A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction

Abstract Permanent wilting point (PWP) is generally used to ascertain plant resistance against abiotic drought stress and designated as the soil water content (θ) corresponding to soil suction (ψ) at 1500 kPa obtained from the soil water retention curve. Determination of PWP based on only pre-assume...

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Autores principales:	Ankit Garg, Sanandam Bordoloi, Suriya Prakash Ganesan, Sreedeep Sekharan, Lingaraj Sahoo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e5c4490724144f559eb6cfe408aece90
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spelling	oai:doaj.org-article:e5c4490724144f559eb6cfe408aece902021-12-02T13:34:11ZA relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction10.1038/s41598-020-78893-z2045-2322https://doaj.org/article/e5c4490724144f559eb6cfe408aece902020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78893-zhttps://doaj.org/toc/2045-2322Abstract Permanent wilting point (PWP) is generally used to ascertain plant resistance against abiotic drought stress and designated as the soil water content (θ) corresponding to soil suction (ψ) at 1500 kPa obtained from the soil water retention curve. Determination of PWP based on only pre-assumed ψ may not represent true wilting condition for soils with contrasting water retention abilities. In addition to ψ, there is a need to explore significance of additional plant parameters (i.e., stomatal conductance and photosynthetic status) in determining PWP. This study introduces a new framework for determining PWP by integrating plant leaf response and ψ during drought. Axonopus compressus were grown in two distinct textured soils (clayey loam and silty sand), after which drought was initiated till wilting. Thereafter, ψ and θ within the root zone were measured along with corresponding leaf stomatal conductance and photosynthetic status. It was found that coarse textured silty sand causes wilting at much lower ψ (≈ 300 kPa) than clayey loam (≈ 1600 kPa). Plant response to drought was dependent on the relative porosity and mineralogy of the soil, which governs the ease at which roots can grow, assimilate soil O2, and uptake water. For clay loam, the held water within the soil matrix does not facilitate easy root water uptake by relatively coarse root morphology. Contrastingly, fine root hair formation in silty sand facilitated higher plant water uptake and doubled the plant survival time.Ankit GargSanandam BordoloiSuriya Prakash GanesanSreedeep SekharanLingaraj SahooNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-15 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ankit Garg Sanandam Bordoloi Suriya Prakash Ganesan Sreedeep Sekharan Lingaraj Sahoo A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
description	Abstract Permanent wilting point (PWP) is generally used to ascertain plant resistance against abiotic drought stress and designated as the soil water content (θ) corresponding to soil suction (ψ) at 1500 kPa obtained from the soil water retention curve. Determination of PWP based on only pre-assumed ψ may not represent true wilting condition for soils with contrasting water retention abilities. In addition to ψ, there is a need to explore significance of additional plant parameters (i.e., stomatal conductance and photosynthetic status) in determining PWP. This study introduces a new framework for determining PWP by integrating plant leaf response and ψ during drought. Axonopus compressus were grown in two distinct textured soils (clayey loam and silty sand), after which drought was initiated till wilting. Thereafter, ψ and θ within the root zone were measured along with corresponding leaf stomatal conductance and photosynthetic status. It was found that coarse textured silty sand causes wilting at much lower ψ (≈ 300 kPa) than clayey loam (≈ 1600 kPa). Plant response to drought was dependent on the relative porosity and mineralogy of the soil, which governs the ease at which roots can grow, assimilate soil O2, and uptake water. For clay loam, the held water within the soil matrix does not facilitate easy root water uptake by relatively coarse root morphology. Contrastingly, fine root hair formation in silty sand facilitated higher plant water uptake and doubled the plant survival time.
format	article
author	Ankit Garg Sanandam Bordoloi Suriya Prakash Ganesan Sreedeep Sekharan Lingaraj Sahoo
author_facet	Ankit Garg Sanandam Bordoloi Suriya Prakash Ganesan Sreedeep Sekharan Lingaraj Sahoo
author_sort	Ankit Garg
title	A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
title_short	A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
title_full	A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
title_fullStr	A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
title_full_unstemmed	A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
title_sort	relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/e5c4490724144f559eb6cfe408aece90
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A relook into plant wilting: observational evidence based on unsaturated soil–plant-photosynthesis interaction

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