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Title: Maize (Zea mays L.) root exudation profiles change in quality and quantity during plant development : a field study
Author(s): Santangeli, Michael
Steininger-Mairinger, Teresa
Vetterlein, DorisLook up in the Integrated Authority File of the German National Library
Hann, StephanLook up in the Integrated Authority File of the German National Library
Oburger, Eva
Issue Date: 2024
Type: Article
Language: English
Abstract: Deciphering root exudate composition of soil-grown plants is considered a crucial step to better understand plant–soil–microbe interactions affecting plant growth performance. In this study, two genotypes of Zea mays L. (WT, rth3) differing in root hair elongation were grown in the field in two substrates (sand, loam) in custom-made, perforated columns inserted into the field plots. Root exudates were collected at different plant developmental stages (BBCH 14, 19, 59, 83) using a soil-hydroponic-hybrid exudation sampling approach. Exudates were characterized by LC-MS based non-targeted metabolomics, as well as by photometric assays targeting total dissolved organic carbon, soluble carbohydrates, proteins, amino acids, and phenolics. Results showed that plant developmental stage was the main driver shaping both the composition and quantity of exuded compounds. Carbon (C) exudation per plant increased with increasing biomass production over time, while C exudation rate per cm² root surface area h−1 decreased with plant maturity. Furthermore, exudation rates were higher in the substrate with lower nutrient mobility (i.e., loam). Surprisingly, we observed higher exudation rates in the root hairless rth3 mutant compared to the root hair-forming WT sibling, though exudate metabolite composition remained similar. Our results highlight the impact of plant developmental stage on the plant–soil–microbe interplay.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: Plant science
Publisher: Elsevier Science
Publisher Place: Amsterdam [u.a.]
Volume: 338
Original Publication: 10.1016/j.plantsci.2023.111896
Page Start: 1
Page End: 15
Appears in Collections:Open Access Publikationen der MLU

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