Abstract
The jujube cultivar ‘Qiyuexian’ was chosen as object in this study. Effects of different concentrations of brassinolide (BL) on its characteristic parameters of light/CO 2 response curve were investigated. The results indicated that the mentioned parameters were significantly affected by the concentrations of BL. The Light Saturation Point ( LSP ) was significantly increased by 17.42% after being treated by 0.1 mg/L BL. After spraying 0.2 mg/L BL, the maximum net photosynthetic rate ( Pnmax ), apparent quantum efficiency ( AQY ), LSP, maximum carboxylation rate ( V cmax ), maximum rate of photosynthetic electron transport ( J max ) and Triose Phosphate Utilization rate ( TPU ) were significantly increased by 21.14, 20.26, 21.95, 21.14, 20.26 and 21.95%, respectively. The AQY , LCP , LSP , V cmax and J max were significantly increased by 12.55, 60.75, 19.00, 20.96 and 20.06% respectively after being treated by 0.3 mg/L BL, while the LCP and LSP were significantly increased by 65.53% and 25.79% respectively after being treated by 0.4 mg/L BL. In conclusion, 0.2 mg/L BL treatment could significantly accelerate the overall photosynthetic ability of “Qiyuexian” jujube, promoting its accumulation of assimilative products, which is beneficial to increase the production and quality of jujube fruits.
Highlights
Jujube (Zizyphus jujube) is a native economic tree species in China
The Light Saturation Point (LSP) of jujube was significantly increased by 17.42% (p
The Vcmax, Jmax and Triose Phosphate Utilization rate (TPU) of jujube tree were significantly increased by 21.14, 20.26 and 21.95% respectively under 0.2 mg/L BL treatment, while the Vcmax and Jmax were significantly increased by 20.96% and 20.06% respectively under 0.3 mg/L BL treatment
Summary
Jujube (Zizyphus jujube) is a native economic tree species in China. Jujube tree has favorable tolerance to environmental stresses and poor soil, while its fruit contains abundant sugar, amino acid, vitamin C and phenolic compounds (Guo et al, 2015; Wang et al, 2016), exhibiting important economic and ecological benefits. After long-term cultivation, jujube had become one of important fruit species and it has the 3rd largest cultivated area and the 7th largest yield among the fruit productions in China. For its mentioned benefits and the ability to increase fruitsetting percentage (Ali et al, 2006), BRs might be used to increase the photosynthetic efficiency and to increase the yield and quality of jujube. Most of existed studies focus on the application of BRs on the Corresponding Author: Gang Han, College of Forestry, Northwest A&F University, Yangling Shaanxi 712100, China, Tel.: +86 13772195939
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