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Light Intensity Affects Capsaicinoid Accumulation in Hot Pepper (Capsicum chinense Jacq.) Cultivars
Nakarin Jeeatid,Suchila Techawongstien,Sungcom Techawongstien,Paul W. Bosland,Bhalang Suriharn 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.2
To increase the tolerance of Chinese cabbage (Brassica campestris L. ssp. pekinensis) to Pieris rapae, weintroduced a modified cowpea trypsin inhibitor (CpTI) gene, SCK, into various cultivars. SCK was derived fromCpTI, an insect-resistance gene. The protein accumulating capacity of CpTI can be improved by adding a signalpeptide sequence at the 5' end and an endoplasmic reticulum-detained signal sequence at the 3' end. Using an optimizedAgrobacterium tumefaciens-mediated transformation system in Chinese cabbage, we obtained a maximum transformationefficiency of ~6.83%. Insect resistance tests and CpTI enzymatic assays showed that most of the transgenic plantshad significant resistance to cabbage worm (Pieris rapae) larvae and that the plants with the highest levels of insectresistance had the greatest CpTI-related capacity, indicating a high correlation between SCK expression and insectresistance. An evaluation of segregation patterns in the independent transgenic line with the highest insect resistance,‘ZB-08-04’, showed that kanamycin resistant versus sensitive plants segregated in a 3:1 Mendelian fashion. This studyprovides a potential germplasm resource for Chinese cabbage breeding in the future.