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Growth and Development of Watermelon Plants Grafted onto $Citrullus$ Rootstocks with Resistance to Fusarium Wilt at Two Temperature Regimes  

Ko, Ho-Cheol (National Academy of Agricultural Science, RDA)
Lee, Woo-Moon (National Institute of Horticultural & Herbal Science, RDA)
Noh, Jae-Jong (Jeollabuk-do Agricultural Research & Extension Services)
Park, Kyoung-Sub (National Institute of Horticultural & Herbal Science, RDA)
Park, Dong-Kum (National Institute of Horticultural & Herbal Science, RDA)
Ko, Kwan-Dal (National Institute of Horticultural & Herbal Science, RDA)
Lee, Jung-Myung (Dept. of Horticulture, KyungHee University)
Huh, Yun-Chan (National Academy of Agricultural Science, RDA)
Publication Information
Journal of Bio-Environment Control / v.21, no.1, 2012 , pp. 33-38 More about this Journal
Abstract
Growth response of 'Sambokkul' watermelon grafted onto different rootstocks including 4 $Citrullus$ rootstocks and 3 other cucurbitaceous rootstocks was evaluated at two different temperature regimes. Significant reduction in plant growth rate was observed in plants grown at low temperatures (LT) as compared to those grown at normal or optimal temperatures. Relative growth reduction were 40~47% for vine length, 39~51% for total leaf area, 38~59% for shoot fresh weight, and 57~87% for plant dry weight, respectively. Watermelon rootstock PI 482322 showed comparable plant growth as the most popular rootstock 'Shintozwa' even at LT. 'Sambokkul' watermelon grafted onto watermelon hybrids, 'PI 271969 ${\times}$ PI 296341' and 'PI 271769 ${\times}$ Calhoun Gray', showed comparable plant growth as 'FR Dantos' bottle gourd rootstock. Index of growth ability at LT, which was calculated on the basis of reduced rate of vine length, dry weight and leaf area, was significantly high in $C.$ $martinezii$, 'Shintozwa', PI 482322, and 'PI 271769 ${\times}$ PI 296341' rootstocks (50% or higher) and low in own-rooted 'Sambokkul' or in watermelon plants on 'Knight' rootstock. Watermelon hybrids, 'PI 271969 ${\times}$ PI 296341' and 'PI 271769 ${\times}$ Calhoun Gray', showed better or at least comparable growth at low temperatures as compared to 'FR Dantos', confirming the feasibility of using watermelon rootstocks even in low temperature conditions.
Keywords
bottle gourd; grafting; low temperature; Shintozwa;
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