Chromosome doubling induces apomixis in a cassava x Manihot anomala hybrid.
نویسنده
چکیده
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.
منابع مشابه
Apomixis induces new species of Manihot*
Apomixis means production seed without fertilization. It perpetuates genotypes adapted to a certain environment. Genes of apomixis were detected in wild cassava and transferred to the cultivate by the senior author. A new species of Manihot species has evolved in our Living collection, at the Universidade de Brasília. Multiembryonic sacs were noted in its ovules. It bred true for four generatio...
متن کاملEmbryonic, Meiotic and Molecular Analysis of Apomictic Cassava (Manihot esculenta Crantz)
Apomixis genes have been successfully transferred to cassava by hybridizing it with the wild species, M. glaziovii. An interspecific hybrid of cassava and M. glaziovii was left for open pollination during three subsequent generations. Seven sibs and their maternal progenitor of the fourth generation were genotyped using five microsatellite loci previously developed for cassava. All sibs were id...
متن کاملCassava, 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 affinity among wild species ...
متن کاملApomixis 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 transferred successfully from Mani...
متن کاملThe nature of apomixis in cassava (Manihot esculentum, Crantz).
Apomixis in cassava is formed by aposporic embryo sacs which arise from cells in nucellus or from cells in the sexual embryo sac. There is an association between sterility and apomixis. It seems that sterility caused by defected meioses triggers a specific gene for exhibiting apomixis. This apomictic mechanism is favoured by natural selection since it offers an escape from lethality and provide...
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ورودعنوان ژورنال:
- Hereditas
دوره 143 2006 شماره
صفحات -
تاریخ انتشار 2006