Silicon-mediated improvement of biomass yield and physio-biochemical attributes in heat-stressed spinach (Spinacia oleracea)
Quratulain Khosa A , Qamar uz Zaman
A * , Tingting An B , Kamran Ashraf C , Asim Abbasi D , Saba Nazir A , Riffat Naz A and Yinglong Chen E *
+ Author Affiliations
- Author Affiliations
A Department of Environmental Sciences, The University of Lahore, Lahore 54590, Pakistan.
B Institute of Soil and Water Conservation, Chinese Academy of Sciences, and Northwest A&F University, Yangling 712100, China.
C Department of Food Sciences, Government College University Faisalabad, Sahiwal Campus, Sahiwal 57000, Pakistan.
D Department of Environmental Sciences, Kohsar University, Murree, Pakistan.
E The UWA Institute of Agriculture, and School of Agriculture and Environment, The University of Western Australia, Perth, WA 6009, Australia.
* Correspondence to: yinglong.chen@uwa.edu.au, qamar.zaman1@envs.uol.edu.pk
Handling Editor: Enrico Francia
Crop & Pasture Science 74(3) 230-243 https://doi.org/10.1071/CP22192
Submitted: 3 June 2022 Accepted: 1 August 2022 Published: 6 September 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: Defensive action of plants against biotic and abiotic stresses has been augmented by silicon (Si). Spinach (Spinacia oleracea L.) is a nutritious leafy vegetable that is a cold-tolerant but heat-sensitive crop.
Aims and methods: The ability of exogenous application of Si (0, 2, 4 and 6 mmol L−1 in the form of K2SiO3) to alleviate heat stress in spinach cv. Desi Palak was investigated. After an acclimatisation period, plants were grown with or without heat stress for 15 days, followed by Si treatment for 25 days. Plant growth and physiology were assessed at 65 days after sowing.
Key results: Heat stress significantly inhibited plant growth, water status and photosynthesis, soluble sugar and protein contents, and osmolyte status in spinach leaves, but increased electrolyte leakage, activities of antioxidant enzymes, and proline content. Application of Si alleviated heat stress by enhancing water status, photosynthetic pigments, soluble proteins and essential minerals, and by reducing damage of the plasma membrane. The accumulation of osmolytes counterbalance the osmotic stress imposed by heat.
Conclusions: Silicon plays a vital role in alleviating effects of heat stress by improving water status and photosynthetic rate, and accruing osmoprotectants other than proline.
Implications: Exogenous application of Si is an efficient strategy to boost tolerance of spinach plants to heat stress, having significant impact on growth and productivity of spinach at higher temperatures.
Keywords: antioxidants, heat stress, photosynthetic pigments, physio-biochemical, plasma membrane, silicon, spinach, water relations.
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