Effect of pH and soybean cultivars on the quantitative analyses of soybean rhizobia populations

Yang, Shaochen

doi:10.1016/s0168-1656(01)00340-6

Cited by 52 publications

(43 citation statements)

References 22 publications

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“…Furthermore, the effects of soil pH on the interaction between rhizobia and their legume hosts have been demonstrated (Yang et al, 2001), as have the effects of abiotic stress on the expression of nod genes (Duzan et al, 2004). Our results further confirmed the diversity of rhizobial populations or communities in a distinctive geographic region, suggesting that the symbiotic association between legumes and rhizobia is a result of interactions among rhizobia, legumes, and biogeographic and environmental factors.…”

Section: Discussionsupporting

confidence: 77%

Genetic diversity and phylogeny of rhizobia isolated from Caragana microphylla growing in desert soil in Ningxia, China

Dai

Liu²,

Wang³

2012

Genet. Mol. Res.

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Section: Discussionsupporting

confidence: 77%

Genetic diversity and phylogeny of rhizobia isolated from Caragana microphylla growing in desert soil in Ningxia, China

Dai

Liu²,

Wang³

2012

Genet. Mol. Res.

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“…To date, rhizobia nodulating with soybean in Xinjiang (a geographically isolated region surrounded by deserts and high mountains) and in subtropical and tropic regions of China have been systematically studied (4,5,10,23,47,48), and diverse soybean rhizobia belonging to Bradyrhizobium, Mesorhizobium, and Sinorhizobium have been reported in these studies (4,5,10,23,47,48). In addition, biogeographic patterns have been observed in the soybean rhizobia (10,20,23).…”

mentioning

confidence: 99%

Biodiversity and Biogeography of Rhizobia Associated with Soybean Plants Grown in the North China Plain

Zhang

Liu

Chen

et al. 2011

Appl Environ Microbiol

148

101

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As the putative center of origin for soybean and the second largest region of soybean production in China, the North China Plain covers temperate and subtropical regions with diverse soil characteristics. However, the soybean rhizobia in this plain have not been sufficiently studied. To investigate the biodiversity and biogeography of soybean rhizobia in this plain, a total of 309 isolates of symbiotic bacteria from the soybean nodules collected from 16 sampling sites were studied by molecular characterization. These isolates were classified into 10 genospecies belonging to the genera Sinorhizobium and Bradyrhizobium, including four novel groups, with S. fredii (68.28%) as the dominant group. The phylogeny of symbiotic genes nodC and nifH defined four lineages among the isolates associated with Sinorhizobium fredii, Bradyrhizobium elkanii, B. japonicum, and B. yuanmingense, demonstrating the different origins of symbiotic genes and their coevolution with the chromosome. The possible lateral transfer of symbiotic genes was detected in several cases. The association between soil factors (available N, P, and K and pH) and the distribution of genospecies suggest clear biogeographic patterns: Sinorhizobium spp. were superdominant in sampling sites with alkaline-saline soils, while Bradyrhizobium spp. were more abundant in neutral soils. This study clarified the biodiversity and biogeography of soybean rhizobia in the North China Plain.

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“…These first soybean isolates are able to form nitrogen-fixing nodules on Asiatic soybean cultivars (such as cultivar Peking) but either fail to nodulate or are very poorly effective with the modern cultivars from North America (Keyser et al, 1982;Buendía-Clavería and Ruiz-Sainz, 1985;Buendía-Clavería et al, 1989). Later, new S. fredii strains, which are able to form nitrogen-fixing nodules with both Asiatic and American soybean cultivars, were isolated (Dowdle and Bohlool, 1985;Yang et al, 2001;Camacho et al, 2002). In addition to their marked soybean cultivar specificity, S. fredii strains show a very broad host range, being able to nodulate at least 79 different genera of legumes (Pueppke and Broughton, 1999).…”

Section: Diversity Of Soybean-nodulating Rhizobia In Chinamentioning

confidence: 99%

“…In addition to their marked soybean cultivar specificity, S. fredii strains show a very broad host range, being able to nodulate at least 79 different genera of legumes (Pueppke and Broughton, 1999). Most of the well-studied strains of S. fredii are from China (Keyser et al, 1982;Dowdle and Bohlool, 1985;Yang et al, 2001;Camacho et al, 2002;Rodríguez-Navarro et al, 2002), although fast-growing soybean microsymbionts have also been isolated from Malasia (Young et al, 1988), Vietnam (Cleyet-Marel, 1987 and Panama (Henández and Focht, 1984). Taxonomic studies have shown that S. fredii is closely related to the alfalfa microsymbiont, Sinorhizobium meliloti (de Lajudie et al, 1994), although both their host ranges and nodulation-factor structures (Nod factors or LCOs) are different (Dénarié et al, 1996;Gil-Serrano et al, 1997).…”

Section: Diversity Of Soybean-nodulating Rhizobia In Chinamentioning

confidence: 99%

“…To reduce this gap in information was one of the main objectives of a project, which was funded by the European Union (1997)(1998)(1999)(2000) and involved research institutions from China, Great Britain, the Netherlands, and Spain. In this project, indigenous fast-and slow-growing soybean rhizobia populations (most probably Bradyrhizobium japonicum and Sinorhizobium fredii, respectively) in soil samples from Shandong, Henan, Hubei, and Xinjiang autonomous regions were quantitatively analysed using the Most Probable Number (MPN) technique (Yang et al, 2001). Different Asiatic and American soybean cultivars were used as the trapping host.…”

Section: Studies Of the Natural Soybean-rhizobia Populations In Chinementioning

confidence: 99%

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Soybean Cultivation and BBF in China

Sainz

Junchu

Rodríguez-Navarro³

et al.

Nitrogen Fixation in Agriculture, Forestry, Ecology, and the Environment

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China is the geographical origin of cultured soybeans and is where they have been cultivated for more than 5,000 years. Soybean is grown in nearly all provinces of China, the exceptions being Qinghai and the Tibetan Plateau. Based on climatic differences, China can be divided into five main geographical regions as regards soybean cultivation. As a complementary classification, Chinese soybean varieties have also been classified according to the sowing date; they were divided into winter-, spring-, summer-, and autumn-sowing varieties. In spite of the soybean acreage in China (9.4 million ha in 2001), which ranks fourth in the world, China has also become the largest soybean importer in the world. Although China has greatly improved soybean productivity in the last 20 years, its total production (or average seed yield) is still clearly lower than that reached in western countries. The symbiotic interaction, which soybean forms with different rhizobia, is a key factor in increasing soybean productivity in China within the context of agricultural sustainability. Research efforts in China have mainly concentrated on the identification and characterisation of biological material, both soybean accessions and rhizobial strains that effectively nodulate soybeans. As a result of this activity, a large collection of soybean germplasm is available and the existence of a broad spectrum of bacteria that nodulate soybeans (which we will collectively call "soybean-rhizobia") has been demonstrated.However, although soybean

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Effect of pH and soybean cultivars on the quantitative analyses of soybean rhizobia populations

Cited by 52 publications

References 22 publications

Genetic diversity and phylogeny of rhizobia isolated from Caragana microphylla growing in desert soil in Ningxia, China

Genetic diversity and phylogeny of rhizobia isolated from Caragana microphylla growing in desert soil in Ningxia, China

Biodiversity and Biogeography of Rhizobia Associated with Soybean Plants Grown in the North China Plain

Soybean Cultivation and BBF in China

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