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Cassava (Manihot esculenta Crantz) is the third largest food crop in the tropics and is the food ration of nearly 600 million people in the world. Cassava is mainly cultivated in tropical regions, where often damaged by waterlogging in rainy season, which leads to serious decline in yield and quality. Therefore, it is important for selecting cassava germplasm resources with high waterlogging-resistance. In this study, a pot experiment was carried out, and plant height increment, relative chlorophyll content (SPAD), relative conductivity, superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) of 28 cassava germplasm resources were measured under waterlogging stress treatment after 6 days. Variance, correlation analysis, principal component analysis and subordinate function analysis were used to evaluate waterlogging resistance and screen the waterlogging tolerant germplasms at the seedlings stage. The waterlogging tolerance of 28 cassava germplasms had great difference and the response mechanism of different cassava germplasms to waterlogging stress showed huge difference among the 28 germplasm resources. There were significant positive correlation between plant height increment and relative chlorophyll content (P<0.01), and the correlation coefficient was 0.253. There were negative correlation coefficient between the relative chlorophyll content with relative conductivity of 0.266 (P<0.01). Principal component analysis using 6 indexes indicated that the 4 principal components accounted for 82.85% of accumulative contribution rates among the germplasms. The main factors were CAT, plant height increment, SOD, and relative chlorophyll content, respectively. According to subordinate function analysis, waterlogging tolerance of the germplasms from high to low was Qiongzhong 1, SC6068, SC201, ME191, M-F532, GR891, C222, GR3, F2000, Luoyong 80, 46-12, GR5, KU58, H660, SC5, F03P, M-GR911, CH20, M-F671, COL713, Boss 2, JG1301, GR911, E407, F274, SC8, M-SC5, Thailand. The results of this study would provide basic materials for the breeding of new varieties of cassava with high waterlogging-tolerance and for the future research of cassava waterlogging tolerance mechanism.
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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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