Response of Watermelon Plants Grafted onto Different Cucurbit Rootstocks to Sub-Optimal Growing Temperature | ||
| Hortscience Journal of Suez Canal University | ||
| Article 3, Volume 7, Issue 2, September 2018, Pages 25-34 PDF (736.76 K) | ||
| DOI: 10.21608/hjsc.2018.59095 | ||
| Abstract | ||
| This study was conducted to examine the relative tolerance of grafted watermelon to sub-optimal growing temperature conditions. Watermelon cv. Aswan scions were grafted onto different rootstocks, namely Giada, Shintoza, StrongToza, and Ferro. Grafted and un-grafted seedlings were grown in the field under low temperature during Jan.-Apr. to be compared to those growing under normal warm season conditions (Mar.-Jun.). Results indicated significant decrease in growth, yield, chlorophyll, and carotenoids in all grafted plants, in different degrees, depending on the graft combination. In this regards, plants of Aswan/Ferro recorded more than double the marketable yield of un-grafted ones under sub-optimal temperature, indicating the relative tolerance of Aswan/Ferro to cold stress. While, un-grafted plants exhibited the highest decline in all growth and yield parameters. Leaf proline content and the activities of anti-oxidant enzymes (SOD and CAT) were higher under cold stress than the control. It is concluded that grafted watermelon plants were relatively tolerant to sub-optimal temperature than un-grafted ones which could enable the production of out of season crop. | ||
| Keywords | ||
| Citrullus lanatus; grafting; rootstocks; cold stress; iso-enzymes | ||
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