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Lethal heat stress-dependent volatile emissions from tobacco leaves: what happens beyond the thermal edge?

Abstract：

:Natural vegetation is predicted to suffer from extreme heat events as a result of global warming. In this study, we focused on the immediate response to heat stress. Photosynthesis and volatile emissions were measured in the leaves of tobacco (Nicotiana tabacum cv. Wisconsin 38) after exposure to heat shock treatments between 46 °C and 55 °C. Exposure to 46 °C decreased photosynthetic carbon assimilation rates (A) by >3-fold. Complete inhibition of A was observed at 49 °C, together with a simultaneous decrease in the maximum quantum efficiency of PSII, measured as the Fv/Fm ratio. A large increase in volatile emissions was observed at 52 °C. Heat stress resulted in only minor effects on the emission of monoterpenes, but volatiles associated with membrane damage such as propanal and (E)-2-hexenal+(Z)-3-hexenol were greatly increased. Heat induced changes in the levels of methanol and 2-ethylfuran that are indicative of modification of cell walls. In addition, the oxidation of metabolites in the volatile profiles was strongly enhanced, suggesting the acceleration of oxidative processes at high temperatures that are beyond the thermal tolerance limit.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Turan S,Kask K,Kanagendran A,Li S,Anni R,Talts E,Rasulov B,Kännaste A,Niinemets Ü

doi

10.1093/jxb/erz255

subject

Has Abstract

pub_date

2019-09-24 00:00:00

pages

5017-5030

issue

18

eissn

0022-0957

issn

1460-2431

pii

5530373

journal_volume

70

pub_type

杂志文章

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