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Plant ammonium sensitivity is associated with external pH adaptation, repertoire of nitrogen transporters, and nitrogen requirement
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Orientador(es)
Resumo(s)
Modern crops exhibit diverse sensitivities to ammonium as the primary nitrogen source, influenced by environmental
factors such as external pH and nutrient availability. Despite its significance, there is currently no systematic clas-
sification of plant species based on their ammonium sensitivity. We conducted a meta-analysis of 50 plant species
and present a new classification method based on the comparison of fresh biomass obtained under ammonium and
nitrate nutrition. The classification uses the natural logarithm of the biomass ratio as the size effect indicator of am-
monium sensitivity. This numerical parameter is associated with critical factors for nitrogen demand and form pref-
erence, such as Ellenberg indicators and the repertoire of nitrogen transporters for ammonium and nitrate uptake.
Finally, a comparative analysis of the developmental and metabolic responses, including hormonal balance, is con-
ducted in two species with divergent ammonium sensitivity values in the classification. Results indicate that nitrate
has a key role in counteracting ammonium toxicity in species with a higher abundance of genes encoding NRT2-type
proteins and fewer of those encoding the AMT2-type proteins. Additionally, the study demonstrates the reliability of
the phytohormone balance and methylglyoxal content as indicators for anticipating ammonium toxicity.
Descrição
Palavras-chave
Ammonium sensitivity ammonium transporters (AMTs) Ellenberg indicator high-affinity nitrate transporter (NRT2) methylglyoxal nitrogen uptake pH adaptation phytohormonal balance
Contexto Educativo
Citação
Mikel Rivero-Marcos, Berta Lasa, Tomé Neves, Ángel M Zamarreño, José M García-Mina, Carmen García-Olaverri, Pedro M Aparicio-Tejo, Cristina Cruz, Idoia Ariz, Plant ammonium sensitivity is associated with external pH adaptation, repertoire of nitrogen transporters, and nitrogen requirement, Journal of Experimental Botany, Volume 75, Issue 11, 7 June 2024, Pages 3557–3578, https://doi.org/10.1093/jxb/erae106
Editora
Oxford Academic