Agronomic performance of onion hybrids in Baraúna, in the semi-arid region of Brazil

Nunes, Renato Leandro Costa; Oliveira, Alexandre Bosco de; Dutra, Alek Sandro

doi:10.1590/s1806-66902014000300023

Cited by 21 publications

(13 citation statements)

References 10 publications

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“…The country accounts for almost 2 and 40% of the world's and South America's production, respectively, being the 11th largest producer in the world (FAOSTAT, 2017). Despite the high yield, uniformity, and earliness of the hybrids, the use of open-pollinated (OP) populations is significant in some regions, such as in the Northeast region (Nunes et al, 2014). For Santos et al (2012), the use of OPs is due to the high cost of hybrid seeds, while Nunes et al (2014) attributed it to the poor dissemination of the agronomic performance of hybrids.…”

Section: Introductionmentioning

confidence: 99%

Fertility restoration locus and cytoplasm types in onion

Ferreira¹,

Santos²,

Oliveira³

2017

gmr

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The objective of this study was the identification of the cytoplasmic types and the genotyping for the fertility restoration nuclear locus (Ms) in 59 onion accessions, aiming at the selection of 'A' and 'B' lines essential for the obtainment of hybrids. Three markers were used to identify the cytoplasm 5' cob, orfA501, and orf725, and two were used for the Ms locus (AcSKP1 and AcPMS1). The two types of male-sterile cytoplasm ('S' and 'T'), as well as fertile cytoplasm ('N'), and the Ms and ms alleles in both homozygosity and heterozygosity were detected in the 59 genotypes evaluated in the experiment. The frequencies of the 5' cob/orfA501 and orf725 markers, as well as of the markers AcSKP1 and AcPMS1, were close in the onion accessions evaluated in this study. In the Brazilian germplasm, the frequencies of the 'N', 'S', and 'T' cytoplasm were approximately 0.47, 0.28, and 0.25, respectively, whereas the allele frequencies of Ms and ms were 0.52 and 0.48, respectively. The accessions Régia, EHCEB 20146, EHCEB 201427, Alvorada, Serrana, Crioula Mercosul, EHCEB 20142, BRS 367, Rainha, Juporanga, and Alfa SF C-XI have potential for the identification of 'A' and 'B' lines, since they presented mixtures of cytoplasm and different allele frequencies for Ms. All the plants of the accessions EHCEB 20142040/EHCEB 20141040, EHCEB 20142028/EHCEB 20141028, and EHCEB 20112006/EHCEB 20111006 were in the Nmsms and Smsms conditions, and have the potential for 'B' and 'A' lines, respectively, for the CMS-S system. All the plants of the accessions EHCEB 20142027/EHCEB 20141027, EHCEB 20102019/EHCEB 20101019, and Alfa SF 'B'/Alfa SF 'A' were in Nmsms and Tmsms conditions, and have the potential for 'B' and 'A' lines, respectively, for the CMS-T system.

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Section: Introductionmentioning

confidence: 99%

Fertility restoration locus and cytoplasm types in onion

Ferreira¹,

Santos²,

Oliveira³

2017

gmr

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“…Main reason for low productivity is the use of open-pollinated varieties (OPVs) or locally produced seeds by farmers with no quality control over its production. Research studies have proven that hybrids display higher heterosis than OPVs and are more uniform in their morphological and other horticultural traits (Netrapal and Singh 1999, Singh and Bhonde 2011, Nunes et al 2014 Hence, productivity of Indian onions can also be increased by developing hybrids for which stable male-sterile and maintainer lines are a prerequisite. In India, more than 50 commercial open-pollinated varieties suited to different zones of India have been released through research centres and State Agricultural Universities.…”

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Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

Khar

Saini

2016

Plant Breeding

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The main aim of this study was to validate PCR markers for determining cytoplasm and genotypes at the Ms locus in short-day onion. Three cytoplasmic (OSN, MKFR and accD) and four nuclear (OPT, jnurf13, AcSKP1 and AcPMS1) markers were employed. Sel. 121-1 had 100% S cytoplasm, whereas Sel. 121-2, 'Pusa Red' and 'Pusa Madhavi' had 88%, 33% and 17% S cytoplasm, respectively. 'Early Grano' and 'Pusa Riddhi' did not possess S cytoplasm. Observations in 33 commercial varieties revealed two with sterile (S) cytoplasm. Nuclear markers were not found in linkage disequilibrium with the Ms locus, and the constitution of Ms alleles by OPT was different from other three markers, which were in conformity with each other. The other three markers predicted that most of the plants should be homozygous recessive. Anther colour also did not confirm the sterility status. It can be concluded that accD may be used for cytoplasm determination based on the ease of its use. For the Ms locus tagging, more markers are needed to be evaluated to isolate maintainer lines from open-pollinated populations.

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“…Water deficit plays a fundamental role, especially in arid and semi-arid regions (), since it negatively affects germination, the stand of plants and vegetative development (Oliveira & Gomes-Filho, 2009;Nunes et al, 2014). In addition, this type of abiotic stress is capable of increasing competition between weeds and crops (Souza et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Recovery and germinative response of Amaranthus deflexus L. seeds under different levels of water stress and luminosities

et al. 2019

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Article AbstractThe objective of this work was to evaluate, in two experiments, the effect of water stress and luminosity on the germinative behavior and vigor of Amaranthus deflexus L seeds. The seeds were sown in Petri dishes containing two sheets of filter paper moistened with distilled water, in the control treatment. Using this treatment-control configuration, as a standard of comparison, two assays were performed using subsamples from the same A. deflexus seed population. In the first experiment (experiment 1), solutions of polyethylene glycol 6000 (PEG 6000) were used, providing osmotic potentials of -0.3; -0.6; -0.9; -1.2 and -1.5 MPa; however, in the second trial (experiment 2) osmotic potentials of -0.1; -0.2; -0.3; -0.4 and -0.5 MPa were used. At the end of the test, the ungerminated seeds for each treatment were washed and germinated on a filter paper moistened with water. The germination and vigor of the seeds were evaluated through the first germination count, germination test, germination speed index and average germination time. The experimental design was completely randomized, in a 2 x 6 factorial scheme, totaling twelve treatments, with four replicates of 50 seeds each, in both trials. Water stress negatively affects the performance of A. deflexus seeds, reducing germination and vigor from -0.1 MPa. Seed germination was compromised by the absence of light, regardless of the applied stress levels. There was an increase in seed germination after application of the same at higher levels of water stress.

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Agronomic performance of onion hybrids in Baraúna, in the semi-arid region of Brazil

Cited by 21 publications

References 10 publications

Fertility restoration locus and cytoplasm types in onion

Fertility restoration locus and cytoplasm types in onion

Limitations of PCR‐based molecular markers to identify male‐sterile and maintainer plants from Indian onion (Allium cepa L.) populations

Recovery and germinative response of Amaranthus deflexus L. seeds under different levels of water stress and luminosities

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