Repositorio
Institucional

Cavieres González, Lohengrin Alexis

Hernandez-Fuentes, C.

Galmes, J.

Bravo, L. A.

Cavieres, L. A.

Elevation provenance affects photosynthesis and its acclimation to temperature in the high-Andes alpine herb Phacelia secunda

WILEY

PLANT BIOLOGY

en

We analysed whether Phacelia secunda populations from different elevations exhibit intrinsic traits associated with diffusive and biochemical components of photosynthesis, and if they differ in acclimation of photosynthesis to warmer temperatures. We hypothesized that P. secunda will have similar photosynthetic performance regardless of altitudinal provenance and that plants from high elevations will have a lower photosynthetic acclimation capacity to higher temperature than plants from low elevations. Plants from 1600, 2800 and 3600ma.s.l. in the central Chilean Andes were collected and grown under two temperature regimes (20/16 degrees C and 30/26 degrees C day/night). The following photosynthetic traits were measured in each plant for the two temperature regimes: A(N), g(s), g(m), J(max), V-cmax, Rubisco carboxylation k(cat)(c). Under a common growth environment, plants from the highest elevation had slightly lower CO2 assimilation rates compared to lower elevation plants. While diffusive components of photosynthesis increased with elevation provenance, the biochemical component decreased, suggesting compensation that explains the similar rates of photosynthesis among elevation provenances. Plants from high elevations had lower photosynthetic acclimation to warmer temperatures compared to plants from lower elevations, and these responses were related to elevational changes in diffusional and biochemical components of photosynthesis. Plants of P. secunda from different elevations maintain photosynthetic traits when grown in a common environment, suggesting low plasticity to respond to future climate changes. The fact that high elevation plants had lower photosynthetic acclimation to warmer temperature suggests higher susceptibility to increases in temperature associated with global warming.

2023

artículo original

10.1111/plb.13539

PDF

Alpine plants

mesophyll conductance

photosynthetic limitations

Rubisco

temperature acclimation

Ciencias de las plantas

Plantas alpinas

conductancia del mesófilo

limitaciones fotosintéticas

Rubisco

aclimatación a la temperatura

793.0

802

artículo original

versión publicada

metadata

metadata

WOS:001003821600001

1435-8603

hibrida

Ciencias de las plantas