N.M.A. Nassar
Periclinal chimera technique: new plant breeding approach
Plant interspecific periclinal chimeras are a mosaic formed by tissues from two species. They are manipulated here as an efficient plant breeding tool for cassava root yields. In this study, plants synthesized from two chimeras, designated as chimera 2 and chimera 4, were characterized morphologically and cytologically to unravel the origin of their tissue layers (L.. Read More»
Genet. Mol. Res. 16(3): gmr16039790
DOI: 10.4238/gmr16039790
Apomixis and cassava
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 trans.. Read More»
Genet. Mol. Res. 1(2):
Cassava, Manihot esculenta Crantz, genetic resources: origin of the crop, its evolution and relationships with wild relatives
About 98 species of Manihot are known. All of them are native to the New World and are concentrated in four regions in Brazil and Central America. All the Manihot species so far examined have 2n = 36 chromosomes. Interspecific hybrids between cassava and its wild relatives show relatively normal meiosis, and further generations can be obtained. Electrophoresis shows.. Read More»
Genet. Mol. Res. 1(4):
Cassava, Manihot esculenta Crantz genetic resources: VI. Anatomy of a diversity center
Central Brasil is one of the four centers of diversity of Manihot species. Of 26 wild Manihot species reported to occur in this region, 20 were collected from two limited areas, each less than 100 km in diameter. These two areas are Goiás Velho and Corumbá de Goiás. Considering the Harlan concept of geographic patterns of variation of cultivated.. Read More»
Genet. Mol. Res. 2(2):
Gene flow between cassava, Manihot esculenta Crantz, and wild relatives
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.. Read More»
Genet. Mol. Res. 2(4):
Amarelinha do Amap�¡: a carotenoid-rich cassava cultivar
Eight cassava (Manihot esculenta Crantz) cultivars, of which four are indigenous to the Amazon region, along with an interspecific hybrid, were assessed for their carotenoid content. They were propagated and are maintained in the living Manihot collection at the University of Brasília. The cultivar “Amarelinha do Amapá”, which was collected from the State of Amap&.. Read More»
Genet. Mol. Res. 8(3): vol8-3gmr625
DOI: 10.4238/vol8-3gmr625
Cassava interspecific hybrids with increased protein content and improved amino acid profiles
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 protein, amino acid profile, and to.. Read More»
Genet. Mol. Res. 12(2): 2013.April.12.8
DOI: 10.4238/2013.April.12.8
Cytogenetic and molecular analysis of an apomictic cassava hybrid and its progeny
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 wi.. Read More»
Genet. Mol. Res. 8(4): vol8-4gmr674
DOI: 10.4238/vol8-4gmr674
Genetic, embryonic and anatomical study of an interspecific cassava hybrid
A molecular, anatomical and cytogenetic study of an interspecific hybrid between Manihot esculenta (cassava) and the wild species M. oligantha was carried out. Cytogenetics revealed relatively complete chromosome pairing and high viability of the pollen grains. Ovule structure examined by the clearing method showed polyembryony in 2.7% of the ovules. Doubling of the.. Read More»
Genet. Mol. Res. 9(1): vol9-1gmr746
DOI: 10.4238/vol9-1gmr746
Synthesis of periclinal chimera in cassava
We provide the first report on the synthesis of a very productive interspecific periclinal chimera of cassava, with large and edible roots. The epidermal tissue of the chimera was formed by the cultivated species Manihot esculenta (E), and the subepidermis and internal tissue were formed by the wild species, Manihot fortalezensis (F). We used cytogenetics and morphological analyses to determine th.. Read More»
Genet. Mol. Res. 12(1): 2013.February.27.10
DOI: 10.4238/2013.February.27.10
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