Mitigation of Abiotic Stress in Legume-Nodulating Rhizobia for Sustainable Crop Production

Dahiya, Anupma; Gera, Rajesh; Sindhu, S. S.

doi:10.1007/s40003-020-00474-3

Cited by 27 publications

(9 citation statements)

References 127 publications

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“…This could be associated with the unexpected low rainfall received in these region during the second season. Moisture stress and drought has been reported to limit nodule formation, subsequently limiting N fixation (Sindhu et al, 2020). This has been linked to increased acid phosphatases and antioxidant activity in the root nodules during drought conditions (Mouradi et al, 2018).…”

Section: Effectiveness Of Rhizobia In Field Conditionsmentioning

confidence: 99%

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Nyaga

Njeru

2020

Front. Agron.

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Cowpea [Vigna unguiculata (L.) Walp] is an important crop for smallholder farmers in the marginal areas of sub-Saharan Africa. However, the crop growth and production are affected by low soil fertility due to poor soil management practices. Here, we assessed the effect of native and commercially available rhizobia inoculants on cowpea nodulation, growth, and yields on three local cowpea genotypes (K-80, M-66, and KVU 27-1) in the semiarid areas of Kenya. Field experiments were set in smallholder farms during the 2019 and 2020 cropping seasons. Native rhizobia were isolated from root nodules of cowpea plants used as trap cultures. The isolates were further assessed for symbiotic efficiency (SE) in the greenhouse and field experiments carried out during the short and long rain seasons. Field experiments were laid out in a randomized complete block design with three replications. The treatments consisted of the commercial inoculant (Biofix), native isolates, native + Biofix (consortium), and an uninoculated control. In the greenhouse, the native isolates significantly increased nodule number and dry weight (DW), shoot DW, and root DW when compared to the uninoculated control. Additionally, 50% of the isolates recorded SE of >80%, while 35.7 and 14.3% of the isolates had SE of 51–80 and <50%, respectively. In the field, rhizobia inoculation significantly (P < 0.05) increased nodulation and shoot DW compared to the uninoculated controls. Remarkably, rhizobia inoculation significantly increased yields where inoculation with native isolates recorded 22.7% increase in yield when compared to uninoculated control in the first season and 28.6% increase in yield in the second season. However, the rhizobia inoculants did not show a preference for any of the cowpea genotypes, and their performance was influenced by season and the study location. Our results demonstrate the existence of superior native isolates with potential to be developed to low-cost biofertilizer for sustainable cowpea production.

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Section: Effectiveness Of Rhizobia In Field Conditionsmentioning

confidence: 99%

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Nyaga

Njeru

2020

Front. Agron.

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“…In spite of that, our results showed that an increase in carbohydrates and protein concentrations in cowpea seeds treated with bacterial inoculation under both of normal and saline irrigation water compared to control. Therefore, beneficial microorganisms can be fixes N 2 , produce phytohormones (IAA and GA) and enhanced the roots to uptake the different nutrients which led to performed and produce carbohydrates and proteins in legumes seeds (Dahmardeh et al 2009 andSindhu et al 2020). These results are similar to cowpea plants (Musa et al 2011), syrian cephalaria plants (Rahimi et al 2019), mung bean, cowpea, and soybean (Htwe et al 2019), and common bean, pea, cowpea and fenugreek plants (El-Batanony et al 2020)…”

Section: Total Carbohydrate and Protein Contentmentioning

confidence: 92%

Impact of bio-inoculation with Bradyrhizobium spp. on yield and Seed quality of forage cowpea (Vigna unguiculata L.) under soil salinity conditions

El-Gaafarey

El-Nahrawy

2020

EBSS

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A STUDY was carried out to assess the effect of single and/or combined inoculation with Bradyrhizobium spp. isolates on seed yield and quality of forage cowpea (Vigna unguiculata cv. Baladi) under salinity-affected soil conditions. The experiment was conducted in a split plot design for two growing seasons, 2018 and 2019, with two main plot treatments of irrigation water (normal and saline) and four sub-plot inoculation treatments. Results revealed that sub-main plot treatments differed significantly for number of branches, number of pods, pod length, number of seeds pod-1 , pod weight plot-1 (Kg) and seed yield (Kg fed-1) of forage cowpea plants as affected by the type of irrigation water in the two growing seasons. Also, combination treatment (Bradyrhizobium SARS-Rh3 and Bradyrhizobium SARS-Rh5) significantly minimized the negative effects of saline irrigation water treatment for seed content of elements (N, P, K, Zn, Mn, Fe and Cu). In the same context, inoculation treatments followed the descending order of SARS-Rh3 + SARS-Rh5>SARS-Rh5>SARS-Rh3 > control for total carbohydrate and protein % of cowpea seeds during 2018 and 2019 seasons. For assessment of seed quality viz., seed germination (%), seedling length (cm), seedling weight (g), vigour index I and vigour index II were higher in 2019 than 2018 season. Similar finding was observed in economic evaluation for SARS-Rh3+SARS-Rh5 treatment which enhanced profitability of cowpea during the two growing seasons.

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“…Crop production in rain-fed smallholder agroecosystems is mainly limited by various abiotic stresses that interfere with the genetic regulation of key cellular pathways in plants and severely affect the plant's physiological functioning and morphology (Sindhu et al, 2020). High temperatures, water stress, salinity, and floods are some of the important abiotic plant stressors experienced by smallholder farmers in SSA and may cause up to 70% of crop yield losses (Bationo et al, 2012).…”

Section: Pgpms In Enhancing the Adaptation Of Crops To Abiotic Stressesmentioning

confidence: 99%

“…High soil salinity, caused by excessive water evaporation and accumulation of chloride salts such as NaCl and MgCl 2 , negatively affect soil microbial biomass, seed germination, and plant development via osmotic potential or ion-specific damage mechanisms (Sindhu et al, 2020). In Uganda, smallholder farmers use Symbion vam plus R biofertilizer produced by T. Stanes and Company Ltd, and contains Bacillus megaterium, Glomus spp., and Gigaspora spp.…”

Section: Pgpms In Enhancing the Adaptation Of Crops To Abiotic Stressesmentioning

confidence: 99%

“…Some PGPM inoculants can confer resilience against such harsh local environmental conditions (Agami et al, 2016). This explains why microbial inoculants are recommended even in soils with less water and where most nutrients are immobile (Sindhu et al, 2020). In some instances, seed companies and researchers have solved this challenge by producing crop cultivars that customarily favor colonization of specific PGPMs under a wide range of soil conditions (Faye et al, 2020).…”

Section: Development Of Microbial Inocula For Smallholder Farmersmentioning

confidence: 99%

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Potential Use of Beneficial Microorganisms for Soil Amelioration, Phytopathogen Biocontrol, and Sustainable Crop Production in Smallholder Agroecosystems

Koskey¹,

Mburu²,

Awino³

et al. 2021

Front. Sustain. Food Syst.

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Smallholder agroecosystems play a key role in the world's food security providing more than 50% of the food produced globally. These unique agroecosystems face a myriad of challenges and remain largely unsupported, yet they are thought to be a critical resource for feeding the projected increasing human population in the coming years. The new challenge to increase food production through agricultural intensification in shrinking per capita arable lands, dwindling world economies, and unpredictable climate change, has led to over-dependence on agrochemical inputs that are often costly and hazardous to both human and animal health and the environment. To ensure healthy crop production approaches, the search for alternative ecofriendly strategies that best fit to the smallholder systems have been proposed. The most common and widely accepted solution that has gained a lot of interest among researchers and smallholder farmers is the use of biological agents; mainly plant growth promoting microorganisms (PGPMs) that provide essential agroecosystem services within a holistic vision of enhancing farm productivity and environmental protection. PGPMs play critical roles in agroecological cycles fundamental for soil nutrient amelioration, crop nutrient improvement, plant tolerance to biotic and abiotic stresses, biocontrol of pests and diseases, and water uptake. This review explores different research strategies involving the use of beneficial microorganisms, within the unique context of smallholder agroecosystems, to promote sustainable maintenance of plant and soil health and enhance agroecosystem resilience against unpredictable climatic perturbations.

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Mitigation of Abiotic Stress in Legume-Nodulating Rhizobia for Sustainable Crop Production

Cited by 27 publications

References 127 publications

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Potential of Native Rhizobia to Improve Cowpea Growth and Production in Semiarid Regions of Kenya

Impact of bio-inoculation with Bradyrhizobium spp. on yield and Seed quality of forage cowpea (Vigna unguiculata L.) under soil salinity conditions

Potential Use of Beneficial Microorganisms for Soil Amelioration, Phytopathogen Biocontrol, and Sustainable Crop Production in Smallholder Agroecosystems

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