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- Title
Rooting plasticity in wild and cultivated Andean <italic>Chenopodium</italic> species under soil water deficit.
- Authors
Alvarez-Flores, Ricardo; Nguyen-Thi-Truc, Anh; Peredo-Parada, Santiago; Joffre, Richard; Winkel, Thierry
- Abstract
Background and aims: Rooting plasticity is critical for plants exploiting patchy soil-water resources, but empirical evidence remains controversial due to complex root/soil interactions in natural and agricultural environments. We compared cultivated and wild <italic>Chenopodium</italic> populations from distinct agroecological background to assess their rooting plasticity when exposed to contrasting wet-dry soil profiles in a controlled environment.Methods: Four treatments of increasing dryness were applied during 6 weeks in plants of <italic>Chenopodium hircinum</italic>, <italic>Chenopodium pallidicaule</italic> and two ecotypes (wet- and dry-habitat) of <italic>Chenopodium quinoa</italic> grown in rhizotrons. Root system architecture and growth were sequentially mapped. At the end of the experiment, plant and root morphological traits and dry biomass were measured.Results: Contrary to the other two species, <italic>C. quinoa</italic> showed accelerated taproot growth in dry soil conditions. The dry-habitat <italic>C. quinoa</italic> ecotype showed consistently higher plant traits related to longer, coarser, and more numerous root segments which give it a faster taproot growth and sustained root branching at depth in dry soil.Conclusions: High rooting plasticity confers the advantage of fast root elongation and deep soil exploration under soil water deficit. Variation in intrinsic root traits and plastic responses among <italic>Chenopodium</italic> populations controls their root foraging capacity facing patchy soil-water resources.
- Subjects
GOOSEFOOTS; SOIL moisture; RHIZOTRONS; SEEDLINGS; PLANT growth
- Publication
Plant & Soil, 2018, Vol 425, Issue 1/2, p479
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-018-3588-7