期刊
PLANT CELL AND ENVIRONMENT
卷 37, 期 11, 页码 2470-2490出版社
WILEY
DOI: 10.1111/pce.12325
关键词
Eucalyptus dumosa; Eucalyptus pauciflora; drought; iWUE; online carbon isotope discrimination; oxidative stress; refixation CO2; respiration; re-watering
资金
- Regional Government of Madrid
- project 'ECOFISEPI' [AGL2011-25365]
- Fundacion Gonzalez Esparcia
- Consejo Social de la Universidad Politecnica de Madrid
- REGENFOR-CM [S2009AMB-1668]
- Australian Research Council
Water stress (WS) slows growth and photosynthesis (A(n)), but most knowledge comes from short-time studies that do not account for longer term acclimation processes that are especially relevant in tree species. Using two Eucalyptus species that contrast in drought tolerance, we induced moderate and severe water deficits by withholding water until stomatal conductance (g(sw)) decreased to two pre-defined values for 24 d, WS was maintained at the target g(sw) for 29 d and then plants were re-watered. Additionally, we developed new equations to simulate the effect on mesophyll conductance (g(m)) of accounting for the resistance to refixation of CO2. The diffusive limitations to CO2, dominated by the stomata, were the most important constraints to A(n). Full recovery of A(n) was reached after re-watering, characterized by quick recovery of g(m) and even higher biochemical capacity, in contrast to the slower recovery of g(sw). The acclimation to long-term WS led to decreased mesophyll and biochemical limitations, in contrast to studies in which stress was imposed more rapidly. Finally, we provide evidence that higher g(m) under WS contributes to higher intrinsic water-use efficiency (iWUE) and reduces the leaf oxidative stress, highlighting the importance of g(m) as a target for breeding/genetic engineering.
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