Pinus devoniana LIKELY AVOIDS DROUGHT STRESS BY DELAYING SHOOT ELONGATION
Por:
Castellanos-Acuna, Dante, Alberto Mota-Narvaez, Luis, Lopez-Mondragon, Tanya, Lindig-Cisneros, Roberto A., Saenz-Romero, Cuauhtemoc
Publicada:
1 ene 2022
Resumen:
Understanding the growth rate and the timing of conifer seedling bud
elongation can be useful in selecting tree species for commercial
plantations and ecological restoration, either under the current climate
or to adapt to climatic change. Shoot growth dynamics of three dominant
Pinus species of the pine-oak forest of the Nuevo San Juan
Parangaricutiro indigenous community in Western Mexico were inspected.
Using a common garden trial of three species and seven provenances,
growth was related to contemporary (1961-1990 period averages) and
future (rcp6.0 ensemble and decade centered on year 2060) climate.
Significant differences between species were found in two-year-old
plants, P. pseudostrobus and P. leiophylla showed greater shoot
elongation and plant height, larger elongation period and plant height,
and later growth cessation than P. devoniana, P. pseudostrobus and P.
leiophylla, which begin their growth and elongate their shoots during
the warm, dry season (March to May). Pinus devoniana delays the start of
growth until the end of the dry season (end of May). This suggests that
P. devoniana, at least for the second year of growth, probably avoids
drought stress by delaying shoot elongation, which could partly explain
why this species grows at lower altitude than the other pines. Climate
change projections for Mexico indicate an increase in aridity conditions
by the year 2060, particularly for the lower altitudinal limit of the
populations of P. pseudostrobus and P. leiophylla. Reforestation with P.
devoniana might be required at the lower altitud limits of these pines
if forest decline continues.
Filiaciones:
Univ Alberta, Fac Agr Life & Environm Sci, Dept Renewable Resources, Edmonton, AB, Canada
Univ Michoacana, Inst Invest Recursos Nat, Morelia, Michoacan, Mexico
Inst Tecnol Conkal, Conkal, Yucatan, Mexico
Ctr Invest Cient Yucatan AC, Merida, Yucatan, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, Lab Ecol Restaurac, Morelia, Michoacan, Mexico
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