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Determination of Salt Type, Salt Concentration, and Salt Application Method and Timing for Suppression of Stem Elongation in Grafted Cucumber Seedlings  

Moon, Ji-Hye (National Institute of Horticultural and Herbal Science, RDA)
Jang, Yoon-Ah (National Institute of Horticultural and Herbal Science, RDA)
Yun, Hyung-Kweon (National Institute of Horticultural and Herbal Science, RDA)
Lee, Sang-Gyu (National Institute of Horticultural and Herbal Science, RDA)
Lee, Ji-Weon (National Institute of Horticultural and Herbal Science, RDA)
Publication Information
Journal of Bio-Environment Control / v.19, no.4, 2010 , pp. 317-323 More about this Journal
Abstract
This study aimed to examine a suppression effect of salinity on extension rate of stem elongation of cucumber seedlings (Cucumis sativus L.) grafted with roots of figleaf gourd plant. The effects of application methods, timings, and concentrations of two salt types, sodium chloride (NaCl) and calcium chloride ($CaCl_2$), were compared to untreated control plants. In result, an obvious suppression effect on the excessive elongation of stem was obtained by both sub-irrigated and medium-mixed NaCl salt. An improvement in quality of transplants was also obtained by the sub-irrigated NaCl salt. Foliar-applied NaCl caused visible leaf injury when the concentration was higher than 40 mM; but, with no effect on suppressing the stem elongation. When the NaCl was applied at 7 days after grafting, a higher concentration of NaCl was demanded for suppressing the stem elongation compared to an application at the day of grafting. No effect of the NaCl salt on the fresh weights of 36-day grown plants was observed; but, there was a negative effect on the number of female flowers at a high temperature season. Overall, the NaCl salt was more effective on slowing down the stem elongation and had the lower incidence of leaf injury than the $CaCl_2$ salt.
Keywords
$CaCl_2$; diniconazole; NaCl;
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