RT info:eu-repo/semantics/article
T1 Fast growth involves high dependence on stored resources for shoot growth in Mediterranean evergreen trees
A1 Uscola Fernández, María Mercedes
A1 Villar Salvador, Pedro
A1 Gross , Patrick
A1 Maillard , Pascale
K1 13C
K1 labelling
K1 15N
K1 Olea europaea
K1 Pinus halepensis
K1 Quercus ilex
K1 Quercus coccifera
K1 remobilization
K1 reserves
K1 spring growth
K1 Medio Ambiente
K1 Environmental science
AB Background and Aims The carbon (C) and nitrogen (N) needed for plant growth can come either from soil Nand current photosynthesis or through remobilization of stored resources. The contribution of remobilization to neworgan growth on a whole-plant basis is quite well known in deciduous woody plants and evergreen conifers, but thisinformation is very limited in broadleaf evergreen trees. This study compares the contribution of remobilized C andN to the construction of new organs in spring, and assesses the importance of different organs as C and N sources in1-year-old potted seedlings of four ecologically distinct evergreen Mediterranean trees, namely Quercus ilex, Q.coccifera, Olea europaea and Pinus hapelensis.  Methods Dual 13C and 15N isotope labelling was used to unravel the contribution of currently taken up and storedC and N to new growth. Stored C was labelled under simulated winter conditions. Soil N was labelled with the fertilizationduring the spring growth.  Key results Oaks allocated most C assimilated under simulated winter conditions to coarse roots, while O. europaeaand P. halepensis allocated it to the leaves. Remobilization was the main N source (>74 %) for new fine-rootgrowth in early spring, but by mid-spring soil supplied most of the N required for new growth (>64 %). Currentphotosynthesis supplied >60 % of the C in new fine roots by mid-spring in most species. Across species, the proportionof remobilized C and N in new shoots increased with the relative growth rate
SN 0305-7364
YR 2015
FD 2015
LK http://hdl.handle.net/10017/37406
UL http://hdl.handle.net/10017/37406
LA eng
NO Comunidad de Madrid
DS MINDS@UW
RD 20-abr-2024