Amplitude no fósforo microbiano em um Argissolo em pastagem nativa submetida à roçada e à introdução de espécies forrageiras com fertilização fosfatada em diferentes épocas

In the present study, we analyze the genetic structure and diversity among accessions of popcorn obtained from the CIMMYT International Maize and Wheat Improvement Center that represent the diversity available for current use by breeding programs. The main objectives were to identify SSR loci that were the best indicators of genetic diversity, to measure the genetic diversity within popcorn genotypes, and to analyze the genetic structure of the promising populations destined for use in breeding programs. The mean gene diversity of all SSR loci was 0.6352. An extremely high population differentiation level was detected (F(st) = 0.3152) with F(st) for each locus ranging from 0.1125 (Umc1229) to 0.4870 (Umc1755). Analyzing the genetic structure of eight popcorn accessions was especially important for identifying both SSR loci with high levels of heterozygosity and genotypes showing high heterozygosity (BOYA462 and ARZM13 050). This analysis should be the medium and long-term selection goal for the generation of inbred lines and the future production of new cultivars. Plant accessions ARZM05 083, ARZM13 050, and URUG298 may also be useful varieties that exhibit important agronomic characteristics that can be used through crosses to broaden the genetic basis of popcorn.

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A Collection of Popcorn as a Reservoir of Genes for the Generation of Lineages

Carvalho

Mangolin

Scapim

et al. 2012

Mol Biotechnol

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Phosphorus Desorption from Fe and Al Oxides Mediated by Soil Microorganisms

Araújo

Sampaio

Araújo

2015

Communications in Soil Science and Plant Analysis

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The capacity of soil microorganisms to desorb phosphorus (P) adsorbed to iron (Fe) and aluminum (Al) oxides was determined by impregnating paper strips with these oxides, adding P in quantities equivalent to the null points, and incubating the strips in Argisol and Latosol samples receiving increasing doses of glucose (0 to 10 mg g soil −1 ). Glucose stimulated microbial activity and at the end of the incubation period 69 and 41 percent of the added carbon (C) had been released as carbon dioxide (CO 2 ) in the Argisol and Latosol. This stimulated activity resulted in increasing P desorption, reaching 66 and 67 percent of the adsorbed P in the Fe strips and 49 and 80 percent in the Al strips for the Argisol and Latosol, respectively. Therefore, microorganisms can desorb P adsorbed to Fe and Al oxides when stimulated by an easily assimilated C source. Fe-and Al-oxide-impregnated paper strips technique provided an adequate method to measure soil P desorption, as mediated by microorganisms.

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Amplitude no fósforo microbiano em um Argissolo em pastagem nativa submetida à roçada e à introdução de espécies forrageiras com fertilização fosfatada em diferentes épocas

Cited by 2 publications

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A Collection of Popcorn as a Reservoir of Genes for the Generation of Lineages

A Collection of Popcorn as a Reservoir of Genes for the Generation of Lineages

Phosphorus Desorption from Fe and Al Oxides Mediated by Soil Microorganisms

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