In this paper a general introduction is given to research advances in genetics improvement and breeding of Chinese aspen (Populus davidiana Dode) in China. This introduction includes natural distribution and collectio...In this paper a general introduction is given to research advances in genetics improvement and breeding of Chinese aspen (Populus davidiana Dode) in China. This introduction includes natural distribution and collection, conservation, gene diversity, provenance trial, crossing breeding, vegetative propagation and disease resistant etc. Based on the current situation of forest tree breeding in China, some strategic suggestions concerning the future development of Chinese aspen genetics improvement in China are presented, taking into consideration the existing domestic demands of forestry production and international trends in forest tree breeding.展开更多
Cryopreservation of spermatozoa is of strategic importance in aquaculture breeding,large-scale seed production,and the conservation of endangered species.While research on sperm cryopreservation in marine mollusks lag...Cryopreservation of spermatozoa is of strategic importance in aquaculture breeding,large-scale seed production,and the conservation of endangered species.While research on sperm cryopreservation in marine mollusks lags behind that of livestock and fish species,significant progress has been made in recent years,particularly for key economically valuable species such as oysters,mussels,scallops,pearl oysters,clams,and abalones.This review systematically addresses four key technical aspects of sperm cryopreservation in bivalves and gastropods:(1)optimization of extender formulations;(2)selection of cryoprotectants;(3)regulation of cooling rates during the freezing process;and(4)thawing temperature control.Existing research has demonstrated that a combination of physiological traits,environmental factors,and cryopreservation protocols influences sperm quality.However,critical knowledge gaps remain in understanding marine mollusk sperm cryopreservation.This article synthesizes recent advancements and offers theoretical and practical frameworks for standardizing cryopreservation protocols,aiming to enhance post-thaw sperm viability and promote sustainable management of molluscan genetic resources.展开更多
文摘In this paper a general introduction is given to research advances in genetics improvement and breeding of Chinese aspen (Populus davidiana Dode) in China. This introduction includes natural distribution and collection, conservation, gene diversity, provenance trial, crossing breeding, vegetative propagation and disease resistant etc. Based on the current situation of forest tree breeding in China, some strategic suggestions concerning the future development of Chinese aspen genetics improvement in China are presented, taking into consideration the existing domestic demands of forestry production and international trends in forest tree breeding.
文摘Cryopreservation of spermatozoa is of strategic importance in aquaculture breeding,large-scale seed production,and the conservation of endangered species.While research on sperm cryopreservation in marine mollusks lags behind that of livestock and fish species,significant progress has been made in recent years,particularly for key economically valuable species such as oysters,mussels,scallops,pearl oysters,clams,and abalones.This review systematically addresses four key technical aspects of sperm cryopreservation in bivalves and gastropods:(1)optimization of extender formulations;(2)selection of cryoprotectants;(3)regulation of cooling rates during the freezing process;and(4)thawing temperature control.Existing research has demonstrated that a combination of physiological traits,environmental factors,and cryopreservation protocols influences sperm quality.However,critical knowledge gaps remain in understanding marine mollusk sperm cryopreservation.This article synthesizes recent advancements and offers theoretical and practical frameworks for standardizing cryopreservation protocols,aiming to enhance post-thaw sperm viability and promote sustainable management of molluscan genetic resources.
