Journal Article

Impact of successive drought and re-watering cycles on growth and specific leaf area of two <i>Populus</i> × <i>canadensis</i> (Moench) clones, ‘Dorskamp’ and ‘Luisa_Avanzo’

Nicolas Marron, Erwin Dreyer, Eric Boudouresque, Didier Delay, Jean-Michel Petit, Francis M. Delmotte and Franck Brignolas

in Tree Physiology

Volume 23, issue 18, pages 1225-1235
Published in print December 2003 | ISSN: 0829-318X
Published online December 2003 | e-ISSN: 1758-4469 | DOI: https://dx.doi.org/10.1093/treephys/23.18.1225
Impact of successive drought and re-watering cycles on growth and specific leaf area of two Populus × canadensis (Moench) clones, ‘Dorskamp’ and ‘Luisa_Avanzo’

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Responses to successive drought and re-watering cycles (1–3 cycles) were compared in greenhouse-grown cuttings of Populus × canadensis (Moench) clones, ‘Luisa_Avanzo’ and ‘Dorskamp.’ Total leaf number increment rate, duration of leaf expansion, total and individual leaf area expansion rates and stomatal conductance were recorded periodically during the experiment. Soil water content (SWC) and predawn leaf water potential (ΨWP) were measured four times during each drought cycle. In parallel, relative leaf water content (RWC) and specific leaf area (SLA) were estimated on leaves collected from the top to bottom of each cutting. Under well-watered conditions, ‘Luisa_Avanzo’ and ‘Dorskamp’ differed in their patterns of leaf area expansion. Although duration of leaf expansion was similar between clones, ‘Luisa_Avanzo’ exhibited higher total leaf number increment rates and individual leaf area increases than ‘Dorskamp.’ As a result, ‘Luisa_Avanzo’ cuttings reached larger individual and total leaf areas than ‘Dorskamp.’ ‘Dorskamp’ leaves had lower SLA than ‘Luisa_Avanzo’ leaves. In response to successive drought cycles, both clones underwent decreases in total leaf number increment rates and in total leaf area expansion rates, but both whole-plant and individual leaf areas were drastically reduced only in ‘Luisa_Avanzo.’ ‘Dorskamp’ maintained a constant leaf area as a result of an increase in the duration of leaf expansion during drought and a significant stimulation of individual leaf area expansion rate and total leaf number increment rate in response to re-watering. Drought caused a greater decrease in SLA in ‘Luisa_Avanzo’ than in ‘Dorskamp.’ Expanded leaves of ‘Dorskamp’ were constitutively dense or thick, or both, whereas leaves of ‘Luisa_Avanzo’ became dense or thick, or both, only in response to drought. In both clones, re-watering caused partial recovery of SLA to control values. Our data confirm previous field and greenhouse observations that ‘Dorskamp’ is more tolerant to successive drought and re-watering cycles than ‘Luisa_Avanzo.’ We conclude that this difference is mainly attributable to the plasticity of ‘Dorskamp’ after re-watering, rather than to clonal differences in drought responses.

Keywords: duration of leaf expansion; individual leaf growth; predawn leaf water potential; relative leaf water content; soil water content; stomatal conductance

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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