| Evaluation methods on watermelon drought resistance on the basis of GGE biplot |
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| DOI：10.7606/j.issn.1000-7601.2017.01.35 |
| Key Words: watermelon drought resistance GGE-bioplot evaluation method |
| Author Name | Affiliation | | SUN Xiao-mei | Gansu Agricultural University, Gansu Key Laboratory of Arid habitats Crop Science, Lanzhou, Gansu 730070, China | | CHEN Jing-jing | Gansu Agricultural University, Gansu Key Laboratory of Arid habitats Crop Science, Lanzhou, Gansu 730070, China | | CHEN Nian-lai | Gansu Agricultural University, Gansu Key Laboratory of Arid habitats Crop Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field investigation with seven watermelon genotypes was conducted under three soil moisture levels, and the yield and its components were determined. The yield drought-resistance coefficients were calculated using seven evaluation methods. On the basis of principal component analysis and the correlations among the drought-resistance evaluation methods, the identification indexes were analyzed by GGE-bioplot. The results showed that the fruit yield was decreased as soil moisture became reduced, and the extents varied within genotypes. Clear traits trade-off was found between fruit weight and fruit number per plant in varieties with higher drought resistance. For example, genotypes 238 and Xinongbahao with high fruit number per plant will have low fruit weight. However, traits trade-off was not found in drought sensitive genotypes. The results obtained from genotype comparisons using yield based GGE-bioplot were similar to the known drought-resistant abilities of the genotypes. Based on the yield, YSI (yield stability index), DRI (drought resistant index), MP (mean productivity), STI (stress tolerance index) and GMP (geometric mean productivity) were selected as the suitable drought evaluation indexes under water stress after GGE-biopolt analysis. MP, STI and GMP belonged to the same category, and YSI and DRI were in the other category. The results imply an important theoretical significance in guiding the screening of drought resistant watermelon germplasms and the identification of drought resistance of watermelon cultivars. |
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