Common bean is an ancient grain legume crop that has been cultivated in various parts of the world by humankind for centuries. The seeds of this crop contain valuable source of protein, minerals, and ...vitamins. It has recently gained attention as a functional food due to its potential for preventing human diseases and providing health benefits. Therefore, plant breeders are globally aimed for nutritional development to mitigate mineral deficiencies in developed and developing countries. In this study, the genotypes and cultivars were investigated in relation to the contents of N, P, K, Mg, Ca, Fe and Zn in four different field experiments at the Bolu and Ankara of Turkey. The field experiments were conducted in the years 2018 and 2019 at the Bolu location and in the years 2019 and 2020 at the Ankara location. Genotype × environment interaction was determined statistically significant (P < 0.01) in all mineral traits according to analysis of variance (ANOVA). Across all locations, the correlation analysis revealed positive associations between calcium (Ca) and magnesium (Mg) (r = 0.793 **), as well as between iron (Fe) and zinc (Zn) (r = 0.301 **). A total of 89.78% of cumulative variances in mineral traits were explained by the eigenvalues of the four principal components (PC). In the biplot analysis, the length and direction of the Ca, Mg and potassium (K) vectors in PC1 and Fe, and Zn vectors in PC2 effectively distinguished the genotypes. Across all locations, the Blck-7 genotype had high iron (93.76 mg kg−1) and zinc (25.40 mg kg−1) content. The Çnk-4 genotype was found as stable for all mineral traits in locations. Findings revealed that the utilization of the Çnk-4 and Blck-7 genotypes could significantly contribute to the improvement of dietary nutritional quality and positively impact human health. These genotypes also could be utilized as a parent to further biofortification studies to enhance the nutritional traits of common bean seeds.
•The genotypes/cultivars were evaluated for mineral traits in different environments.•All mineral contents were significantly influenced by genotype x environment (GEI).•Iron (Fe) and Zinc (Zn) contents revealed a positive correlation.•Blck-7 and Çnk-4 genotypes could improve the nutritional quality of common bean seed.
This paper reports the role of exogenous glycine betaine (25 and 50 mM GB at a rate of 50 mL per plant) in enhancing NaCl-stress tolerance in common bean (Phaseolus vulgaris L.). Irrigating plants by ...simulated saline water, containing 0, 50 and 100 mM sodium chloride (NaCl), significantly reduced the growth dynamics, photosynthetic pigments (i.e., Chl a, Chl b, and carotenoids), membrane stability index (MSI), relative water content (RWC), and pod yield. While, malondialdehyde (MDA), endogenous proline, and glutathione contents, electrolyte leakage (EL), antioxidant defense system, and Na+ accumulation markedly increased upon exposure to NaCl-stress. However, the application of exogenous GB significantly improved salt tolerance of common bean as it increased the antioxidant defense including both enzymatic (i.e., peroxidase, superoxide dismutase, and catalase) and nonenzymatic (i.e., proline and glutathione) agents. Consequently, MSI, RWC, EL, and photosynthetic pigments have been improved recording significantly higher values than the control. Moreover, the pod yield increased by 29.8 and 59.4% when plants grown under 50 and 100 mM NaCl, respectively, were sprayed with 25 mM GB. Our results show that GB-induced slat tolerance in common bean plants mainly depends on the osmoregulation effect of GB and to a lesser extent on its antioxidant capacity. Foliar application of GB significantly reduced the accumulation of Na+ and at the same time induced K+ uptake maintaining a higher K+/Na+ ratio. Despite some changes in the activities of antioxidant enzymes induced by the application of GB, no consistent contribution in the salt tolerance could be cited in this study. Therefore, we suggest that salt tolerance is largely unrelated to the antioxidant defense ability of GB in common bean. While the potential role of GB in ameliorating salt tolerance is mainly due to the adjustment of ions uptake through limiting Na+ uptake and alternatively increasing K+ accumulation in plant tissues.
•NaCl stress adversely affects the growth and development of common bean.•NaCl stress reduces RWC, MSI, photosynthetic pigments, and yield.•NaCl stress increased activity of CAT, POD, and SOD and proline and glutathione content.•Foliar application of glycine betaine induces salt tolerance through osmoregulation and antioxidant defense properties.•Glycine betaine mainly limits Na+ uptake and alternatively increases K+ accumulation.
Common bean (Phaseolus vulgaris L.) is a pulse cultivated worldwide and it is considered a nutraceutical food and a good source of protein. In the last decade, pulses have gained attention to produce ...bioactive hydrolysates and peptides. Common bean hydrolysates and peptides have been reported to perform mainly angiotensin I converting enzyme inhibition, antioxidant capacity, and antimicrobial and tumor cell inhibition activities. In this paper, we review the biological activities, the factors that can modify the effectiveness of the hydrolysates and peptides present in common bean, as well as the proposed mechanisms of action and the perspectives of the production of common bean protein hydrolysates to be used as a functional ingredient.
•Bioactive properties of common bean hydrolysates are discussed.•Diversity in parameter affecting bioactivity is observed.•Perspectives and opportunity areas are explained.
The common bean (
L.) is an important crop in the world that forms root nodules with diverse rhizobia. Aiming to learn the rhizobial communities associated with the common bean in the black soil of ...Northeast China, 79 rhizobia were isolated from root nodules of two host varieties (Cuican and Jiadouwang) grown in two sites of blackland and were characterized by comparative sequence analyses of 16S rRNA,
, and
genes, and whole genome. As a result,
, and
as minor groups and three dominant novel
species were identified based on their average nucleotide identity and DNA-DNA hybridization values to the type strains of relative species. This community composition of rhizobia associated with the common bean in the tested black soils was unique. Despite their different species affiliations, all of them were identified into the symbiovar phaseoli according to the phylogenies of symbiotic genes,
and
. While the phylogenetic discrepancies found in
evidenced that the evolutions of nodulation (
) and nitrogen fixation (
) genes were partially independent. In addition, only one dominant rhizobial species was shared by the two common bean varieties grown in the two soil samples, implying that both the plant variety and the soil characteristics affected the compatibility between rhizobia and their hosts. These findings further enlarged the spectrum of common bean-nodulating rhizobia and added more information about the interactions among the soil factors, rhizobial species, and host plants in the symbiosis.
•Nine orthologues of SMXL genes in common bean were identified.•The basic molecular properties of PvSMXLs were characterized, and cis-elements in their promoters were predicted.•The expression ...patterns of PvSMXL genes under PEG, Cu, and KAR1 treatments were analyzed.•PvSMXL2, which responds to PEG, Cu and KAR1 treatments, negatively regulates drought tolerance.
Common bean (Phaseolus vulgaris L.) is a major legume crop worldwide, but its growth and development frequently face challenges due to abiotic stresses, particularly drought. Proper supplement of copper could mitigate the adverse effects of drought, but excessive accumulation of this metal in plants can be harmful. The suppressor of MAX2 1-like (SMXL) gene family, which plays important roles in various plant processes, including stress responses, remains poorly understood in common bean. In this study, we identified nine orthologues of SMXL genes in common bean, which are located on six chromosomes and classified into four subgroups. Basic molecular properties, including theoretical isoelectric point (PI), molecular weight (MW), grand average of hydropathicity (GVIO), gene structure, and conserved motifs were characterized, and numerous cis-elements in promoters were predicted. The expression patterns of PvSMXL genes were found to be distinct under 10% polyethylene glycol (PEG)-induced drought stress and 200 μM Cu treatments. Most PvSMXLs showed reduced expression in response to Cu treatment, whereas nearly half PvSMXLs exhibited inducible expression under drought stress. PvSMXL2, which exhibited a rapid response to karrikin 1 (KAR1), an active form of the plant growth regulators newly found in the smoke of burning plant material, was down-regulated by both PEG-induced drought and Cu stresses. Transient silencing of PvSMXL2 resulted in enhanced drought stress tolerance without conferring Cu tolerance. These findings provide valuable insights into the functions of SMXL genes in common bean under abiotic stress conditions.
The nitrogen fixing ability of common bean (
Phaseolus vulgaris
L.) in association with rhizobia is often characterized as poor compared to other legumes, and nitrogen fertilizers are commonly used ...in bean production to achieve high yields, which in general inhibits nitrogen fixation. In addition, plants cannot take up all the nitrogen applied to the soil as a fertilizer leading to runoff and groundwater contamination. The overall objective of this work is to reduce use of nitrogen fertilizer in common bean production. This would be a major advance in profitability for the common bean industry in Canada and would significantly improve the ecological footprint of the crop. In the current work, 22 bean genotypes including recombinant inbred lines (RILs) from the Mist × Sanilac population and a non-nodulating mutant (R99) were screened for their capacity to fix atmospheric nitrogen under four nitrogen regimes. The genotypes were evaluated in replicated field trials on N-poor soils over three years for the percent nitrogen derived from atmosphere (%Ndfa), yield, and a number of yield-related traits. Bean genotypes differed for all analyzed traits, and the level of nitrogen significantly affected most of the traits, including %Ndfa and yield in all three years. In contrast, application of rhizobia significantly affected only few traits, and the effect was inconsistent among the years. Nitrogen application reduced symbiotic nitrogen fixation (SNF) to various degrees in different bean genotypes. This variation suggests that SNF in common bean can be improved through breeding and selection for the ability of bean genotypes to fix nitrogen in the presence of reduced fertilizer levels. Moreover, genotypes like RIL_38, RIL_119, and RIL_131, being both high yielding and good nitrogen fixers, have potential for simultaneous improvement of both traits. However, breeding advancement might be slow due to an inconsistent correlation between these traits.
•Seedling root architecture is related to yield in some environments.•Gene pools and races vary significantly for root architecture.•Integrated root phenotypes are related to yield in some ...environments.•Seedling root architectural phenes are a valuable breeding targets.
Seedling root phenotypes may have important impacts on fitness and are more easily measured than mature root phenotypes. We phenotyped the roots of 577 genotypes of common bean (Phaseolus vulgaris), representing the bulk of the genetic diversity for recent cultivars and landraces in this species. Root architectural phenotypes of seedlings germinated for nine days were compared to root architectural phenotypes in the field as well as seed yield across 51 environments with an array of abiotic stresses including drought, nutrient deficiency, and heat, as well as non-stress conditions. We observed repeatability ranging from 0.52–0.57 for measures of root phenotypes in seedlings, significant variation in root phene states between gene pools and races, relationships between seedling and field phenotypes, and varying correlations between seedling root phenes and seed yield under a variety of environmental conditions. Seed yield was significantly related to seedling basal root number in 22% of environments, seedling adventitious root abundance in 35% of environments, and seedling taproot length in 12% of environments. Cluster analysis grouped genotypes by their aggregated seedling root phenotype, and variation in seed yield among these clusters under non-stress, drought, and low fertility conditions was observed. These results highlight the existence and influence of integrated root phenotypes for adaptation to edaphic stress, and suggest root phenes have value as breeding targets under real-world conditions.
Climate change models predict more frequent incidents of heat stress worldwide. This trend will contribute to food insecurity, particularly for some of the most vulnerable regions, by limiting the ...productivity of crops. Despite its great importance, there is a limited understanding of the underlying mechanisms of variation in heat tolerance within plant species. Common bean, Phaseolus vulgaris, is relatively susceptible to heat stress, which is of concern given its critical role in global food security. Here, we evaluated three genotypes of P. vulgaris belonging to kidney market class under heat and control conditions. The Sacramento and NY-105 genotypes were previously reported to be heat tolerant, while Redhawk is heat susceptible.
We quantified several morpho-physiological traits for leaves and found that photosynthetic rate, stomatal conductance, and leaf area all increased under elevated temperatures. Leaf area expansion under heat stress was greatest for the most susceptible genotype, Redhawk. To understand gene regulatory responses among the genotypes, total RNA was extracted from the fourth trifoliate leaves for RNA-sequencing. Several genes involved in the protection of PSII (HSP21, ABA4, and LHCB4.3) exhibited increased expression under heat stress, indicating the importance of photoprotection of PSII. Furthermore, expression of the gene SUT2 was reduced in heat. SUT2 is involved in the phloem loading of sucrose and its distal translocation to sinks. We also detected an almost four-fold reduction in the concentration of free hexoses in heat-treated beans. This reduction was more drastic in the susceptible genotype.
Overall, our data suggests that while moderate heat stress does not negatively affect photosynthesis, it likely interrupts intricate source-sink relationships. These results collectively suggest a physiological mechanism for why pollen fertility and seed set are negatively impacted by elevated temperatures. Identifying the physiological and transcriptome dynamics of bean genotypes in response to heat stress will likely facilitate the development of varieties that can better tolerate a future of elevated temperatures.
Background: Common bean (Phaseolus vulgaris L.) is a globally important grain and vegetable legume crop, providing a substantial portion of the diet protein and minerals for many people in the ...developing world. However, the genetic studies and improvement on this crop has long been impeded by its recalcitrance to Agrobacterium-mediated whole plant genetic transformation. Established Agrobacterium rhizogenes-based hairy root transformation in common bean heavily relies on the strain K599.
Methods: In order to develop an efficient alternative protocol for hair transformation in common bean, the efficiency of Agrobacterium rhizogenes strain R1000 in inducing hairy roots from 6-day-old seedlings with root below cotyledons excised by the soaking and smearing method were tested. The binary plasmid pBI121 with the reporter gene GUS (pBI121-GUS) or eGFP (pBI121-eGFP) driven by the constitutive promoter was used for transformation and rapid identification of the transgenic hairy roots. Result: We established a strain R1000-based system for the induction of hairy roots in common bean. The plant receptor genotypes and infection methods were optimized, which led to a high transformation rate of hairy roots up to 60%. This method therefore provides a useful alternative means for functional genomic studies in common bean.
Service crops are grown to provide ecosystem services, such as the ability to increase soil organic matter and fertility. Also, they reduce erosion processes, weed control, disease regulation, water ...purification, soil biodiversity, and physical restoration. The physical arrangement of elemental particles in soil aggregates controls many ecosystem functions such as soil stability and carbon sequestration. This study aimed to analyze the short-term effect of including different service crops on the soil aggregate dynamics in a degraded common bean monoculture system and how it influences the rhizospheric microbial activity, carbon, and nitrogen microbial biomass. Here, we measured soil water-stable aggregates, particulate and associated organic carbon, soil microbial biomass, microbial activity, service crop aerial biomass, and cash crop yield in bulk soils during the 2020/2021 and 2021/2022 agricultural cycles. Soil samples from depths of 0–10 cm from five management treatments (annual service crop/common bean) were analyzed under no-tillage: 1) Oat (O) = Avena sativa/common bean; 2) Wheat (W) = Triticale/common bean; 3) Vetch (V) = Vicia villosa/common bean; 4) Melilotus (Me) = Melilotus alba/common bean; 5) common bean monoculture (M) = common bean without service crop. Additionally, two controls were analyzed: 6) Brachiaria perennial (BP) = Brachiaria brizantha perennial; 7) Native vegetation (NV). Service crops significantly increased aggregate stability, mean weight diameter, particulate matter and associated organic carbon, promoting the formation of large macroaggregates (0.25–2 mm and > 2 mm). This led to an increase in carbon stocks. Microbial activity expressed as hydrolysis of fluorescein diacetate and acid phosphatase activity, increased in the largest fraction for all service crops. Vicia improved surface residues; on average all service crops increased the common bean yield by 107.25 %. In summary, Vicia represents the best alternative as a service crop to improve the quality and health of degraded monoculture soils.
•Service crops improve the formation of large macroaggregates (0-25 mm - < 2 mm).•Legumes increased the organic particulate carbon content in relation to grasses.•Service crops, especially oat and wheat, increased microbial biomass carbon in macroaggregates.•Service crops, especially vicia, increased surface residues, and improved cash crop yield.•As a restoration control, Brachiaria perennial increased aggregate stability and mean weight diameter.
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