Pedosphere 32(6): 893--904, 2022
ISSN 1002-0160/CN 32-1315/P
©2022 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Nutrient uptake, physiological responses and growth of tobacco (Nicotiana tabacum L.) in soil under composite salt stress
Jian CUI1, Dongrui YAO1, Jing MA2,3, Xiefeng YE2, Ying PENG4, Jiaqian SONG2, Jinfeng LI1, Yajun CHANG1, John YANG5, Zhen ZHANG2, Xueli LI6, Xiaojing LIU1, Khalil KARIMAN7
1Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014(China)
2National Tobacco Cultivation and Physiology and Biochemistry Research Center, Key Laboratory for Tobacco Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002(China)
3Shangluo Tobacco Company, Luonan Branch, Shangluo 726000(China)
4School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171(China)
5Department of Agriculture and Environmental Science, Lincoln University of Missouri, Jefferson City MO 65201(USA)
6Staff Development Institute of China National Tobacco Corporation, Zhengzhou 450000(China)
7School of Agriculture and Environment, The University of Western Australia, Perth WA 6009(Australia)
      High soil salinity imposes osmotic stress and ion toxicity in plants, leading to substantial crop yield loss worldwide. Understanding of the quantitative and dynamic physiological responses to composite soil salt stress is limited and needs to be expanded. In this study, physiological, nutritional, and biomass yield parameters of tobacco (Nicotiana tabacum L.) grown in soil with five levels of composite soil salinity (CSS), basal CSS level (control, CK) and 3 (T1), 6 (T2), 9 (T3), and 12 (T4) times the basal CSS level, under greenhouse were determined at days 30, 60, and 90 after transplanting. Leaf dry biomass significantly (P < 0.05) increased at the low salinity levels applied (T1 and T2) at all three time points, whereas it progressively declined as the CSS level further increased. The leaf physiological and photosynthetic responses were more adversely affected by CSS at the early growth stage (day 30). A path coefficient analysis demonstrated that leaf proline content had the largest direct effect (-0.66), and leaf Cu content had the most significant indirect effect (0.49) on leaf dry biomass of plants. The results suggest that lower CSS levels (T1 and T2) could stimulate tobacco growth (leaf biomass yield, in particular), and higher leaf proline and Cu levels at the early growth stage may potentially increase the ability of tobacco plants to withstand the adverse effects of salinity, which could be considered for future research and development of salinity management strategies.
Key Words:  anti-adversity metabolite,composite soil salinity,hormone,malondialdehyde,proline,translocation factor
Citation: Cui J,Yao D R, Ma J, Ye X F, Peng Y, Song J Q, Li J F, Chang Y J, Yang J, Zhang Z, Li X L, Liu X J, Kariman K. 2022. Nutrient uptake, physiological responses and growth of tobacco (Nicotiana tabacum L.) in soil under composite salt stress. Pedosphere. 32(6): 893-904.
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