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记忆它们的是被子植物和裸子植物等胚种。What recorded them were embryos of angiosperm and gymnosperm.

在数据库的统计数据基础上,我们分析了裸子植物的染色体特征。By data collection of the database, we analyzed chromosome features of the group Gymnosperm.

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被子植物以外的种子植物统称裸子植物,以种子裸露为特征。Gymnosperm A general term for any seed plant except the angiosperms , characterized by bearing naked seeds.

由此可以推测蕨类植物和裸子植物中输导水分和矿物质的管状分子主要为管胞。From the present results, we considered that tracheary elements that conduct water and mineral in ferns and gymnosperm are tracheids.

是裸子植物花粉占绝对优势,蕨类孢子含量很低。The characters of assemblage are that the pollen of gymnosperm make up absolute predominance, content of pteridophytic spores are very low.

裸子植物具有悠久的演化历史,其化石记录可上溯至泥盆纪。Plants of Gymnosperm had been through a long historical evolution on earth, fossil records of which originated from the late Devonian period.

中生代,广东植物区系成分发生了很大的变化,裸子植物大量繁盛,但总体上是在本区晚古生代华夏植物区系的基础上演化而来的。In Mesozoic, Guangdong flora had a big change, the gymnosperm was prosperous, but it was evolved from the late Paleozoic Cathaysian flora as a whole.

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从第二纪开始,广东植物区系成分变得更加复杂多样,被子植物大量发展,取代了裸子植物占据统治地位。Guangdong flora became more complex and multiplex from the beginning of Tertiary. The angiosperm developed in mass and dominated instead of gymnosperm.

中国拥有世界上最丰富的裸子植物区系,对理解全球裸子植物分布变化与系统演化具有重要意义。China has the richest flora of gymnosperm in the world, which is crucial for understanding the change of global distribution and phylogeny of gymnosperm.

与一般植物染色体的常见变异形式相反,在裸子植物中存在从高不对称性到低不对称的变异形式。Contrary to common variation type in Angiosperms, the variation from high unsymmetric karyotype to low unsymmetric karyotype was found in existence in Gymnosperm.

CHS基因在裸子植物中的拷贝数较少,而在被子植物中拷贝数变化很大。It has also been found that the gymnosperm plants have few copies of CHS gene in a particular nuclear genome, but copy number varies greatly in the angiosperm plants.

调查了呼和浩特市12条主要道路绿地树种的现状,道路绿化树种有27种,其中裸子植物5种,被子植物22种。Investigated the Huhhot 12 main road green space plant landscape present situation, The path afforests the tree seed to have 27 kinds, in which gymnosperm 5 kinds, the angiosperm 22 kinds.

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我们以拟南芥为主要的模式研究对象,同时也关注表观遗传学在作物和裸子林业植物中的应用。We are mainly focused the model plant Arabidopsis thaliana, which is an ideal system to study epigenetic processes, but we are also interested in other plants such forestry gymnosperm species.