genetic causes of lethal necrosis vary among mutant stocks. Histochemical analysis at 12 days after sowing showed that H 2 O 2 accumulated in the necrotic parts of leaves, and that cell death occurred throughout the leaf. Mutants for early necrotic lethality (<24 days to lethality) were characterized by the rapid spread of H 2 O 2 accumulation throughout the third leaf. Mutants for late necrotic lethality (>35 days to lethality) were characterized by the incomplete spread of H 2 O 2 accumulation within the third leaf.
KeywordsRiceMutantNecrotic LethalityLinkage MappingReactive Oxygen Species
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