Some 60 of monocotyledons and 40 of dicotyledons are polyploid , as are 90 of ferns , many bryophytes , and some algae 60的单子叶植物和40的双子叶植物、 90的蕨类植物、多数苔藓植物以及某些藻类，都是多倍体。
Allopolyploids usually arise from the doubling of chromosomes of a hybrid between species , the doubling often making the hybrid fertile 异源多倍体通常由不同种的二倍体染色体组结合后加倍形成，染色体加倍后通常是可育的。
Medicinal polyploid plants attract great attention because of their gigantic organs , high yields and important medicinal and economic values 摘要多倍体药用植物因器官巨大，产量高，具有重要的药用和经济价值而倍受人们的关注。
Polyploids generally thaw some good characters , for example , vigorous plant , higher biological yield , bigger seed , good quality and special resistantance 多倍体植株具有生长势强、生物学产量高、籽粒大、品质好和抗逆性强等特点。
Method : induction of polyploidy by colchicine treatment is efficacious , and part of the doubled plants were identified as homologmous tetraploids 结果表明：用秋水仙碱诱导菘蓝多倍体植株是有效的，已有部分植株已加倍成为同源多倍体。
The technically effective system in inducement of cereal polyploid will conduce to creating a lot of new genetic resources with polyploid characters 建立多倍体诱导的高效性实用技术体系，将有助于尽快获得大量的多倍体材料和新的遗传资源或种质资源。
Endomitosis the duplication of chromosomes without division of the nucleus , causing polyploidy and leading to an increase in nuclear and cytoplasmic volume 核内有丝分裂：在细胞核不分裂的情况下进行染色体复制，产生多倍体并使细胞体积增大的一种有丝分裂形式。
The properties of the hybrid , such as greater vigor and adaptability , are retained in the allopolyploid in subsequent generations and such organisms are often highly successful 这种具有高度生活力和适应性的杂交在异源多倍体中被保留，而且可以成功的遗传下去。
In this article , ways of polyploidy breeding , the identification of polyploidy , application of watermelon polyploidy , and the prospective of watermelon polyploid breeding are reviewed 文章概述了西瓜多倍体的产生途径、鉴定方法，西瓜多倍体育种的应用以及研究新动向。
There exist three limitations , i . e . , the limitations in ideology , materials ( the number or the type ) and technical approaches , in the research of autopolyploid rice 摘要在同源多倍体水稻的研究中存在3大局限胜，即思想观念的局限阵、材料数量（或材料类型）的局限性和技术思路的局限性。
