Kaolin modulates ABA and IAA dynamics and physiology of grapevine under Mediterranean summer stress

Kaolin modulates ABA and IAA dynamics and physiology of grapevine under Mediterranean summer stress

•Kaolin improves the physiological machinery of grapevines.•The ABA and IAA dynamics are changed by Kaolin.•Summer stress is mitigated by Kaolin application. The foliar exogenous application of kaolin, a radiation-reflecting inert mineral, has proven to be an effective short-term climate change miti...

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Bibliographic Details
Published in:Journal of plant physiology Vol. 220; pp. 181 - 192
Main Authors: Dinis, L.-T., Bernardo, S., Luzio, A., Pinto, G., Meijón, M., Pintó-Marijuan, M., Cotado, A., Correia, C., Moutinho-Pereira, J.
Format: Journal Article
Language:English
Published: Germany Elsevier GmbH 01-01-2018
Elsevier Science Ltd
Subjects:
Abscisic acid
Acetic acid
Carbon dioxide
Chlorophyll
Climate change
Climate change mitigation
Conductance
Electron transport
Fluorescence
Gas exchange
Grapevines
Indoleacetic acid
Kaolin
Leaves
Minerals
Parameters
Particle film
Photochemicals
Photosynthesis
Photosystem II
Physiological performance
Physiological responses
Physiology
Phytohormones dynamics
Plant tolerance
Quantum efficiency
Radiation
Resistance
Spraying
Stomata
Stomatal conductance
Summer
Vineyards
Water potential
Water stress
Water use
Water use efficiency
Wineries & vineyards
Portugal
ABA
A
ETR
A/gs
E
ΦPSII
Ci/Ca
IAA
Ψ0
gs
Particle film
Water stress
PIABS
Phytohormones dynamics
Ψpd
Climate change
Ψmd
Fv/Fm
Physiological performance
qN
qP
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Summary:•Kaolin improves the physiological machinery of grapevines.•The ABA and IAA dynamics are changed by Kaolin.•Summer stress is mitigated by Kaolin application. The foliar exogenous application of kaolin, a radiation-reflecting inert mineral, has proven to be an effective short-term climate change mitigation strategy for Mediterranean vineyards. In this work, we address the hypothesis that kaolin could improve both the hormonal dynamics and physiological responses of grapevines growing in Douro Region, northern Portugal. For this purpose, the leaf water potential, gas exchange and chlorophyll a fluorescence parameters were monitored, as well as the abscisic acid (ABA) and indole-3-acetic acid (IAA) quantification and immunolocalization were assessed. The study revealed a slight decrease in ABA and an increase in IAA in the kaolin treatment, which in turn were associated with the improvement of physiological performance. A month after spraying, kaolin improves the water potential respectively, 30% and 17% in the predawn and midday periods. Besides, plants treated with kaolin showed higher values of stomatal conductance, net CO2 assimilation rate and intrinsic water use efficiency. Kaolin also ameliorates the effective PSII efficiency (67%), as well as the maximum quantum efficiency of photosystem II and the photosynthetic electron transport rate (>73%). These results were consistent with the higher photochemical quenching and the lower non-photochemical quenching observed in treated leaves and with the better performance obtained by the JIP test parameters. Physiological and hormonal analysis confirmed that kaolin effectively enhance grapevine summer stress tolerance.
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ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2017.11.007