Repositorio
Institucional

Gago, Jorge

Nadal, Miquel

Clemente-Moreno, Maria Jose

Figueroa, Carlos Maria

Medeiros, David Barbosa

Cubo-Ribas, Neus

Cavieres, Lohengrin Alexis

Gulias, Javier

Fernie, Alisdair Robert

Flexas, Jaume

Bravo, Leon Aloys

Nutrient availability regulates Deschampsia antarctica photosynthetic and stress tolerance performance in Antarctica

OXFORD UNIV PRESS

JOURNAL OF EXPERIMENTAL BOTANY

en

Deschampsia antarctica is one of the only two native vascular plants in Antarctica, mostly located in the ice-free areas of the Peninsula's coast and adjacent islands. This region is characterized by a short growing season, frequent extreme climatic events, and soils with reduced nutrient availability. However, it is unknown whether its photosynthetic and stress tolerance mechanisms are affected by the availability of nutrients to deal with this particular environment. We studied the photosynthetic, primary metabolic, and stress tolerance performance of D. antarctica plants growing on three close sites (< 500 m) with contrasting soil nutrient conditions. Plants from all sites showed similar photosynthetic rates, but mesophyll conductance and photobiochemistry were more limiting (similar to 25%) in plants growing on low-nutrient availability soils. Additionally, these plants showed higher stress levels and larger investments in photoprotection and carbon pools, most probably driven by the need to stabilize proteins and membranes, and remodel cell walls. In contrast, when nutrients were readily available, plants shifted their carbon investment towards amino acids related to osmoprotection, growth, antioxidants, and polyamines, leading to vigorous plants without appreciable levels of stress. Taken together, these findings demonstrate that D. antarctica displays differential physiological performances to cope with adverse conditions depending on resource availability, allowing it to maximize stress tolerance without jeopardizing photosynthetic capacity.

2023

artículo original

10.1093/jxb/erad043

PDF

Mesophyll conductance

nutrient mobilization

photobiochemistry

photosynthetic limitations

polyamines

primary metabolism

stomatal conductance

Ciencias de las plantas

conductancia del mesófilo

movilización de nutrientes

fotobioquímica

limitaciones fotosintéticas

poliaminas

metabolismo primario

conductancia estomática

2620.0

2637

artículo original

versión publicada

acceso abierto

acceso abierto

WOS:000951242700001

0022-0957

verde# dorado

Ciencias de las plantas

ERDF PGC2018-093824-B-C41

MICINN MCIN/AEI/10.13039/501100011033

ERDF PID2019-107434GA-I00