Soils and Rice-Fields

Whitton, Brian A.

doi:10.1007/0-306-46855-7_8

Cited by 50 publications

(38 citation statements)

References 130 publications

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“…Furthermore, they are known as primary colonizers of recently deglaciated soil [24,46]. Nevertheless, while Cyanobacteria are well studied in aquatic and symbiotic systems [9,71], very little is known about cyanobacteria under the soil surface [84]. The cyanobacterial community found in the glacier forefield was very similar to that found in mature biological soil crusts (BSCs) from the Colorado plateau and Chihuahuan desert [86], but crust formation was not evident at the sampling sites.…”

Section: Closest Cultivated Relatives Librariesmentioning

confidence: 99%

High Diversity of Diazotrophs in the Forefield of a Receding Alpine Glacier

et al. 2008

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Forefields of receding glaciers are unique and sensitive environments representing natural chronosequences. In such habitats, microbial nitrogen fixation is of particular interest since the low concentration of bioavailable nitrogen is one of the key limitations for growth of plants and soil microorganisms. Asymbiotic nitrogen fixation in the Damma glacier (Swiss Central Alps) forefield soils was assessed using the acetylene reduction assay. Free-living diazotrophic diversity and population structure were resolved by assembling four NifH sequence libraries for bulk and rhizosphere soils at two soil age classes (8-and 70-year ice-free forefield). A total of 318 NifH sequences were analyzed and grouped into 45 unique phylotypes.Phylogenetic analyses revealed a higher diversity as well as a broader distribution of NifH sequences among phylogenetic clusters than formerly observed in other environments. This illustrates the importance of free-living diazotrophs and their potential contribution to the global nitrogen input in this nutrient-poor environment. NifH diversity in bulk soils was higher than in rhizosphere soils. Moreover, the four libraries displayed low similarity values. This indicated that both soil age and the presence of pioneer plants influence diversification and population structure of free-living diazotrophs.

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Section: Closest Cultivated Relatives Librariesmentioning

confidence: 99%

High Diversity of Diazotrophs in the Forefield of a Receding Alpine Glacier

et al. 2008

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“…A nitrogen accretion of [25][26][27][28][29][30] kg N/ha has been attributed to the activities of these ubiquitous organisms and correlated with the abundance of heterocystous forms as fl oating assemblages [1][2][3]. However, in recent years, an urgent need has felt to address inherent problems, which have limited their extensive exploitation, especially their poor establishment in diverse rice ecologies and soil types.…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial diversity in the rhizosphere of rice and its ecological significance

et al. 2009

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This investigation was undertaken to characterize the abundance and genera-wise diversity of cyanobacteria in the rice rhizosphere and nitrogen-fi xing ability of the isolated strains. The cyanobacterial strains belonging to the genera Nostoc and Anabaena comprised 80% of the rhizosphere isolates, which were also effi cient in enhancing the germination and growth of wheat seeds and exhibited signifi cantly high protein accumulation and IAA production. Distinct profi les for the cyanobacterial strains were obtained on amplifi cation with extended Hip 1 primer -HipTG, indicative of the diversity among these strains. Our investigation helped in identifying promising cyanobacterial isolates from the rhizosphere of rice, which can be utilized in developing effi cient plant growth promoting cyanobacterial inoculants.

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“…Species of Nostoc, Anabaena, Tolypothrix, Aulosira, Cylindrospermum, Scytonema, Westiellopsis and several other genera are widespread in Indian rice field soils and are known to contribute significantly to their fertility [29,9'15]. There are very few reports on the existence of cyanobacteria at low pH (acidic range) as they are in general, intolerant to low pH conditions [1,8,5] Among the diverse habitats, rice fields constitute one of the favourable ecologies for the growth and proliferation of cyanobacteria [30,26,14]. In the 1970s, algalization or the enrichment of soil via inoculation of selected cyanobacterial strains led to the promotion of these biofertilisers among the farming community in South East Asia [26,28].…”

Section: Introductionmentioning

confidence: 99%

Soil Ph and Its Role in Cyanobacterial Abundance and Diversity in Rice Field Soils

Prasanna¹

2007

Appl Ecol Env Res

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Nayak -Prasanna: Soil pH and its role in cyanobacterial abundance and diversity in rice field soils - Abstract. The influence of soil pH was evaluated on the abundance and generic diversity of cyanobacteria in soil samples collected from diverse rice soil ecologies of India. Qualitative and quantitative studies of the 52 soil samples collected from nine agroecologies was carried out using enrichment, MPN (Most Probable Number) techniques and diversity indices were measured. A total of 166 forms, including 130 heterocystous and 36 non-heterocystous isolates were isolated and the highest percentage of abundance of heterocystous forms was observed at pH of 8.1. Highest Shannon's diversity index was recorded at a pH of 6.9, followed by pH of 7.4, while indices of richness and evenness (J and E) were highest in soil samples of pH of 9.3. This study highlighted the successful colonization of cyanobacteria in rice field soils of diverse pH and the need for enrichment of the native flora as a means of exploiting the full potential of cyanobacterial biofertilizers in agriculture

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Soils and Rice-Fields

Cited by 50 publications

References 130 publications

High Diversity of Diazotrophs in the Forefield of a Receding Alpine Glacier

High Diversity of Diazotrophs in the Forefield of a Receding Alpine Glacier

Cyanobacterial diversity in the rhizosphere of rice and its ecological significance

Soil Ph and Its Role in Cyanobacterial Abundance and Diversity in Rice Field Soils

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