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Grant support

This research was funded by Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria (INIA) grant number RTA2015-00054-C02-01. Research of D.S.K. is supported by a DOC INIA-CCAA contract co-funded by INIA and European Social Fund (ESF).

Análisis de autorías institucional
Gil Pelegrín, Eustaquio - Autor o Coautor
Sancho Knapik, Domingo - Autor o Coautor
Peguero Pina, Jose Javier - Autor o Coautor
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Publicaciones > Artículo

Cavitation Limits the Recovery of Gas Exchange after Severe Drought Stress in Holm Oak (Quercus ilex L.)

Publicado en:Forests. 9 (8): - 2018-07-24 9(8), doi: 10.3390/f9080443

Gil Pelegrín, Eustaquio; Sancho Knapik, Domingo; Peguero Pina, Jose Javier;

Afiliaciones

Centro de Investigación y Tecnología Agroalimentaria de Aragón - Entidad de origen
DOC INIA-CCAA - INIA - Financiador
European Social Fund (ESF)European Social Fund (ESF) - Financiador
Gobierno Aragon, Ctr Invest & Tecnol Agroalimentaria Aragon, Unidad Recursos Forestales, Avda Montanana 930, Zaragoza 50059, Spain - Autor o Coautor
Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria (INIA)Instituto de Investigacion Agropecuaria (INIA) [RTA2015-00054-C02-01] - Financiador
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Resúmen

Resúmen: Holm oak (Quercus ilex L.) is a Mediterranean species that can withstand intense summer drought through a high resistance to cavitation far beyond the stomatal closure. Besides stomatal limitations, both mesophyll and biochemical limitations to CO2 uptake could increase in holm oak under drought. However, no studies have addressed how hydraulic and non-hydraulic factors may limit the recovery of photosynthesis when re-watering after inducing 50% loss of hydraulic conductivity. We measured photosynthetic traits, xylem embolism, and abscisic acid (ABA) in holm oak with increasing levels of drought stress and seven days after plant re-watering. Drought stress caused a sharp decrease in net CO2 assimilation (A(N)), stomatal and mesophyll conductance (g(s) and g(m)), and maximum velocity of carboxylation (V-cmax). The stomatal closure could be mediated by the rapid increase found in ABA. The high level of xylem embolism explained the strong down-regulation of g(s) even after re-watering. Therefore, only a partial recovery of A(N) was observed, in spite of non-hydraulic factors not limiting the recovery of A(N), because i/ABA strongly decreased after re-watering, and ii/g(m) and V-cmax recovered their original values. Therefore, the hydraulic-stomatal limitation model would be involved in the partial recovery of A(N), in order to prevent extensive xylem embolism under subsequent drought events that could compromise holm oak survival.

Palabras clave: Abscisic acid; Co2; Drought; Embolism; Holm oak; Hydraulic conductivity; Leaf; Limitations; Maximum velocity of carboxylation; Mechanisms; Mesophyll conductance; Mesophyll diffusion conductance; Photosynthesis; Photosynthetic performance; Pinus-sylvestris l.; Recovery; Stomatal conductance; Stomatal sensitivity; Xylem embolism

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