title: Effects of Endogenous Salicylic Acid During Calcium Deficiency-Induced Tipburn in Chinese Cabbage (Brassica rapaL. ssp.pekinensis).
abstract: By cultivating tipburn-susceptible plants in modified Hoagland's medium containing of gradient exogenous calcium (Ca2+), we have shown that Ca2+deficiency is one of the main causes of tipburn in Chinese cabbage (Brassica rapaL. ssp.pekinensis). The effect of endogenous plant Ca2+concentrations on tipburn was also studied in a doubled haploid (DH) population consisting of 100 individuals, but no correlation was found. We then examined the expression of 12 Ca2+transporter genes that function in cytosolic Ca2+homeostasis in both tipburn-susceptible and tipburn-resistant plants under normal and tipburn-inducing conditions. Expression patterns for most of these genes differed between the two types of plants. Salicylic acid (SA) accumulated in response to conditions of calcium deficiency in our study, and both total SA and SA β-glucoside (SAG) in tipburn-susceptible plants was ∼3-fold higher than it was in resistant plants following Ca2+deficiency treatment. Also, the changes observed in SA levels correlated well with cell death patterns revealed by trypan blue staining. Therefore, we speculate that the cytoplasmic Ca2+fluctuation-induced downstream signaling events, as well as SA signaling or other biological events, are involved in the plant defense response to tipburn in Chinese cabbage.
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Tongbing
authors.initials: T
authors.lastname: Su
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Shuancang
authors.initials: S
authors.lastname: Yu
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Ruifang
authors.initials: R
authors.lastname: Yu
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Fenglan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Yangjun
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Deshuang
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Xiuyun
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, 100097 China.|Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, 100097 China.
authors.forename: Weihong
authors.initials: W
authors.lastname: Wang
keywords: Ca2+ transporter; Calcium; Chinese cabbage; Salicylic acid; Tipburn