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Histological Observation of Somatic Embryogenesis and Adventitious Buds Induction from Ginkgo biloba L.Different Explants in vitro Culture

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Chinese Forestry Science and Technology 2012年第3期11卷 81-81页

作者： Sheng Lili Chen Ying Wang Nanyang Xu Caiping Cao Fuliang School of Forest and Environment Nanjing Forestry University

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.

关键词： Ginkgo biloba L. cytological observation somatic embryogenesis adventitious buds induction adventitious roots formation in vitro culture

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浅析影响英语新词发展的主要因素(英文)

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海外英语 2010年第12X期 247-247页

作者：黄丽南京铁道职业技术学院江苏南京210015

This study aims to analyze the main factors influencing the development of English new words.Language is always changing,especially at the late period of 20th century.Times change,develops very quickly.Every year,the growing number of new words and new meanings are in English vocabulary and can enter to database about 1500-1600.The main factors for this are the development of science and technology and economy,the instability of the world situation and politics in different countries,and the change of social life.In order to suit this new situation,people have created numerous new words.It is good for English learners to keep up with the development of English new words.

关键词： new words word formation main factors

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