Leaf ontogeny strongly influences photosynthetic tolerance to drought and high temperature in Gossypium hirsutum

Leaf ontogeny strongly influences photosynthetic tolerance to drought and high temperature in Gossypium hirsutum

Copyright © 2016 Elsevier GmbH. All rights reserved.

Bibliographische Detailangaben
Veröffentlicht in:Journal of plant physiology. - 1979. - 199(2016) vom: 20. Juli, Seite 18-28
1. Verfasser: Chastain, Daryl R (VerfasserIn)
Weitere Verfasser: Snider, John L, Choinski, John S, Collins, Guy D, Perry, Calvin D, Whitaker, Jared, Grey, Timothy L, Sorensen, Ronald B, van Iersel, Marc, Byrd, Seth A, Porter, Wesley
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2016
Zugriff auf das übergeordnete Werk:Journal of plant physiology
Schlagworte:Journal Article Drought Gossypium hirsutum Heat tolerance Leaf expansion Photosynthesis Photosystem II Protein Complex Water 059QF0KO0R Chlorophyll 1406-65-1
Beschreibung
Zusammenfassung:Copyright © 2016 Elsevier GmbH. All rights reserved.
Temperature and drought are major abiotic limitations to crop productivity worldwide. While abiotic stress physiology research has focused primarily on fully expanded leaves, no studies have investigated photosynthetic tolerance to concurrent drought and high temperature during leaf ontogeny. To address this, Gossypium hirsutum plants were exposed to five irrigation treatments, and two different leaf stages were sampled on three dates during an abnormally dry summer. Early in the growing season, ontogenic PSII heat tolerance differences were observed. Photosystem II was more thermotolerant in young leaves than mature leaves. Later in the growing season, no decline in young leaf net photosynthesis (PN) was observed as leaf temperature increased from 31 to 37°C, as average midday leaf water potential (ΨMD) declined from -1.25 to -2.03MPa. In contrast, mature leaf PN declined 66% under the same conditions. Stomatal conductance (gs) accounted for 84-98% of variability in leaf temperature, and gs was strongly associated with ΨMD in mature leaves but not in young leaves. We conclude that young leaves are more photosynthetically tolerant to heat and drought than mature leaves. Elucidating the mechanisms causing these ontogenic differences will likely help mitigate the negative impacts of abiotic stress in the future
Beschreibung:Date Completed 12.01.2018
Date Revised 30.09.2020
published: Print-Electronic
Citation Status MEDLINE
ISSN:1618-1328
DOI:10.1016/j.jplph.2016.05.003