The synthesis of a new cassava-derived species, Manihot vieiri Nassar.
نویسنده
چکیده
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.
منابع مشابه
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...
متن کاملChromosome doubling induces apomixis in a cassava x Manihot anomala hybrid.
A new species was synthesized artificially by chromosome doubling of an interspecific hybrid between cassava and Manihot anomala. The ensuing polyploid type exhibits an apomictic nature and maintains its morphological characteristics in the progeny. It showed a 29% frequency of multiembryonic sacs in its examined ovules whereas the multiembryonic sacs were absent in the diploid type.
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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 affinity among wild species ...
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متن کاملCassava, 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 crops, it is assumed that the two areas are micro...
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ورودعنوان ژورنال:
- Genetics and molecular research : GMR
دوره 5 3 شماره
صفحات -
تاریخ انتشار 2006