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Eight main agronomic traits were statistically analyzed using cassava germplasm resources. The result showed that the data for the eight agronomic traits were normally distributed, with the coefficients of variation ranging from 7.2% to 46.9%. The coefficient of variation for starch yield was 46.9% and the coefficient of variation for the dry matter rate was 7.2%. Correlation analysis showed that there was a degree of significant positive correlation between the different traits, with a highly significant positive correlation between weight of fresh tuberous root per plant and stem diameter. Principal component analysis combined eight traits into three main components. The cumulative contribution rates in each year amounted to 92.55% and 93.67%, respectively. The first principal components were weight of fresh tuberous root per plant, fresh tuberous root yield, starch yield and dry tuberous root yield. The second principal components were starch content and dry matter. Cluster analysis suggested that the resources could be divided into four groups in each year at the Euclidean distance of 6.0. Group Ⅱ had excellent performances in weight of fresh tuberous root per plant, fresh tuberous root yield, starch yield and dry tuberous root yield, which could be preferred as parental materials for new cassava varieties selection and breeding of high yield and good quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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