Heat stress increases the use of cytosolic pyruvate for isoprene biosynthesis
Yáñez Serrano, Ana María (University Freiburg. Institute of Ecosystem Physiology)
Mahlau, Lucas (University Freiburg. Institute of Ecosystem Physiology)
Fasbender, Lukas (University Freiburg. Institute of Ecosystem Physiology)
Byron, Joseph (Max-Planck Institute for Chemistry. Atmospheric Chemistry Department)
Williams, Jonathan (Max-Planck Institute for Chemistry. Atmospheric Chemistry Department)
Kreuzwieser, Jürgen (University Freiburg. Institute of Ecosystem Physiology)
Werner, Christiane (University Freiburg. Institute of Ecosystem Physiology)

Data:	2019
Resum:	The increasing occurrence of heatwaves has intensified temperature stress on terrestrial vegetation. Here, we investigate how two contrasting isoprene-emitting tropical species, Ficus benjamina and Pachira aquatica, cope with heat stress and assess the role of internal plant carbon sources for isoprene biosynthesis in relation to thermotolerance. To our knowledge, this is the first study to report isoprene emissions from P. aquatica. We exposed plants to two levels of heat stress and determined the temperature response curves for isoprene and photosynthesis. To assess the use of internal C sources in isoprene biosynthesis, plants were fed with C position-labelled pyruvate. F. benjamina was more heat tolerant with higher constitutive isoprene emissions and stronger acclimation to higher temperatures than P. aquatica, which showed higher induced isoprene emissions at elevated temperatures. Under heat stress, both isoprene emissions and the proportion of cytosolic pyruvate allocated into isoprene synthesis increased. This represents a mechanism that P. aquatica, and to a lesser extent F. benjamina, has adopted as an immediate response to sudden increase in heat stress. However, in the long run under prolonged heat, the species with constitutive emissions (F. benjamina) was better adapted, indicating that plants that invest more carbon into protective emissions of biogenic volatile organic compounds tend to suffer less from heat stress.
Nota:	Ana Maria Yáñez-Serrano fa constar el CREAF com a adreça de correspondència
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Ficus benjamina ; Heat stress ; Isoprene biosynthesis ; Pachira aquatica ; Photosynthesis ; Pyruvate
Publicat a:	Journal of experimental botany, Vol. 70, Issue 20 (October 2019) , p. 5827-5838, ISSN 1460-2431

DOI: 10.1093/jxb/erz353
PMID: 31396620

12 p, 2.2 MB

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