Growth potential limits drought morphological plasticity in seedlings from six Eucalyptus provenances

Tree Physiology
Pablo H Maseda, Roberto J Fernández

Abstract

Water stress modifies plant above- vs belowground biomass allocation, i.e., morphological plasticity. It is known that all species and genotypes reduce their growth rate in response to stress, but in the case of water stress it is unclear whether the magnitude of such reduction is linked to the genotype's growth potential, and whether the reduction can be largely attributed to morphological adjustments such as plant allocation and leaf and root anatomy. We subjected seedlings of six seed sources, three from each of Eucalyptus camaldulensis (potentially fast growing) and E. globulus (inherently slow growing), to three experimental water regimes. Biomass, leaf area and root length were measured in a 6-month glasshouse experiment. We then performed functional growth analysis of relative growth rate (RGR), and aboveground (leaf area ratio (LAR), specific leaf area (SLA) and leaf mass ratio (LMR)) and belowground (root length ratio (RLR), specific root length (SRL) and root mass ratio (RMR)) morphological components. Total biomass, root biomass and leaf area were reduced for all Eucalyptus provenances according to drought intensity. All populations exhibited drought plasticity, while those of greater growth potential (RGRmax) had a ...Continue Reading

References

Mar 12, 2005·The New Phytologist·Hans de KroonJan M van Groenendael
Mar 1, 1985·Plant Physiology·M D Snow, D T Tingey
Nov 3, 2006·Journal of Experimental Botany·Pablo H Maseda, Roberto J Fernández
Oct 17, 2007·Tree Physiology·Jennifer L FunkManuel T Lerdau
Nov 14, 2007·The New Phytologist·Fernando ValladaresJosé M Gómez
Oct 1, 2003·American Journal of Botany·Katherine A Preston, David D Ackerly

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Citations

Feb 11, 2020·Frontiers in Plant Science·Renée M MarchinDavid S Ellsworth

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