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Effects of enhanced UV-B radiation on morphology, physiology, biomass, leaf anatomy and ultrastructure in male and female mulberry (Morus alba) saplings

文献类型： 外文期刊

作者： Chen, Menghua 2 ; Huang, Youyou 1 ; Liu, Gang; Qin, Fang 1 ; Yang, Shuai 1 ; Xu, Xiao 1 ;

作者机构： 1.China West Normal Univ, Minist Educ, Key Lab Southwest China Wildlife Resources Conser, Nanchong 637009, Sichuan, Peoples R China

2.China West Normal Univ, Coll Life Sci, Nanchong 637009, Sichuan, Peoples R China

3.China West Normal Univ, Coll Life Sci, Na

关键词： Anthocyanin concentration;Biomass allocation;Carbon isotope composition;Dioecious;Morus alba

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

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收录情况： SCI

摘要： Effects of UV-B radiation on growth have been reported in many plants, but little attention has been paid to dioecious plants. To further address sexual differences in morphology, physiology, biomass, and leaf anatomy and ultrastructure could be induced by higher UV-B radiation, mulberry (Morus alba L.) saplings were chosen and subjected to ambient UV-B radiation (control) and enhanced UV-B radiation (10% higher than control) for one season's growth. Compared with control, enhanced UV-B radiation damaged lamina epidermis and spongy parenchyma, injured chloroplast ultrastructure, significantly decreased shoot height (SH), basal diameter (BD), total leaf area (LA), specific leaf area, net photosynthetic rate (P-n), total dry mass (TM), relative chlorophyll content (SPAD) and carbon isotope composition (delta C-13), and increased the ratio of aboveground/belowground mass (AB) and UV-B absorbing compounds in both male and female saplings. Moreover, under enhanced UV-B radiation, males received less injuries in leaf structure and chloroplasts, and had significant higher SH, BD, LA, TM, P-n, SPAD, delta C-13, anthocyanin concentration but lower UV-B absorbing compounds and AB than female saplings. However, no significant sexual differences in these traits were observed under ambient UV-B radiation. Our results demonstrated that female plants would suffer more negative effects on morphology, physiology, biomass allocation and leaf structure than do males under enhanced UV-B radiation due to more resource requirement for reproductive development. (C) 2016 Elsevier B.V. All rights reserved.

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[1]Sexual differences in morphology and aboveground biomass allocation in relation to branch number in Morus alba saplings. Wang, Bixia,Xu, Xiao,He, Xinhua,Liu, Gang,Xu, Xiao.

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