Effects of Exogenous Ethylene on Physiology and Alkaloid Accumulations in Catharanthus roseus

doi:10.7525/j.issn.1673-5102.2018.02.017

Abstract

Abstract: Catharanthus roseus, as a medicinal plant, contains more than 100 terpenoid indole alkaloids(TIAs), including vinblastine and vincristine which focus on anti-cancer effects. In order to study the comprehensive influence of exogenous ethylene on growth, physiology, and terpenoid indole alkaloid accumulations, C.roseus seedlings were cultured as experimental material and contrasted the data of biomass, growth rate of root and stem, photosynthetic parameter and alkaloid contents with or without ethephon treatment, and the correlations between these indexes were analyzed. The ethylene release amount and the expression of erf(ethylene-response factor) gene were increased under exogenous ethylene treatment. Ethephon inhibited biomass, longitudinal growth but promoted lateral thickening growth of stem; in addition, net photosynthetic rate(P_n) and stomatal conductance(G_s) were decreased leading from non-stomatal factor. The biosynthesis of four alkaloids including strictosidine(STR), catharanthine(CAT), vindoline(VIN) and vinblastine(VINB) were accelerated in ethephon-treatment group, and the expression of key enzyme genes(str and CrPRX) were up-regulated by ethephon. By correlation analysis, we found that relationships among alkaloid contents, growth indexes and photosynthetic parameters were significant and photosynthetic parameters were significant. It were positive relation between three alkaloids including CAT, VIN, VINB and stem diameter(SD)(P < 0.05). On the contrary, there was a significantly negative relations between these three alkaloids and biomass(B), height(H), root length(RL), net photosynthetic rate(P_n)(P < 0.05). Our study will provide useful information for mechanism research of exogenous ethylene regulating TIAs biosynthesis in C.roseus.

Key words: ethephon, Catharanthus roseus, physiological level, alkaloid accumulation, correlation analysis

CLC Number:

Q949.776.5

CHANG Bo-Wen, LIU Jie, ZHONG Peng, GUO Xiao-Rui. Effects of Exogenous Ethylene on Physiology and Alkaloid Accumulations in Catharanthus roseus[J]. Bulletin of Botanical Research, 2018, 38(2): 284-291.

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