Research Article

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11/25/2003
Cytogenetic behavior; Gene marker; Interspecific hybrids; Introgression

Controlled and natural hybridization between cassava and wild relatives does occur. Barriers within the genus appear to be weak due to recent evolution of the group. All Manihot species examined cytogenetically have a chromosome number of 2n = 36. However, they behave meiotically as diploids. The weak interspecific barriers have led to an extremely heterozygous gene pool that may begin ... more

N.M.A. Nassar
05/11/2007
Amino acids; Cassava; Interspecific hybrids; Lysine; Methionine; Protein content

Cassava roots have a low-protein content (0.7-2%). Amino acids such as lysine and methionine are also low, and some research reports have indicated the absence of methionine. The amino acid profiles of a common cassava cultivar and an interspecific hybrid, namely ICB 300, were determined using the computerized amino acid analyzer Hitachi L-8500. The interspecific hybrid has 10 times ... more

N.M.A. Nassar; M.V. Sousa
08/12/2013
Allopolyploids; GISH; Intergeneric hybrids; Interspecific hybrids; Plant improvement

Genomic in situ hybridization (GISH), which is a modification of fluorescent in situ hybridization, has been widely used in the study of plants. It has become one of the most important techniques for molecular cytogenetics. GISH is a technique that allows distinguishing the genomes in a cell. With this technique, it is possible to differentiate the genomes in a hybrid; ... more

G.S. Silva; M.M. Souza
04/12/2013
Cassava; Essential amino acids; Interspecific hybrids; Protein

Cassava (Manihot esculenta) is a principal food for large populations of poor people in the tropics and subtropics. Its edible roots are poor in protein and lack several essential amino acids. Interspecific hybrids may acquire high protein characteristics from wild species. We analyzed 19 hybrids of M. esculenta with its wild relative, M. oligantha, for crude ... more

P.T.C. Gomes; N.M.A. Nassar
03/13/2013
Interspecific hybrids; ISSR; Morphological trait; RAPD; Solanum melongena; Solanum torvum

Interspecific hybrids between cultivars of eggplant (Solanum melongena L.) and its wild relative S. torvum, which has disease resistance and desirable traits for crop improvement, were obtained by cross-hybridization and embryo rescue. Twenty-one hybrid progenies were obtained and examined based on morphological traits, RAPD and ISSR markers. Five of them were confirmed ... more

J. Kumchai; Y.C. Wei; C.Y. Lee; F.C. Chen; S.W. Chin
03/26/2014
Crambe abyssinica; Crambe hispanica; Crambe kralikii; Cytogenetics; Interspecific hybrids; morphology

In this paper, interspecific crosses among Crambe abyssinica, Crambe hispanica, and Crambe kralikii were reported. In the C. hispanica x C. abyssinica (H x A) cross, 118 F1 hybrids were produced without embryo rescue, while 5 F1 hybrids were obtained with embryo rescue, when C. hispanica was used as the female ... more

X.Z. Du; B.L. Huang; H. Guan; Z.Y. Li; B.Q. Huang
01/31/2020
Crop breeding; Genetic improvement; Tree-based regression methods

Genome-Wide Selection (GWS) uses molecular markers to predict the genetic merit of animals and plants. Usually, a high density of molecular markers to predict this genetic merit is used. Thus, statistical methods need to deal with problems of high dimensionality, multicollinearity and computational efficiency. We examined a set of machine learning methods, in ... more

L.S. Silveira; L.P. Lima; M. Nascimento; A.C.C. Nascimento; F.F. Silva