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

Content Provider	Springer Nature Link
Author	Sáenz Romero, Cuauhtémoc Lamy, Jean Baptiste Loya Rebollar, Esperanza Plaza Aguilar, Andrés Burlett, Régis Lobit, Philippe Delzon, Sylvain
Copyright Year	2013
Abstract	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 México. Open-pollinated seeds were collected from seven natural populations along an altitudinal gradient (3,150–3,650 masl) from Pico de Tancítaro, Michoacán, western México. Seedlings were raised in a nursery and then established in a randomized complete block design in a common garden experiment. Resistance to cavitation (P $_{50}$, xylem pressure inducing 50 % loss of hydraulic conductance and S, slope of the vulnerability curve) and specific hydraulic conductivity (k $_{s}$), were evaluated on branches of 5-year-old seedlings using the Cavitron technique. Mean P $_{50}$ 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 (P $_{50}$ and S), but a significant altitudinal cline was found for S. In contrast, k $_{s}$ 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 México 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.
Starting Page	2905
Ending Page	2913
Page Count	9
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	35
Issue Number	10
e-ISSN	18611664
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-06-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pinus hartwegii Altitudinal genetic variation Climatic change Drought stress Treeline Resistance to cavitation Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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