As important structures for water and nutrient absorption,lateral roots are formed at regular time points along with root growth.The sites of lateral root initiation are pre-patterned by an oscillatory mechanism known...As important structures for water and nutrient absorption,lateral roots are formed at regular time points along with root growth.The sites of lateral root initiation are pre-patterned by an oscillatory mechanism known as the root clock,which is regulated by carotenoid metabolism.Blocking carotenoid metabolism by D15,a chemical inhibitor,reduces root clock oscillations and lateral root formation.However,the exact nature of carotenoid metabolites that function during this process remains unclear.展开更多
The differentiation process including somatic embryogenesis in different Ginkgo explants in vitro culture were studied by cytological observation.The results are as follows:1) two complete cotyledons and a embryo bud ...The differentiation process including somatic embryogenesis in different Ginkgo explants in vitro culture were studied by cytological observation.The results are as follows:1) two complete cotyledons and a embryo bud were observed in mature embryos and several secretory acavitives appeared in maturation region of embryo buds,hypocotyls,cotyledons and radicles after culturing 20 days;two incomplete cotyledons and a embryo bud primordia were found in large cotyledon embryos.The proembryo of two cells,four cells, multi-cellular,and globular embroy were developed from the callus of the small cotyledon embryos.2) The differentiation of cotyledon explants started from epidermal cells,and gradually formed meristematic cell mass in the cortical cells,and eventually adventitious buds were observed.3) The adventitious roots of Ginkgo originated in the cells at the cross of vascular cambium and vascular rays. 4) The type of rooting belongs to induction type by root primordium.The formed adventitious roots were observed after 20 days.展开更多
基金D.was supported by the Young Scientists Fund of NSFC(32000507).
文摘As important structures for water and nutrient absorption,lateral roots are formed at regular time points along with root growth.The sites of lateral root initiation are pre-patterned by an oscillatory mechanism known as the root clock,which is regulated by carotenoid metabolism.Blocking carotenoid metabolism by D15,a chemical inhibitor,reduces root clock oscillations and lateral root formation.However,the exact nature of carotenoid metabolites that function during this process remains unclear.
文摘The differentiation process including somatic embryogenesis in different Ginkgo explants in vitro culture were studied by cytological observation.The results are as follows:1) two complete cotyledons and a embryo bud were observed in mature embryos and several secretory acavitives appeared in maturation region of embryo buds,hypocotyls,cotyledons and radicles after culturing 20 days;two incomplete cotyledons and a embryo bud primordia were found in large cotyledon embryos.The proembryo of two cells,four cells, multi-cellular,and globular embroy were developed from the callus of the small cotyledon embryos.2) The differentiation of cotyledon explants started from epidermal cells,and gradually formed meristematic cell mass in the cortical cells,and eventually adventitious buds were observed.3) The adventitious roots of Ginkgo originated in the cells at the cross of vascular cambium and vascular rays. 4) The type of rooting belongs to induction type by root primordium.The formed adventitious roots were observed after 20 days.
