Studies on the Correlation between Germination and cAMP Content of Different Color Chlamydospores in

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Ustilaginoidea virens is the causal agent of a serious disease of rice. To reveal the relationship between germination and the 3’-5’-cyclic adenosine monophosphate(c AMP) content from the dormant(black or green-black) and non-dormant(yellow)chlamydospore in Ustiloginoidea virens,this study adopts ultrasonic-bath method and high-performance liquid chromatography(HPLC) method, for extraction c AMP content of the different color chlamydospore. The results demonstrated that, as for the freshly chlamydospores collected from the false smut balls during their germination, c AMP content of yellow chlamydospore appeared a slight growth during 0-12 h, and showed a rapid declining as the germination time extended(12-48 h). Above all, in yellow chlamydospores, the germination rate and the content of c AMP presented a very notably negative correlation(|r|=0.861 9>r0.01=0.834), but the correlation between germination rate and content of c AMP was not obvious in black chlamydospores. The germination rate and the content of c AMP presented a notably positive correlation under different storage period(0, 2, 4, 6, 8,10 months) of the two color chlamydospores(the yellow of chlamydospore: |r | = 0.785 1 > r0.05= 0.707; the black of chlamydospore: |r| = 0.957 9 > r0.05= 0.707). Ustilaginoidea virens is the causal agent of a serious disease of rice. To reveal the relationship between germination and the 3’-5’-cyclic adenosine monophosphate (c AMP) content from the dormant (black or green-black) and non-dormant yellow) chlamydospore in Ustiloginoidea virens, this study employing ultrasonic-bath method and high-performance liquid chromatography (HPLC) method, for extracting c AMP content of the different color chlamydospore. The results form that, as for the freshly chlamydospores collected from the false smut balls during their germination, c AMP content of yellow chlamydospore had a slight growth during 0-12 h, and showed a rapid declining as the germination time extended (12-48 h). Above all, in yellow chlamydospores, the germination rate and the content of c AMP presented a very notably negative correlation (| r | = 0.861 9> r0.01 = 0.834), but the correlation between germination rate and content of c AMP was not obvious in black chlamydospores. The germination rate and the content of c AMP presented a notably positive correlation under different storage period (0, 2, 4, 6, 8, 10 months) of the two color chlamydospores (the yellow of chlamydospore: | r | = 0.785 1> r0. 05 = 0.707; the black of chlamydospore: | r | = 0.957 9> r0.05 = 0.707).
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