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Open AccessArticle

Growth, Physiological, Biochemical, and Ionic Responses of Morus alba L. Seedlings to Various Salinity Levels

1
State Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
2
Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China
3
Tibet Municipal Tree Science Institution, Lasa 850000, China
4
Department of Biology and Chemistry, Baoding University, Baoding 071000, China
5
Henan Longyuan Flowers & Trees Co., Ltd., Yanling, Xuchang 461200, China
6
Beijing Forestry University Yanling Collaborative Innovation Center, Yanling, Xuchang 461200, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Forests 2017, 8(12), 488; https://doi.org/10.3390/f8120488
Received: 14 September 2017 / Revised: 17 November 2017 / Accepted: 28 November 2017 / Published: 7 December 2017
(This article belongs to the Section Forest Ecophysiology and Biology)
Mulberry (Morus alba L.), a moderately salt-tolerant tree species, is considered to be economically important. In this study, 1-year-old mulberry seedlings cultivated in soil under greenhouse conditions were treated with five concentrations of sodium chloride (NaCl; 0%, 0.1%, 0.2%, 0.3%, and 0.5%) for 3 and 21 days. Plant growth parameters were not affected by 0.1% NaCl, but significant reductions were observed after treatment with 0.2%, 0.3%, and 0.5% NaCl. The malondialdehyde content and cell membrane stability of mulberry seedlings exposed to 0.1% NaCl did not change, indicating that mulberry is not significantly affected by low-salinity conditions. The Na contents of various organs did not increase significantly in response to 0.1% NaCl, but the K:Na, Mg:Na, and Ca:Na ratios of various organs were affected by NaCl. Marked changes in the levels of major compatible solutes (proline, soluble sugars, and soluble proteins) occurred in both the leaves and roots of NaCl-treated seedlings relative to control seedlings. Under severe saline conditions (0.5% NaCl), the ability of mulberry to synthesize enzymatic antioxidants may be impaired. View Full-Text
Keywords: salinity; mulberry; gas exchange; ion homeostasis; organic osmolytes; enzymatic antioxidants salinity; mulberry; gas exchange; ion homeostasis; organic osmolytes; enzymatic antioxidants
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Lu, N.; Luo, Z.; Ke, Y.; Dai, L.; Duan, H.; Hou, R.; Cui, B.; Dou, S.; Zhang, Y.; Sun, Y.; Li, Y. Growth, Physiological, Biochemical, and Ionic Responses of Morus alba L. Seedlings to Various Salinity Levels. Forests 2017, 8, 488.

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