Physiological Responses of N2-Fixing Legumes to Water Limitation

González, Esther M.; Larrainzar, Estíbaliz; Wienkoop, Stefanie; Gil‐Quintana, Erena; Arrese‐Igor, Cesar

doi:10.1007/978-3-319-06212-9_2

Cited by 16 publications

(19 citation statements)

References 198 publications

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“…WD and Pi deficiency are critical limiting abiotic stressors that negatively impact the nodulation, BNF, and thus legume growth and productivity worldwide (Sinclair et al, 2007 ; Tesfaye et al, 2007 ). To properly perform BNF under a combined stress of WD and Pi deficiency, legume plants should develop adequate mechanisms to efficiently use available soil-Pi, and to cope with WD, such as tolerance- and/or escape- and/or avoidance-related mechanisms (Vance, 2001 ; Sulieman et al, 2013 ; Nasr Esfahani et al, 2014 ; González et al, 2015 ). Cowpea plants grown in smallholder farms of the tropical countries should also fulfill these criteria to achieve the efficient BNF potential to satisfy their N demand, as well as the demand of other plants for an economic benefit and sustainability of N in cropping systems.…”

Section: Discussionmentioning

confidence: 99%

Comparative Analysis of the Combined Effects of Different Water and Phosphate Levels on Growth and Biological Nitrogen Fixation of Nine Cowpea Varieties

et al. 2017

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Water deficit and phosphate (Pi) deficiency adversely affect growth and biological nitrogen fixation (BNF) of legume crops. In this study, we examined the impact of interaction between soil water conditions and available soil-Pi levels on growth, nodule development and BNF potential of nine cowpea varieties grown on dry savanna soils. In our experimental design, soils with different available soil-Pi levels, i.e., low, moderate, and high soil-Pi levels, collected from various farming fields were used to grow nine cowpea varieties under well-watered and water-deficit conditions. Significant and severe water deficit-damaging effects on BNF, nodulation, growth, levels of plant-nitrogen (N) and -phosphorus (P), as well as shoot relative water content and chlorophyll content of cowpea plants were observed. Under well-watered and high available soil-Pi conditions, cowpea varieties IT07K-304-9 and Dan'Ila exhibited significantly higher BNF potential and dry biomass, as well as plant-N and -P contents compared with other tested ones. Significant genotypic variations among the cowpeas were recorded under low available soil-Pi and water-deficit conditions in terms of the BNF potential. Principal component (PC) analysis revealed that varieties IT04K-339-1, IT07K-188-49, IT07K-304-9, and IT04K-405-5 were associated with PC1, which was better explained by performance for nodulation, plant biomass, plant-N, plant-P, and BNF potential under the combined stress of water deficit and Pi deficiency, thereby offering prospects for development of varieties with high growth and BNF traits that are adaptive to such stress conditions in the region. On another hand, variety Dan'Ila was significantly related to PC2 that was highly explained by the plant shoot/root ratio and chlorophyll content, suggesting the existence of physiological and morphological adjustments to cope with water deficit and Pi deficiency for this particular variety. Additionally, increases in soil-Pi availability led to significant reductions of water-deficit damage on dry biomass, plant-N and -P contents, and BNF potential of cowpea varieties. This finding suggests that integrated nutrient management strategies that allow farmers to access to Pi-based fertilizers may help reduce the damage of adverse water deficit and Pi deficiency caused to cowpea crop in the regions, where soils are predominantly Pi-deficient and drought-prone.

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Section: Discussionmentioning

confidence: 99%

Comparative Analysis of the Combined Effects of Different Water and Phosphate Levels on Growth and Biological Nitrogen Fixation of Nine Cowpea Varieties

et al. 2017

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“…As the lower limit of the irrigation amount increased, the SMC increased, and the air permeability of the soil decreased. The growth of N-fixing bacteria is aerobic and requires a relatively high SMC [49]. As the lower limit of the irrigation amount increased from 50% to 60% of SAW, the abundance of N fixation-related genes increased, possibly because the moderate level of SMC and the soil wet/dry frequency created a beneficial soil environment.…”

Section: The Relatively Low Soil Wet/dry Alternating Frequency By Adimentioning

confidence: 99%

Nitrogen and Phosphorus Absorption and Yield of Tomato Increased by Regulating the Bacterial Community under Greenhouse Conditions via the Alternate Drip Irrigation Method

Wang

Niu

2020

Agronomy

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Alternate drip irrigation (ADI) is a useful irrigation method for water conservation and the regulation of soil quality; however, knowledge about the underlying mechanism of soil-root-bacterium interactions is limited. To determine the mechanism by which ADI transforms soil nutrients and thereby promotes plant growth and to provide a basis for the reasonable selection of drip irrigation methodology, the present study investigated the effects of ADI on the composition and potential function of the bacterial community in tomato rhizosphere soils under greenhouse conditions and analyzed the soil-root-bacterium interactions under ADI. The results revealed that, compared with the soils of the plots treated with surface drip irrigation with plastic film mulching (DI-PFM), the soils of the plots treated with ADI presented an optimized bacterial community structure and optimized soil nitrogen (N) and phosphorus (P) metabolism. The soil available N contents under ADI with lower irrigation limits of 50%, 60%, and 70% of field capacity (A50, A60, and A70 treatments, respectively) were 1.48, 2.19, and 1.91 times greater than those under DI-PFM, respectively; similarly, the soil available P contents were 1.49, 1.65, and 2.91 times greater; the total phosphorus (TP) contents in the tomato roots were 1.06, 1.94, and 1.59 times greater, respectively; and the TP contents in the tomato plants were 1.03, 1.75, and 2.84 times greater, respectively. In addition, the total nitrogen (TN) contents in the tomato roots under ADI with lower irrigation limits of 60% and 70% of field capacity were 1.07 and 1.14 times greater than those under DI-PFM, and the TN contents in the tomato stems were 1.21 and 1.12 times greater than those under DI-PFM. However, compared with DI-PFM, ADI improved tomato yields by 24.23% under only 70% of field capacity. Therefore, ADI significantly enhanced soil-root interactions and stimulated the activation of soil N and P, but only a proper low soil moisture content (SMC) led to significantly increased tomato yields.

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“…In a broader context, structural responses to stresses may be as important as physiological changes to improve overall susceptibility [26][27][28]. Drought impact on symbiotic interactions, such as nitrogen fixation in legumes [29], or on mycorrhizal symbiosis [30], is a further important mechanism to influence the overall performance of crop plants.…”

Section: Impact Of Global Change On Plant Nutrient Dynamicsmentioning

confidence: 99%