Effects of shading on photosystem Ⅱ activity and antioxidant system of Rosa hybrida leaves in summer

doi:10.3969/j.issn.1004-1524.2016.09.11

›› 2016, Vol. 28 ›› Issue (9): 1530-1537.DOI: 10.3969/j.issn.1004-1524.2016.09.11

• Horticultural • Previous Articles Next Articles

Effects of shading on photosystem Ⅱ activity and antioxidant system of Rosa hybrida leaves in summer

HOU Wei, MA Xu-hui, ZHANG Hao-yue, Chen Qi-yang, ZHANG Yong^*

College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China

Received:2015-12-30 Online:2016-09-15 Published:2016-11-23

Abstract

Abstract: Potted 3 years old seedlings of Rosa hybrida were grown in 26%, 72% and 100% natural light intensity, and the effects of light intensity on photosystem Ⅱ activity and antioxidant system of R. hybrida were studied. It had been found that with the decreasing light intensity, the gas exchange parameters such as net photosynthesis rate (Pn), stomatal conduction (Gs), transpiration rate (Tr) and intercellular CO₂ concentration (Ci) all decreased, while the stomatal limitation value (Ls) increased. The maximum efficiency of PSⅡ photochemistry (Fv/Fm) was demonstrated single peak, while fluorescent non-photochemical quenching (NPQ) increased. Carotenoids (Cars) content, ratio of carotenoid to total chlorophyll (Car/Chl) and activities of antioxidant enzymes such as SOD, CAT and APX increased with increasing light intensitiy, while the chlorophyll (Chl) content and light use efficiency (LUE) decreased. There was no photoinhibition in 72% natural light intensity of R. hybrida. While in 100% natural light intensity, its photoinhibition was mainly caused by reversible deactivation of PSⅡ reaction center. In 26% natural light intensity, the reaction center of PSⅡ was seriously destroyed, and this had an photoinhibition, the growth of R. hybrida was also inhibited.

Key words: Rosa hybrida, photosynthetic characteristics, antioxidant enzyme, photoinhibition

CLC Number:

S685.12

HOU Wei, MA Xu-hui, ZHANG Hao-yue, Chen Qi-yang, ZHANG Yong. Effects of shading on photosystem Ⅱ activity and antioxidant system of Rosa hybrida leaves in summer[J]. , 2016, 28(9): 1530-1537.

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Effects of shading on photosystem Ⅱ activity and antioxidant system of Rosa hybrida leaves in summer

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