2026-04-17T15:49:30Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1267222025-12-05T09:45:06Zcom_2072_1057col_2072_478778col_2072_478917

00925njm 22002777a 4500 dc Molero Milán, Gemma author Tcherkez, Guillaume author Roca, Regina author Mauve, Caroline author Cabrera-Bosquet, Llorenç author Araus Ortega, José Luis author Nogués Mestres, Salvador author Aranjuelo Michelena, Iker author 2018-12-04T14:43:37Z 2021-02-01T06:10:16Z 2019-02-01 2018-12-04T14:43:37Z Drought is one of the most limiting factors on crop productivity under Mediterranean conditions, where the leguminous species alfalfa (Medicago sativa L.) is extensively cultivated. Whereas the effect of drought on plant performance has been widely described at leaf and nodule levels, less attention has been given to plant-nodule interactions and their implication on metabolites exchange during a regrowth period, when water is limiting. For this purpose, physiological characterization and metabolite profiles in different plant organs and nodules were undertaken under water deficit, including regrowth after removal of aerial parts. In order to study in more detail how nitrogen (N) metabolism was affected by water stress, plants were labelled with Nenriched isotopic air (15N2) using especially designed chambers. Water stress affected negatively water status and photosynthetic machinery. Metabolite profile and isotopic composition analyses revealed that, water deficit induced major changes in the accumulation of amino acids (proline, asparagine, histidine, lysine and cysteine), carbohydrates (sucrose, xylose and pinitol) and organic acids (fumarate, succinate and maleic acid) in the nodules in comparison with other organs. The lower 15N-labeling observed in serine, compared with other amino acids, was related with its high turnover rate, which in turn, indicates its potential implication in photorespiration. Isotopic analysis of amino acids also revealed that proline synthesis in the nodule was a local response to water stress and not associated with a feedback inhibition from the leaves.. Water deficit induced extensive reprogramming of wholeplant C and N metabolism, including when the aerial part was removed to trigger regrowth. Sequeres Creixement (Plantes) Droughts Growth (Plants) Crops Conreus Do metabolic changes underpin physiological responses to water limitation in alfalfa (Medicago sativa) plants during a regrowth period?