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Does elevated [CO2] only increase root growth in the topsoil_A face study with lentil in a semi-arid environment.pdf (861.24 kB)

Does elevated [CO2] only increase root growth in the topsoil? A face study with lentil in a semi-arid environment

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posted on 2022-05-09, 01:57 authored by Maryse Bourgault, Sabine Tausz-Posch, Mark Greenwood, Markus Löw, Samuel Henty, Roger D Armstrong, Garry L O’Leary, Glenn J Fitzgerald, Michael Tausz
Atmospheric carbon dioxide concentrations [CO2] are increasing steadily. Some reports have shown that root growth in grain crops is mostly stimulated in the topsoil rather than evenly throughout the soil profile by e[CO2], which is not optimal for crops grown in semi-arid environments with strong reliance on stored water. An experiment was conducted during the 2014 and 2015 growing seasons with two lentil (Lens culinaris) genotypes grown under Free Air CO2 Enrichment (FACE) in which root growth was observed non-destructively with mini-rhizotrons approximately every 2–3 weeks. Root growth was not always statistically increased by e[CO2] and not consistently between depths and genotypes. In 2014, root growth in the top 15 cm of the soil profile (topsoil) was indeed increased by e[CO2], but increases at lower depths (30–45 cm) later in the season were greater than in the topsoil. In 2015, e[CO2] only increased root length in the topsoil for one genotype, potentially reflecting the lack of plant available soil water between 30–60 cm until recharged by irrigation during grain filling. Our limited data to compare responses to e[CO2] showed that root length increases in the topsoil were correlated with a lower yield response to e[CO2]. The increase in yield response was rather correlated with increases in root growth below 30 cm depth.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

10

Issue

4

Start Page

1

End Page

12

Number of Pages

12

eISSN

2223-7747

ISSN

2223-7747

Location

Switzerland

Publisher

MDPI

Publisher License

CC BY

Additional Rights

CC BY 4.0

Language

eng

Peer Reviewed

  • Yes

Open Access

  • Yes

Acceptance Date

2021-03-22

External Author Affiliations

University of Melbourne; Agriculture Victoria; University of Saskatchewan, Canada; Montana State University, USA

Author Research Institute

  • Institute for Future Farming Systems

Era Eligible

  • Yes

Medium

Electronic

Journal

Plants

Article Number

612

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