Differential metabolic rearrangements in the roots and leaves of Cicer arietinum caused by single or double nitrate and/or phosphate deficiencies

Abstract

Nitrate (NO 3 À) and phosphate (Pi) deficiencies are the major constraints for chickpea productivity, significantly impacting global food security. However, excessive fertilization is expensive and can also lead to environmental pollution. Therefore, there is an urgent need to develop chickpea cultivars that are able to grow on soils deficient in both NO 3 À and Pi. This study focused on the identification of key NO 3 À and/or Pi starvation-responsive metabolic pathways in the leaves and roots of chickpea grown under single and double nutrient deficiencies of NO 3 À and Pi, in comparison with nutrient-sufficient conditions. A global metabolite analysis revealed organ-specific differences in the metabolic adaptation to nutrient deficiencies. Moreover, we found stronger adaptive responses in the roots and leaves to any single than combined nutrient-deficient stresses. For example, chickpea enhanced the allocation of carbon among nitrogen-rich amino acids (AAs) and increased the production of organic acids in roots under NO 3 À deficiency, whereas this adaptive response was not found under double nutrient deficiency. Nitrogen remobilization through the transport of AAs from leaves to roots was greater under NO 3 À deficiency than double nutrient deficiency conditions. Glucose-6-phosphate and fructose-6-phosphate accumulated in the roots under single nutrient deficiencies, but not under double nutrient deficiency, and higher glycolytic pathway activities were observed in both roots and leaves under single nutrient deficiency than double nutrient deficiency. Hence, the simultaneous deficiency generated a unique profile of metabolic changes that could not be simply described as the result of the combined deficiencies of the two nutrients.

Comparative physiological, metabolomic, and transcriptomic analyses reveal mechanisms of apple dwarfing rootstock root morphogenesis under nitrogen and/or phosphorus deficient conditions

“…In agricultural systems, plants often suffer from N and Pi co-limitation. Combined N and P deficiencies lead to a series of adaptive responses that cannot be ascribed simply to the combined deficiency ( Pueyo et al., 2021 ; Nasr Esfahani et al., 2022 ). In chickpea, although molecular responses under combined N and P deficiency are weaker than those seen under deficiency of a single nutrient, simultaneous deficiency produces unique metabolic characteristics ( Nasr Esfahani et al., 2021 ; Nasr Esfahani et al., 2022 ).…”

“…Combined N and P deficiencies lead to a series of adaptive responses that cannot be ascribed simply to the combined deficiency ( Pueyo et al., 2021 ; Nasr Esfahani et al., 2022 ). In chickpea, although molecular responses under combined N and P deficiency are weaker than those seen under deficiency of a single nutrient, simultaneous deficiency produces unique metabolic characteristics ( Nasr Esfahani et al., 2021 ; Nasr Esfahani et al., 2022 ). Investigations of transcriptome responses to combined N and P deficiency have been performed in Arabidopsis thaliana ( Medici et al., 2015 ), rice ( Oryza sativa ) ( Cai et al., 2013 ), Medicago truncatula ( Bonneau et al., 2013 ), and giant duckweed ( Spirodela polyrhiza ) ( Yang et al., 2022 ), etc.…”