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Outline
To screen oat (Avena sativa L.) germplasm resources suitable for cultivation in saline-alkali soil and to establish a scientific and efficient salt tolerance evaluation system, 70 oat germplasm resources were used as test materials. NaCl solution was employed to simulate the salt stress environment. Six indices related to germination and seedling growth including relative germination potential, relative germination rate, and relative vigor index were systematically measured. The salt tolerance of the oat germplasms was comprehensively evaluated through principal component analysis and cluster analysis. The results indicated that salt stress significantly affected the seed germination and seeding growth of the 70 tested oat materials, with the coefficient of variation for each index ranging from 26.04% to 68.66%. Principal component analysis(PCA) transformed the six individual indices into two comprehensive factors with a cumulative contribution rate of 86.66%. The first principal component showed high loadings on relative germination potential, relative germination rate, and relative germination index, reflecting the germination potential of seeds under salt stress; the second principal component was correlated with relative root length and relative seedling length, reflecting the growth tolerance of seedlings to salt stress. Based on the cluster analysis of weighted membership function values(D values), the 70 oat germplasm resources were classified into five categories: 6 with highly salt-tolerance(Zishouziyuan 3, Zishouziyuan 14, Wuyou 1, Zishouziyuan 25, Bayan 4 and Pinyan 4), 23 with salt-tolerance, 12 with moderate salt-tolerance, 21 with salt-sensitivity, and 8 with highly salt-sensitivity. Through the optimal regression equation established, relative germination rate and relative vitality index were identified as the key indicators for evaluating oat salt tolerance at the germination stage. Comparative analysis revealed that hulled oat(Avena sativa L.) generally exhibited greater salt tolerance than hulless oat(Avena nuda L.).
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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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