Sorgoleone concentration influences mycorrhizal colonization in sorghum
- PDF / 855,847 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 78 Downloads / 226 Views
SHORT NOTE
Sorgoleone concentration influences mycorrhizal colonization in sorghum Isabela Figueiredo de Oliveira1 · Maria Lúcia Ferreira Simeone2 · Cristiane Carvalho de Guimarães2 · Nathally Stefany Garcia3 · Robert Eugene Schaffert2 · Sylvia Morais de Sousa1,2 Received: 7 July 2020 / Accepted: 11 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The association between arbuscular mycorrhizal fungi (AMF) and sorghum, the fifth most cultivated cereal in the world and a staple food for many countries, is relevant to improving phosphorus (P) absorption. The importance of root exudation as a signal for the symbiosis has been shown for several species, but a complete understanding of the signaling molecules involved in the mycorrhizal symbiosis signaling pathway has not yet been elucidated. In this context, we investigated the effect of sorgoleone, one of the most studied allelochemicals and a predominant compound of root exudates in sorghum, on AMF colonization and consequently P uptake and plant growth on a sorghum genotype. The sorghum genotype P9401 presents low endogenous sorgoleone content, and when it was inoculated with Rhizophagus clarus together with 5 and 10 µM sorgoleone, mycorrhizal colonization was enhanced. A significant enhancement of mycorrhizal colonization and an increase of P content and biomass were observed when R. clarus was inoculated together with 20 µM sorgoleone. Thus, our results indicate that sorgoleone influences mycorrhizal colonization, but the mechanisms by which it does so still need to be revealed. Keywords P uptake · Plant growth · Sorghum bicolor · Striga-resistant genotype
Introduction Sorghum (Sorghum bicolor (L.) Moench) is the fifth most cultivated cereal in the world and is a staple food for many countries. Sorghum performance on tropical soils is the result of adaptations to multiple stress conditions, including tolerance to aluminum toxicity, efficient acquisition of phosphorus (P) which is highly unavailable in tropical soils being immobilized in aluminum and iron complexes, and tolerance to drought stress (Schlemper et al. 2017; Tibugari et al. 2018). In sorghum, an increase of P uptake can be promoted by several morphological and physiological * Sylvia Morais de Sousa [email protected] 1
Universidade Federal de São João del-Rei, R. Padre João Pimentel, 80, Dom Bosco, São João del‑Rei, Minas Gerais 36301‑158, Brazil
2
Empresa Brasileira de Pesquisa Agropecuária, Embrapa Milho e Sorgo, Rod. MG 424 KM 65, Sete Lagoas, Minas Gerais 35701‑970, Brazil
3
Universidade Federal de São João del-Rei, Rod. MG 424 KM 47, Sete Lagoas, Minas Gerais 35701‑970, Brazil
mechanisms such as alterations in root system morphology and architecture, modulation of P transporters, organic acid exudation, phosphatase secretion, and association with arbuscular mycorrhizal fungi (AMF) (Bernardino et al. 2019; Wen et al. 2019). The association between plants and AMF is relevant to increasing mineral nutrient acquisition (Wen et al. 2019; Abdel
Data Loading...
