A Study of Physiological and Biochemical Changes in Flowering and Non-flowering Potatoes
The differences in the physiological and biochemical properties of flowering and non-flowering potatoes were studied to explore the relationship between the changes in these properties and flower bud differentiation.In this study,two flowering varieties of YS205,HZ88 and non-flowering variety YS304 were taken as materials,the enzyme activity of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT) and carbohydrates contents were tested in the early stage of flower bud differentiation,initial flowering stage,flowering stage and late flowering stage of potato leaves.The results indicated that,among the three varieties,the soluble protein content rose was upward after a decline,especially YS304,the rising and falling speed was great.The content of starch and soluble sugar increased while those of YS304 tended to be gentle.The activity of SOD in the three cultivars increased, YS304 was the fastest.The POD and CAT activities of leaves were upward after a decline,which YS304 and it was the highest at the initial flowering stage,then decreased rapidly.In the flowering stage,carbohydrates were mainly distributed in bud,which had the lowest SOD and highest POD and CAT activities compared with those in leaves and petals,it indicated that the bud was the main supplying part of the assimilation products.In a word,highter accumulation of starch and soluble sugar contents was helpful to flower bud differentiation,but the higher protein content might not be the case.The enzymes activity of YS304 was higher than that of flowering varieties YS205 and HZ88 in the early stage of flower bud differentiation,but still did not promote flowering.It showed that whether flowering or not was affected greatly by the contents of starch and soluble sugar in the leaves.
国家科技期刊平台
NSTL
万方数据
维普
