Abstract:

Extreme high and low temperature seriously restricts the development of watermelon and melon industry, and the use of resistant rootstock grafting is an effective way to cope with high and low temperature disasters and achieve stress resistance and stable yield. In this paper, the germplasm of rootstocks, which were widely used in the watermelon and melon industry in Zhejiang Province, were used as the experimental materials. Germination indexes, seedling quality and relative values of each rootstock germplasm were measured by setting low temperature treatment at 15 ℃ and high temperature at 35 ℃, while 25 ℃ was set as a control. The results showed that low temperature treatment at 15 ℃ reduced the germination index and seedling quality of each rootstock germplasm, but there were significant differences among different germplasms. The low temperature tolerant watermelon and melon rootstock germplasm were screened out as Sizhuang 9 and Sizhuang 8, respectively. High temperature treatment at 35 ℃ reduced the germination index and seedling quality of melon rootstock germplasm, but the relative germination potential, relative germination rate and relative germination index of Sizhuang 8 were high, showing high temperature tolerance, so Sizhuang 8 was also a high temperature tolerant melon rootstock germplasm. High temperature stress only had a great effect on the germination index of watermelon rootstock Lvzhuangshi, and high temperature tolerant watermelon rootstock germplasm was selected as Sizhuang 9 and Sizhuang 10 based on the actual germination index, seedling quality and relative values.

Key words: watermelon, melon, rootstock, high temperature, low temperature, germplasm