Exotic Gossypium germplasm is a rich source of useful agronomic traits for improvement programs of cultivated cotton.Efficient use of genetic variation available in the wild relatives depends
Emergence of transgenic Bt-cotton technology has opened up a new chapter in Indian cotton production in 21st century.The cry1Ac gene of Monsanto derived from American Upland Coker-312 background was not directly suita...Emergence of transgenic Bt-cotton technology has opened up a new chapter in Indian cotton production in 21st century.The cry1Ac gene of Monsanto derived from American Upland Coker-312 background was not directly suitable for varied cotton growing situations in India.Delivery of展开更多
Solanum species have a wide geographic distribution and show a large range of ecological adaptation,and thus have developed strong resistances to a wide range of pests,diseases and abiotic stresses.They represent uniq...Solanum species have a wide geographic distribution and show a large range of ecological adaptation,and thus have developed strong resistances to a wide range of pests,diseases and abiotic stresses.They represent unique material as a source of useful genes and allelic diversity for the tetraploid cultivated potato(Solanum tuberosum).Knowledge of the endosperm balance number(EBN) incompatibility system may be extremely useful for breeders in designing specific crosses schemes for potato breeding.EBN has been experimentally assigned to Solanum species after crosses with standard species whose EBN was arbitrarily established,and assuming the 2 ∶ 1 ratio as a prerequisite for normal endosperm development.The role of the EBN incompatibility system in potato breeding is strongly complemented by 2n gametes.Only 2n gametes can allow inter-EBN crosses and thus gene flow between sexually isolated species.This complementary role of EBN and 2n gametes not only facilitates gene introgression between inter-EBN species,but also maintains the ploidy integrity of the two parental species.Examples are given to illustrate how to use EBN in crossing schemes designed for 2x(2EBN) and 2x(1EBN) species.As increasing in the interest in exploiting exotic germplasm for breeding purposes,it is strongly believed that an understanding of EBN can be used for interspecific gene transfer in any crop species where an EBN-like system operates.展开更多
Recentlyf Du and his team revealed the genomic basis of population differentiation and geographical distribution of Chinese cultivated G hirsutum(upland cotton).Our previous study showed that the large-scale inversion...Recentlyf Du and his team revealed the genomic basis of population differentiation and geographical distribution of Chinese cultivated G hirsutum(upland cotton).Our previous study showed that the large-scale inversions on chromosome A08 are widely distributed in a core collection of upland cotton and have driven population differentiation in G hirsutum.With 3248 tetrapioid cotton germplasms,He et al.identified new inversions on chromosome A06,and found these inversions together with those in chromosome A08 caused subpopulation differentiation Chinese cultivars that were highly con siste nt with their corresp on ding geographical distributions.This work provides new perspectives to further understand environmental adaptation of Chinese upland cotton germplasms.展开更多
The main cultivated varieties in the world belong to the species of upland cotton(Gossypium hirsutum L.),and their genetic background is very narrow.However,the wild species and races in
The wild cotton cultivars and species have abundant genetic polymorphisms,and they possess lots of excellent genes,such as drought resistance,insect resistance,fine and strong fiber,and so on.
Wild relatives and un-adapted germplasm of crop species harbors several adaptive traits.Introgression of genes for economic and adaptive traits brings in novel genetic variation into the gene
文摘Exotic Gossypium germplasm is a rich source of useful agronomic traits for improvement programs of cultivated cotton.Efficient use of genetic variation available in the wild relatives depends
文摘Emergence of transgenic Bt-cotton technology has opened up a new chapter in Indian cotton production in 21st century.The cry1Ac gene of Monsanto derived from American Upland Coker-312 background was not directly suitable for varied cotton growing situations in India.Delivery of
文摘Solanum species have a wide geographic distribution and show a large range of ecological adaptation,and thus have developed strong resistances to a wide range of pests,diseases and abiotic stresses.They represent unique material as a source of useful genes and allelic diversity for the tetraploid cultivated potato(Solanum tuberosum).Knowledge of the endosperm balance number(EBN) incompatibility system may be extremely useful for breeders in designing specific crosses schemes for potato breeding.EBN has been experimentally assigned to Solanum species after crosses with standard species whose EBN was arbitrarily established,and assuming the 2 ∶ 1 ratio as a prerequisite for normal endosperm development.The role of the EBN incompatibility system in potato breeding is strongly complemented by 2n gametes.Only 2n gametes can allow inter-EBN crosses and thus gene flow between sexually isolated species.This complementary role of EBN and 2n gametes not only facilitates gene introgression between inter-EBN species,but also maintains the ploidy integrity of the two parental species.Examples are given to illustrate how to use EBN in crossing schemes designed for 2x(2EBN) and 2x(1EBN) species.As increasing in the interest in exploiting exotic germplasm for breeding purposes,it is strongly believed that an understanding of EBN can be used for interspecific gene transfer in any crop species where an EBN-like system operates.
文摘Recentlyf Du and his team revealed the genomic basis of population differentiation and geographical distribution of Chinese cultivated G hirsutum(upland cotton).Our previous study showed that the large-scale inversions on chromosome A08 are widely distributed in a core collection of upland cotton and have driven population differentiation in G hirsutum.With 3248 tetrapioid cotton germplasms,He et al.identified new inversions on chromosome A06,and found these inversions together with those in chromosome A08 caused subpopulation differentiation Chinese cultivars that were highly con siste nt with their corresp on ding geographical distributions.This work provides new perspectives to further understand environmental adaptation of Chinese upland cotton germplasms.
文摘The main cultivated varieties in the world belong to the species of upland cotton(Gossypium hirsutum L.),and their genetic background is very narrow.However,the wild species and races in
文摘The wild cotton cultivars and species have abundant genetic polymorphisms,and they possess lots of excellent genes,such as drought resistance,insect resistance,fine and strong fiber,and so on.
文摘Wild relatives and un-adapted germplasm of crop species harbors several adaptive traits.Introgression of genes for economic and adaptive traits brings in novel genetic variation into the gene
