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Identification of aphid resistance and correlation with physical characters of leaf in watermelon seedlings

Zhang, X., Wu, M. M., Yang, X. Z., Wang, Y. Q., Liu, L. H., Li, X. L.
Acta horticulturae 2017 no.1151 pp. 259-266
Aphis gossypii, correlation, crops, germplasm, laboratory experimentation, leaves, pests, plant viruses, seedlings, stomata, watermelons
Watermelon is one of the most economically important agricultural crops all over the world. Aphis gossypii Glover is one of the major pests to feed on watermelon, not only resulting in a loss of yield and quality, but also as an important vector promoting plant viruses spread. To excavate excellent, anti-aphid watermelon germplasm, 21 germplasms were identified by combining of field and laboratory test. The aphid resistance in field test were roughly consistent with that in laboratory test. Watermelon germplasms with different resistance were identified including 'ZXG01018' and 'Zhenmu 4' with moderate resistance, 'ZXG00960' and 'M08' with low resistance, '134' and 'Y1-1' with sensitivity, 'Y1-3', 'Zhong10 haikang' and 'Jinmeiren1' with high sensitivity. Compared to susceptive germplasms ('Zhong 10 haikang', '148'), the stomata density of resistant germplasms ('Zhenmu 4', 'KY-2') were significantly lower, but the density of leaf hair and the content of leaf epidermis wax in resistant germplasms were remarkably higher. The index of aphid susceptibility was significantly, positively correlated with stomata density, but negatively correlated with the density of leaf hair and the content of leaf epidermis wax. In summary, the density of hair and stoma could be as the standard of watermelon resistance to aphids, as so as the wax content.