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Distinct controls of leaf widening and elongation by light and evaporative demand in maize.

Sébastien Lacube,C. Fournier,Carine Palaffre,Emilie J. Millet,F. Tardieu,B. Parent

Published 2017 in Plant, Cell and Environment

ABSTRACT

Leaf expansion depends on both carbon and water availabilities. In cereals, most of experimental effort has focused on leaf elongation, with essentially hydraulic effects. We have tested if evaporative demand and light could have distinct effects on leaf elongation and widening, and if short-term effects could translate into final leaf dimensions. For that, we have monitored leaf widening and elongation in a field experiment with temporary shading, and in a platform experiment with 15 min temporal resolution and contrasting evaporative demands. Leaf widening showed a strong (positive) sensitivity to whole-plant intercepted light and no response to evaporative demand. Leaf elongation was (negatively) sensitive to evaporative demand, without effect of intercepted light per se. We have successfully tested resulting equations to predict leaf length and width in an external dataset of 15 field and six platform experiments. These effects also applied to a panel of 251 maize hybrids. Leaf length and width presented quantitative trait loci (QTLs) whose allelic effects largely differed between both dimensions but were consistent in the field and the platform, with high QTL × Environment interaction. It is therefore worthwhile to identify the genetic and environmental controls of leaf width and leaf length for prediction of plant leaf area.

PUBLICATION RECORD

  • Publication year

    2017

  • Venue

    Plant, Cell and Environment

  • Publication date

    2017-09-01

  • Fields of study

    Agricultural and Food Sciences, Medicine, Biology, Environmental Science

  • Identifiers
    DOI 10.1111/pce.13005PMID 28639691
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar, PubMed

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