This work intended to characterize the seed morphology, water absorption patterns and to determine the vigor among different colored seeds of the species Centrolobium paraense （Fabaceae）. For this purpose, samaras w...This work intended to characterize the seed morphology, water absorption patterns and to determine the vigor among different colored seeds of the species Centrolobium paraense （Fabaceae）. For this purpose, samaras which were opened were collected from two sites---Agua Boa （AB） and Taiano （TAI） lo^ated in the state of Roraima, and the seeds screened by the coat coloration （light brown/intermediate brown/dark brown） for four conditions （two sites and two years of collection）. Evaluation of water absorption by the seeds at different periods, mass of 1,000 seeds, water content, electrical conductivity （EC）, seedling emergence and emergence velocity （EV） were performed. The water absorption by the seeds of Centrolobium paraense indicates coat permeability to water and distinct absorptions according to coat colorations. The EC test is efficient in determining the physiological quality of seeds of Centrolobium paraense. Seed coat coloration affects the physiological quality of the seeds of Centrolobium paraense. It is possible to distinguish the seeds of AB and TAI into two degrees of physiological quality, the light brown-colored seeds being more vigorous.展开更多
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 gree...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).展开更多
文摘This work intended to characterize the seed morphology, water absorption patterns and to determine the vigor among different colored seeds of the species Centrolobium paraense （Fabaceae）. For this purpose, samaras which were opened were collected from two sites---Agua Boa （AB） and Taiano （TAI） lo^ated in the state of Roraima, and the seeds screened by the coat coloration （light brown/intermediate brown/dark brown） for four conditions （two sites and two years of collection）. Evaluation of water absorption by the seeds at different periods, mass of 1,000 seeds, water content, electrical conductivity （EC）, seedling emergence and emergence velocity （EV） were performed. The water absorption by the seeds of Centrolobium paraense indicates coat permeability to water and distinct absorptions according to coat colorations. The EC test is efficient in determining the physiological quality of seeds of Centrolobium paraense. Seed coat coloration affects the physiological quality of the seeds of Centrolobium paraense. It is possible to distinguish the seeds of AB and TAI into two degrees of physiological quality, the light brown-colored seeds being more vigorous.
基金supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China(Class tutors,Grant No.20114320110008)the Scientific Research Fund of Hunan Provincial Education Department,China(Grant No.11A052,No.12JJ4028)Inquiry Learning and Innovative Experiment Projects of Hunan Provincial Undergraduate(SCX1219)
文摘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).
