Genetic variation of drought-induced cavitation resistance among Pinus hartwegii populations from an altitudinal gradient

• Autorzy: Saenz-Romero C. , Lamy J. B. , Loya-Rebollar E. , Plaza-Aquilar A. , Burlett R. , Lobit P. , Delzon S.
• Języki publikacji: EN

Abstrakty

EN

Hydraulic failure can cause massive die-back of forest trees during drought. With extreme climatic events set to become more frequent and severe due to climatic change, it is essential to study resistance to water stress-induced cavitation. We investigated the genetic differentiation for cavitation resistance among Pinus hartwegii populations, the pine species growing at the treeline in Me´xico. Open-pollinated seeds were collected from seven natural populations along an altitudinal gradient (3,150–3,650 masl) from Pico de Tancı´taro, Michoaca´n, western Me´xico. Seedlings were raised in a nursery and then established in a randomized complete block design in a common garden experiment. Resistance to cavitation (P50, xylem pressure inducing 50 % loss of hydraulic conductance and S, slope of the vulnerability curve) and specific hydraulic conductivity (ks), were evaluated on branches of 5-year-old seedlings using the Cavitron technique. Mean P50 was -3.42 ± 0.05 MPa, indicating that Pinus hartwegii is one of the more vulnerable pine species to cavitation. No significant genetic differentiation was detected between populations for cavitation resistance traits (P50 and S), but a significant altitudinal cline was found for S. In contrast, ks exhibited a significant differentiation among populations and a significant decline with increasing altitude. The lack of genetic differentiation among P. hartwegii populations for cavitation resistance is likely to represent a limitation for adapting to the warmer and drier climates that are expected to occur in Me´xico under climatic change. Finally, a worldwide comparison within the Pinus genus showed that pines growing at the treeline were on average more vulnerable to cavitation than those from lowland. This might reflect an adaptation to dry environmental conditions at low elevation.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2013
• Tom: 35
• Numer: 10
• Opis fizyczny: p.2905-2913,fig.,ref.

Twórcy

autor

Saenz-Romero C.

• Universidad Michoacana de San Nicola´s de Hidalgo, Instituto de Investigaciones Agropecuarias y Forestales (UMSNH-IIAF), Km 9.5 Carretera Morelia-Zinape´cuaro, 58880 Tarı´mbaro, Michoaca´n, Mexico

autor

Lamy J. B.

• INRA-Universite´ de Bordeaux, UMR, 1202 BIOGECO, Cestas 33610, France

autor

Loya-Rebollar E.

• Universidad Michoacana de San Nicola´s de Hidalgo, Instituto de Investigaciones Agropecuarias y Forestales (UMSNH-IIAF), Km 9.5 Carretera Morelia-Zinape´cuaro, 58880 Tarı´mbaro, Michoaca´n, Mexico

autor

Plaza-Aquilar A.

• INRA-Universite´ de Bordeaux, UMR, 1202 BIOGECO, Cestas 33610, France
• Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK

autor

Burlett R.

• INRA-Universite´ de Bordeaux, UMR, 1202 BIOGECO, Cestas 33610, France

autor

Lobit P.

• Universidad Michoacana de San Nicola´s de Hidalgo, Instituto de Investigaciones Agropecuarias y Forestales (UMSNH-IIAF), Km 9.5 Carretera Morelia-Zinape´cuaro, 58880 Tarı´mbaro, Michoaca´n, Mexico

autor

Delzon S.

• INRA-Universite´ de Bordeaux, UMR, 1202 BIOGECO, Cestas 33610, France

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