Embrapa Semiarid


Embrapa Semiarid

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Leite J.,Federal Rural University of Rio de Janeiro | Leite J.,Federal University of Alagoas | Fischer D.,Embrapa Agrobiologi | Fischer D.,Helmholtz Center Munich | And 8 more authors.
Frontiers in Plant Science | Year: 2017

Many studies have been pointing to a high diversity of bacteria associated to legume root nodules. Even though most of these bacteria do not form nodules with legumes themselves, it was shown that they might enter infection threads when co-inoculated with rhizobial strains. The aim of this work was to describe the diversity of bacterial communities associated with cowpea (Vigna unguiculata L. Walp) root nodules using 16S rRNA gene amplicon sequencing, regarding the factors plant genotype and soil type. As expected, Bradyrhizobium was the most abundant genus of the detected genera. Furthermore, we found a high bacterial diversity associated to cowpea nodules; OTUs related to the genera Enterobacter, Chryseobacterium, Sphingobacterium, and unclassified Enterobacteriacea were the most abundant. The presence of these groups was significantly influenced by the soil type and, to a lesser extent, plant genotype. Interestingly, OTUs assigned to Chryseobacterium were highly abundant, particularly in samples obtained from an Ultisol soil. We confirmed their presence in root nodules and assessed their diversity using a target isolation approach. Though their functional role still needs to be addressed, we postulate that Chryseobacterium strains might help cowpea plant to cope with salt stress in semi-arid regions. © 2017 Leite, Fischer, Rouws, Fernandes-Júnior, Hofmann, Kublik, Schloter, Xavier and Radl.

de Faria L.C.,Embrapa Rice and Beans | Melo P.G.S.,Federal University of Goais | Pereira H.S.,Embrapa Rice and Beans | Wendland A.,Embrapa Rice and Beans | And 5 more authors.
Euphytica | Year: 2014

The common bean breeding program coordinated by Embrapa Arroz e Feijão released 50 new cultivars from 1984 to 2010. The aim of the present study was to estimate genetic progress in terms of seed yield and other agronomic traits achieved by the black-type common bean breeding program in Brazil over the 22-year period from 1985 to 2006. Two types of field experiments were performed to assess genetic progress. In regard to experiments on lines, the three best breeding lines from each of 11 evaluation cycles constituted 33 treatments. These evaluations were made in 20 environments and served to estimate progress in seed yield and seed size because these were the criteria applied in selecting the elite lines. Cultivar evaluations included nine cultivars recommended by Embrapa during the period under investigation, and the evaluations were established in 21 environments. These evaluations served to estimate improvements in reaction to angular leaf spot, plant architecture and tolerance to lodging because cultivars usually exhibit superior phenotypes for such characteristics. Evaluations were performed from 2008 to 2010. Estimated improvement in seed yield was 25.2 kg ha−1 or 1.1 % per year. Improvements were also found in tolerance to lodging (1.7 % per year) and 100-seed weight (0.65 % per year). There was no significant progress for the plant architecture and resistance to angular leaf spot traits. © 2014, Springer Science+Business Media Dordrecht.

Passos O.S.,Embrapa Cassava and Fruits | Bastos D.C.,Embrapa Semiarid | Soares W.D.S.,Embrapa Cassava and Fruits | Girardi E.A.,Embrapa Cassava and Fruits | De Leao H.C.,Fischer S.A. Com. Ind. E Agricultura
Acta Horticulturae | Year: 2015

The citrus industry is one of the most relevant segments of the Brazilian agribusiness, being responsible for 40% of the sweet orange production and 60% of the juice processing in the World. Some factors for this hegemony are the adequate ecological conditions, which allows for cultivation without irrigation, and huge land availability. Threats, however, exist especially at the core of national production, in the State of São Paulo. The most important, bacterial and virus diseases, appear with increasingly incidence and destructive power. The Northeast Region, the second national producing region, apparently presents the best conditions for the citrus industry expansion. Among potential areas, the São Francisco Valley appears as one the best options due to the semiarid climate, governmental support and tradition in the irrigated fruit production and export. The region, with 360,000 ha potentially irrigable, is located between 8 and 9° S and 40 and 42° W and altitude of 300 m a.s.l. The annual rainfall is less than 600 mm and the average temperature is 26.2° C, relative humidity of 67% and solar radiation of 3,000 h/year, constituting a comparative advantage to species such as acid lime, lemon and grapefruit. Citrus scions and rootstocks trials have been carried out since the 1990s by Embrapa in cooperation with the private sector in the States of Bahia and Pernambuco, which results are presented in this paper, showing the potentiality of the São Francisco Valley as a new belt for the Brazilian citrus industry.

De Carvalho L.M.J.,Laboratorio Of Tecnologia E Analise Instrumental Of Alimentos Lataia | De Carvalho J.L.V.,Laboratorio Of Tecnologia E Analise Instrumental Of Alimentos Lataia | Faustino R.M.E.B.,Embrapa Food Technology | Kaser I.M.,Embrapa Food Technology | And 2 more authors.
Chemical Engineering Transactions | Year: 2015

Nowadays, the Vitamin A deficiency (VAD) is still a public health concern, being one of the most important components of the high rate of morbidity and mortality among children in developing countries. There is a high prevalence of night blindness caused by deficiency of Vitamin A. Children and pregnant women are particularly affected. Many pumpkins (C. moschata) genotypes present a great variability of carotenoid content mainly the beta-carotene. The objective of this work is to evaluate the variability of beta-carotene among pumpkins genotypes. Twenty biofortified pumpkins cultivated at Embrapa Table Coastland and Semiarid were evaluated regarding beta-carotene contents.The analyses were carried out by High Performance Liquid Chromatography. The pumkinks showed a large variability in the contents of total carotenoids varying, in fresh pumpkins from 699.06 (genotype 25) to 124.60 g/g (genotype 26), from 106.96 (genotype 26) to 655.54 g/g (genotype 25) in samples cooked in boiling water and 117.55 (genotype 19) and 650.54 g/g (genotype 25) in steamed cooked, respectively. Copyright © 2015, AIDIC ServiziS.r.l.

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