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Yoonah Jang,Youngyeol Cho,Hancheol Rhee,Yeongcheol Um 한국원예학회 2008 Horticulture, Environment, and Biotechnology Vol.49 No.2
The objective of this study was to investigate the effects of rootstock and night temperature on the growth and yield of grafted pepper (Capsicum annuum L.) in greenhouse. Four commercial pepper varieties, six commercial rootstocks, four breeding lines, and one eggplant rootstock were grown at three levels of night temperature (NT) (10, 15, and 20℃). At 10℃NT, the total dry weight was the greatest in 'Kataguruma' followed by 'Koregon PR-380' and 'PR-Power'. The dry weight of root at 10℃ NT was also the greatest in 'Kataguruma' followed by 'PR-Power'. RGRs of genotypes varied among the10, 15, and 20℃ NTs. They could be categorized into three types according to the response to NT. The RGRs of genotypes that belonged to type Ⅰ were reduced approximately 0.01 to 0.03 g·g<SUP>-1</SUP>·day<SUP>-1</SUP> as NT decreased. In type Ⅱ, they were similar between 15 and 20℃NT but rapidly decreased under 10℃NT, whereas they were stable irrespective of NT in type Ⅲ. 'Kataguruma' and 'Koregon PR-380' in type Ⅲ showed higher RGRs than other genotypes except 'Taibyo VF'. Cultivar 'Nokkwang' as scions was grafted onto rootstocks 'Kataguruma', 'Koregon PR-380', 'PR-power', and 'Tantan' selected from 14 genotypes. All growth parameters were greater in non-grafted seedlings. Among the grafted seedlings, the growth of peppers grafted onto 'Kataguruma' was better. The leaf area and dry weight of leaves were the smallest in the pepper seedlings grafted onto 'Koregon PR-380'. When these grafted peppers were cultivated at different NT conditions (8, 13, and 20℃) in greenhouse, low NT decreased the growth and yield of peppers. The growth and yield of grafted peppers were greater than those of non-grafted peppers irrespective of temperature. However, rootstocks with tolerance to low temperature didn't significantly improve the growth and productivity under low temperature condition, though the grafting did. Finally, we couldn't screen out any strong rootstock at low temperature condition for the better growth and productivity of pepper.