Self-Defense Mechanism in Rice to Salinity: Proline

Yunus Emre Koc, Murat Aycan () and Toshiaki Mitsui
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Yunus Emre Koc: Department of Life and Food Sciences, Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
Murat Aycan: Laboratory of Biochemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
Toshiaki Mitsui: Laboratory of Biochemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan

J, 2024, vol. 7, issue 1, 1-13

Abstract: The increasing global population and climate change threaten food security, with the need for sustenance expected to rise by 85% by 2050. Rice, a crucial staple food for over 50% of the global population, is a major source of calories in underdeveloped and developing countries. However, by the end of the century, over 30% of rice fields will become saline due to soil salinity caused by earthquakes, tsunamis, and rising sea levels. Plants have developed strategies to deal with salt stress, such as ion homeostasis, antioxidant defense mechanisms, and morphological adaptations. Proline, an endogenous osmolyte, is the predominant endogenous osmolyte that accumulates in response to salinity, and its overexpression in rice plants has been observed to increase plant salinity tolerance. Exogenously applied proline has been shown to improve plant salt tolerance by reducing the destructive effect of salinity. Recent research has focused on ionic toxicity, nitrogen fixation, and gene expression related to salt tolerance. Exogenous proline has been shown to improve water potential and leaf content, restoring water usage efficiency. It can also ease growth inhibition in salt-sensitive plants. Exogenously applied proline increases antioxidant activities and enhances plant salinity tolerance. This review examines the role and processes of proline in rice plants under salt stress and its relationship with other tolerance mechanisms.

Keywords: enzymes; NaCl; antioxidant; osmolyte; paddy field; exogenous proline (search for similar items in EconPapers)
JEL-codes: I1 I10 I12 I13 I14 I18 I19 (search for similar items in EconPapers)
Date: 2024
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