Elevated CO2 and Water Stress in Combination in Plants: Brothers in Arms or Partners in Crime?

Arun Shanker; Deepika Gunnapaneni; Divya Bhanu; M Vanaja; N Jyothilakshmi; S.K Yadav; M Prabhakar; V.K Singh

doi:10.20944/preprints202008.0286.v2

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preprints.org > biology and life sciences > agricultural science and agronomy > doi: 10.20944/preprints202008.0286.v2

Preprint Review Version 2 Preserved in Portico This version is not peer-reviewed

Elevated CO₂ and Water Stress in Combination in Plants: Brothers in Arms or Partners in Crime?

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Version 1 : Received: 11 August 2020 / Approved: 12 August 2020 / Online: 12 August 2020 (13:27:02 CEST)
Version 2 : Received: 1 July 2022 / Approved: 4 July 2022 / Online: 4 July 2022 (08:21:01 CEST)

A peer-reviewed article of this Preprint also exists.

Shanker, A.K.; Gunnapaneni, D.; Bhanu, D.; Vanaja, M.; Lakshmi, N.J.; Yadav, S.K.; Prabhakar, M.; Singh, V.K. Elevated CO2 and Water Stress in Combination in Plants: Brothers in Arms or Partners in Crime? Biology 2022, 11, 1330. https://doi.org/10.3390/biology11091330 Shanker, A.K.; Gunnapaneni, D.; Bhanu, D.; Vanaja, M.; Lakshmi, N.J.; Yadav, S.K.; Prabhakar, M.; Singh, V.K. Elevated CO2 and Water Stress in Combination in Plants: Brothers in Arms or Partners in Crime? Biology 2022, 11, 1330. https://doi.org/10.3390/biology11091330

Abstract

The changing dynamics in climate is the primary and important determinant of agriculture productivity. The effects of this changing climate on overall productivity in agriculture can be understood when we study the effects of individual components contributing to the changing climate on plants and crops. Elevated CO₂ (eCO₂) and drought due to high variability in rainfall is one of the important manifestations of the changing climate. There is a considerable amount of literature that addresses climate effects on plant systems from molecules to ecosystems. Of particular interest is the effect of increased CO₂ on plants in relation to drought and water stress. As it is known that one of the consistent effects of increased CO₂ in the atmosphere is increased photosynthesis, especially in C₃ plants, it will be interesting to know the effect of drought in relation to elevated CO₂. The potential of elevated CO₂ ameliorating the effects of water deficit stress is evident from literature suggesting that these two are agents are brothers in arms protecting the plant from stress rather than partnering in crime, specifically water deficit when in isolation. The possible mechanisms by which this occurs will be discussed in this minireview. Interpreting the effects of short-term and long-term exposure of plants to elevated CO₂ in the context of ameliorating the negative impacts of drought will show us the possible ways by which there can be effective adaption to crops in the changing climate scenario.

Keywords

elevated CO2; drought; photosynthesis; transpiration rate; stomatal conductance; C4 enzymes; malate; water deficit stress; abscisic acid

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comments (1)

Comment 1

Received: 4 July 2022
Commenter: Arun Shanker
Commenter's Conflict of Interests: Author

Comment: The review has been improved much by adding different sub headings and adding new references and more critical analysis of the literature. Three additional figures have been added, one showing the molecular basis of elevated CO2 and drought mediated stomatal closure, another figure showing a schematic representation of individual and interactive effects of water deficit stress and eCO2 in C3 and C4 plants. Another figure was developed by homolgy modelling of the C4 enzymes showing Homology models of NADP-ME and NAD-ME enzymes with their beta-hairpin bends. A table was also added showing structureal differences of the C4 enzymes.

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