ScholarWorks@경상국립대학교

초록

This study was conducted to investigate the growth characteristics of different cultivars of grafted cucumber (Cucumis sativus L.) seedlings when affected by different temperature conditions and to identify the optimal day and night temperatures after the grafting stage. Three cucumber cultivars were used, 'NakWonSeongcheongjang, NS', 'Sinsedae, SD', and 'Goodmorning backdadagi, GB', with seedlings as scions grafted onto a figleaf gourd (Cucurbita ficifolia 'Heukjong') seedling as the rootstock. Experiment 1 investigated the appropriate air temperature by assessing growth characteristics as affected by different temperatures, in this case 18, 23, and 28 degrees C (24 h). Experiment 2 investigated growth characteristics as affected by the night temperature. Based on the results of experiment 1, the day temperature was fixed at 28 degrees C, which was best for growth, and the night temperatures then assessed were 15, 20, and 25 degrees C (12/12 h). Root and shoot growth levels of all cultivars were promoted when the air temperature was 28 degrees C, and the seedling period could be effectively shortened. On the other hand, the optimal night temperature differed significantly depending on the cultivar. 'NS' and 'SD' showed inhibited respiration when the night temperature was 15 degrees C, with significantly decreased plant heights and leaf areas and increased shoot dry weights. Also, the seedling quality was high at 15 degrees C. On the other hand, the growth of 'GB' was significantly promoted at 25 degrees C and the seedling quality was also high. Therefore, it is considered that the optimal day/night temperatures of cucumber seedlings after the grafting stage are 28/15 degrees C for 'NS' and 'SD' and 28/25 degrees C for 'GB'.

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