2024-03-29T14:33:38Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1935192021-12-28T16:07:28Zcom_10261_118com_10261_6col_10261_371
2019-10-25T14:10:57Z
urn:hdl:10261/193519
Physiological, hormonal and metabolic responses of two alfalfa cultivars with contrasting responses to drought
Soba, David
Zhou, Bangwei
Arrese-Igor, César
Munné-Bosch, Sergi
Aranjuelo, Iker
Universidad de Navarra
Consejo Superior de Investigaciones Científicas (España)
Alfalfa
Drought
Hormones
Metabolites
N/C metabolism
Nodule
Physiology
Alfalfa (Medicago sativa L.) is frequently constrained by environmental conditions such as drought. Within this context, it is crucial to identify the physiological and metabolic traits conferring a better performance under stressful conditions. In the current study, two alfalfa cultivars (San Isidro and Zhong Mu) with different physiological strategies were selected and subjected to water limitation conditions. Together with the physiological analyses, we proceeded to characterize the isotopic, hormone, and metabolic profiles of the different plants. According to physiological and isotopic data, Zhong Mu has a water-saver strategy, reducing water lost by closing its stomata but fixing less carbon by photosynthesis, and therefore limiting its growth under water-stressed conditions. In contrast, San Isidro has enhanced root growth to replace the water lost through transpiration due to its more open stomata, thus maintaining its biomass. Zhong Mu nodules were less able to maintain nodule N2 fixing activity (matching plant nitrogen (N) demand). Our data suggest that this cultivar-specific performance is linked to Asn accumulation and its consequent N-feedback nitrogenase inhibition. Additionally, we observed a hormonal reorchestration in both cultivars under drought. Therefore, our results showed an intra-specific response to drought at physiological and metabolic levels in the two alfalfa cultivars studied.
2019-10-25T14:10:57Z
2019-10-25T14:10:57Z
2019-10-15
2019-10-25T14:10:57Z
artículo
International Journal of Molecular Sciences 20(20): 5099 (2019)
http://hdl.handle.net/10261/193519
10.3390/ijms20205099
1422-0067
http://dx.doi.org/10.13039/501100003339
http://dx.doi.org/10.13039/501100004435
31618819
en
Publisher's version
https://doi.org/10.3390/ijms20205099
Sí
http://creativecommons.org/licenses/by/4.0/
openAccess
Multidisciplinary Digital Publishing Institute