Research Article

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11/03/2009
Aneuploidy; Apomixis; interspecific hybrid; Wild species

An interspecific hybrid between cassava and Manihot glaziovii acquired an apomixis gene from the parent M. glaziovii. This hybrid was exposed to open pollination during three subsequent generations. Seven sibs and the maternal progenitor of the fourth generation were genotyped using six microsatellite loci previously developed for cassava. All sibs were identical with ... more

N.M.A. Nassar; P.T.C. Gomes; A.M. Chaib; N.N. Bomfim; R.C.D. Batista; R.G. Collevatti
10/05/2011
Apomixis; Callose; Embryology; Flow cytometry screen seed; Sexual reproduction

Apomixis is a particular mode of reproduction that allows progeny formation without meiosis and fertilization. Eulaliopsis binata, a tetraploid apomictic species, is widely used for making paper, rope and mats. There is great potential for fixation of heterosis in E. binata due to autonomous endosperm formation in this species. Although most of its embryo sac originates ... more

L. Liu; J.J. Li; Y.D. Ouyang; J.L. Yao
09/18/2013
Alcoholism; Atp5g3; Epigenetic; Expression; Mouse; Transcriptome

The mitochondrial ATP synthase, subunit c, isoform 3 gene (Atp5g3) encodes subunit 9, the subunit of the multisubunit enzyme that catalyzes ATP synthesis during oxidative phosphorylation in mitochondria. According to the Ensembl database, Atp5g3 in mice is located on chromosome 2 between 73746504 and 73749383 bp, within the genomic regions of two sets of quantitative ... more

Y. Huang; L. Wang; B. Bennett; R.W. Williams; Y.J. Wang; W.K. Gu; Y. Jiao
06/29/2002
Apomixis; Apospory; Heterosis; Interspecific hybridization; Triploid

Apomixis means seed formation without fertilization. In cassava (Manihot esculenta) it is an alternative to reproduction by cuttings, which normally transmits pathogens and leads to an accumulation of viral and bacterial diseases. Apomixis also assures preservation of heterosis and avoids genetic segregation. It occurs in wild relatives of cassava and has been transferred ... more

N.M.A. Nassar
12/11/2007
Amino acids; Apomixis; Drought; Protein

Wild cassava relatives are perennials and vary in growth pattern from nearly acaulescent subshrubs to small trees. They have been used as a source of useful characters such as high protein content, apomixis, resistance to mealybug and mosaic disease, and tolerance to drought. Indigenous clones are a potential source of β-carotene and lycopene. Apomixis genes have been transferred to the crop ... more

N.M.A. Nassar
08/07/2006
Apomixis; Microsatellite; Open pollination; Protogeny; Second generation progeny

Cassava is the main staple for more than 800 million people in the tropics. It is propagated vegetatively by stem cuttings, which maintains superior genotypes but favors disease accumulation and spread. In this report, we present the results of the screening of the progeny and the second generation of the clone UnB 307 for apomixes using microsatellites. A total of 29 plants were ... more

N.M.A. Nassar; D.C. Kalkmann; R. Collevatti
08/11/2006
Apomixis; Interspecific crosses; Polyploidy

A new species was synthesized artificially by chromosome doubling in a hybrid. The ensuing polyploid type exhibits an apomictic nature and maintains its morphological characteristics in the progeny. It showed a frequency of multiembryonic sacs of 29% in the ovules examined, whereas sacs were absent in the diploid type.

*In honor of deceased Professor Vieira who dedicated a part ... more

N.M.A. Nassar
11/29/2005
Apomixis; Molecular marker; Satellite technique

Apomixis genes have been successfully transferred to cassava (Manihot esculenta) by hybridizing it with the wild species, M. glaziovii. The interspecific hybrid of cassava and M. glaziovii was exposed to open pollination during three subsequent generations. Seven sibs and the maternal progenitor of the fourth generation were genotyped using five ... more

N.M.A. Nassar; R.G. Collevatti
12/08/2006
Allopolyploidy; Brachiaria brizantha; Forage grass; Microsporogenesis; Pollen viability

In the hexaploid (2n = 6x = 54) accession B176 of Brachiaria brizantha, one cytological characteristic differentiated it from the other accessions previously analyzed with the same ploidy level. Nearly 40% of meiocytes displayed the chromosome set arranged at two metaphase plates at the poles of the cell, close to the membrane. In these cells, both metaphase plates were ... more

C. Risso-Pascotto; D.V. Mendes; N. Silva; M.S. Pagliarini; C.B. Valle
08/18/2011
Meiosis; Moringa oleifera; Pollen viability; Tripolar spindles; Unreduced gametes

Although originally from India, Moringa oleifera is now cultivated throughout most of the tropics, including Brazil. Despite its multipurpose value for food and traditional medicine, little is known about the meiotic behavior and pollen viability of M. oleifera. We evaluated microsporogenesis and pollen viability in eleven plants grown in southern Brazil (Maringá, Paraná ... more

N. Silva; A.B. Mendes-Bonato; J.G.C. Sales; M.S. Pagliarini

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