Abstract:

This study systematically evaluated the graft compatibility between watermelon variety Jingjia 301 and bottle gourd rootstocks（Jingxinzhenzhuang and Jingxinzhendi），pumpkin rootstocks（Jingxinzhen 3 and Sizhuang 7），and wild watermelon rootstock （Yezhuang 1）. The experiment was conducted in a continuous-cropping watermelon greenhouse in Yuhang District，Hangzhou City，Zhejiang Province，with comprehensive comparisons of the performance of different rootstocks. The results showed that the wild watermelon rootstock Yezhuang 1 exhibited the highest grafting survival rate（93.33%）and the lowest malformed fruit rate（24.73%），with a superior central sugar content（13.4%）compared with the controlled seedlings，but weaker resistance to leaf spot disease. Although pumpkin rootstocks could promote an increase in internode number，their grafting survival rate and disease resistance were relatively poor. Bottle gourd rootstocks performed outstandingly in terms of single fruit weight and resistance to wilt disease. In summary，the wild watermelon rootstock Yezhuang 1 demonstrated significant advantages in ensuring grafting survival rate and optimizing fruit quality，making it a suitable and excellent rootstock for Jingjia 301. However，the type of rootstock should also be selected in a targeted manner based on the local climate and disease conditions.

Key words: watermelon, grafting combinations, Jingjia 301, fruit quality, disease resistance