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Root growth plasticity to drought in seedlings of perennial grasses
- Source :
- Plant and Soil, Plant and Soil, 2019, 440 (1-2), pp.551-568. ⟨10.1007/s11104-019-04117-7⟩, Plant and Soil, Springer Verlag, 2019, 440 (1-2), pp.551-568. ⟨10.1007/s11104-019-04117-7⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; Aim Root growth strategies may be critical for seeding survival and establishment under dry conditions, but these strategies and their plasticity are little known. We aim to document the ability of young grass seedlings to adjust their root system architecture, root morphology and biomass allocation to roots to promote water uptake and survival under progressive drought.Methods: Seedlings growing in columns filled with sand and exposed to drought or well-watered controls were repeatedly harvested for determination of biomass fractions , root length, −architecture and-morphology in a greenhouse experiment. Allometric scaling exponents and standardised major axis regression were used to investigate allocation patterns.Results: Young seedlings were able to sustain leaf turgor and functions during eight weeks of progressive drought through phenotypic plasticity of the primary root system producing deeper and simpler roots. Biomass allocation to roots decreased or did not respond, and other components of root morphology showed only moderate plasticity.Conclusion: Our results suggest that morphological and architectural plasticity of the primary root system may well be key features for dehydration avoidance and survival in grass seedlings under moderate drought when allocation of biomass to roots and development of secondary roots are constrained.
- Subjects :
- 0106 biological sciences
Perennial plant
Turgor pressure
Soil Science
Greenhouse
Plant Science
Root system
Biology
01 natural sciences
Root system architecture
2. Zero hunger
Biomass (ecology)
Phenotypic plasticity
Allometry
Seedling strategies
Plant physiology
food and beverages
04 agricultural and veterinary sciences
15. Life on land
[SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics
Agronomy
Rooting depth
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 0032079X and 15735036
- Database :
- OpenAIRE
- Journal :
- Plant and Soil, Plant and Soil, 2019, 440 (1-2), pp.551-568. ⟨10.1007/s11104-019-04117-7⟩, Plant and Soil, Springer Verlag, 2019, 440 (1-2), pp.551-568. ⟨10.1007/s11104-019-04117-7⟩
- Accession number :
- edsair.doi.dedup.....e655f068d75cba5cd403614891a8c414