| Comprehensive evaluation of deep\|sowing tolerance of 34 sorghum cultivars by principal component analysis and subordinate function method |
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| DOI：10.7606/j.issn.1000-7601.2020.02.30 |
| Key Words: sorghum cultivars deep\|sowing tolerance germination characteristics comprehensive evaluation |
| Author Name | Affiliation | | ZHOU Yu | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | HUANG Juan | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | WU Yu | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | ZHANG Yaqin | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | XI Jiang | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | ZHANG Xiaochun | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China | | LI Zebi | Institute of Characteristic Crops Research, Chongqing Academy of Agricultural Sciences, Yongchuan, Chongqing 402160, China |
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| Abstract: |
| In order to evaluate the deep\|sowing tolerance of sorghum cultivars and screen related identification index, we measured the emergence rate, seedling morphology, and dry weight of 34 sorghum cultivars with different sowing depths of 1, 3, 5, and 7 cm by a pot experiment. The results showed that with the increase in sowing depth, the emergence rate, seedling length, root length, root number, and seedling dry weight decreased with the relative value ranging between 0.84~0.60, 0.96~0.75, 0.83~0.53, 0.88~0.64, and 0.95~0.85, respectively. Mesocotyl length, root dry weight, and root\|shoot ratio increased by the relative value ranges of 1.52~3.30, 1.10~1.25, and 1.17~1.50, respectively, while the coleoptiles length had no significant difference among sowing depths. Principal component analysis (PCA) showed that the cumulative contribution rate of the first 4 principal components was 77.647%, and the relative root\|shoot ration, relative root length, relative mesocotyl length, and emergence rate had the maximum weight in values. These 4 traits above were used as the main indices for evaluating deep\|sowing tolerance and to calculate subordinate function values. According to the cluster analysis of sorghum varieties based on the subordinate function values, 3 groups of deep\|sowing tolerance of 34 sorghum cultivars were detected: 11 cultivars including Jinliangbai 2 were deep\|sowing tolerant, 14 cultivars including Hongqingke were medium deep\|sowing tolerant, and 9 cultivars including Jipin 609 were deep\|sowing sensitive. In conclusion, the difference of deep\|sowing tolerance among sorghum cultivars was distinct, and the tolerance of hybrids was higher than that of conventional cultivars. |
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