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Open AccessArticle

Leaf Production and Expansion: A Generalized Response to Drought Stresses from Cells to Whole Leaf Biomass—A Case Study in the Tomato Compound Leaf

1
Univ Montpellier, INRA, Montpellier SupAgro, LEPSE, 34095 Montpellier, France
2
Unité Plantes et Systèmes de culture Horticoles, INRA, UR 1115 PSH, F-84000 Avignon, France
3
Université Côte d’Azur, INRA, CNRS, ISA, 06903 Sophia-Antipolis, France
4
Université Côte d’Azur, INRIA, INRA, CNRS, Sorbonne Université, BIOCORE Team, 06903 Sophia-Antipolis, France
5
Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, AGAP, 34095 Montpellier, France
*
Author to whom correspondence should be addressed.
The author deceased.
Plants 2019, 8(10), 409; https://doi.org/10.3390/plants8100409
Received: 4 September 2019 / Revised: 1 October 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue From Genes to Shape and Function: Leaf Morphogenesis at Play)
It is clearly established that there is not a unique response to soil water deficit but that there are as many responses as soil water deficit characteristics: Drought intensity, drought duration, and drought position during plant cycle. For a same soil water deficit, responses can also differ on plant genotype within a same species. In spite of this variability, at least for leaf production and expansion processes, robust tendencies can be extracted from the literature when similar watering regimes are compared. Here, we present response curves and multi-scale dynamics analyses established on tomato plants exposed to different soil water deficit treatments. Results reinforce the trends already observed for other species: Reduction in plant leaf biomass under water stress was due to reduction in individual leaf biomass and areas whereas leaf production and specific leaf area were not affected. The dynamics of leaf expansion was modified both at the leaf and cell scales. Cell division and expansion were reduced by drought treatments as well as the endoreduplication process. Combining response curves analyses together with dynamic analyses of tomato compound leaf growth at different scales not only corroborate results on simple leaf responses to drought but also increases our knowledge on the cellular mechanisms behind leaf growth plasticity. View Full-Text
Keywords: leaf growth; leaf production; cell division; cell expansion; endoreduplication; drought; plasticity; tomato leaf growth; leaf production; cell division; cell expansion; endoreduplication; drought; plasticity; tomato
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Koch, G.; Rolland, G.; Dauzat, M.; Bédiée, A.; Baldazzi, V.; Bertin, N.; Guédon, Y.; Granier, C. Leaf Production and Expansion: A Generalized Response to Drought Stresses from Cells to Whole Leaf Biomass—A Case Study in the Tomato Compound Leaf. Plants 2019, 8, 409.

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