典型文献
First ovules integument:what roles?
文献摘要：
The Famennian is a period of increased taxonomic diversity for the first representatives of the major plant groups,especially the spermatophytes(i.e.the seed plants)that,today,represent the most abundant and diversified plant group on Earth[1,2].Early spermatophytes evolved a unique ovule-centered reproductive syndrome that allowed them to germinate and grow rapidly in disturbed habitats and,secondarily,to colonize dry habitats un-favorable to the reproduction of their free-sporing predeces-sors[3,4](Fig.1).In these ovulate organisms,the female ga-metophyte grows and produces gametes inside the indehiscent megasporangium(nucellus)that differentiates a pollen cham-ber retaining the pollen grains in its apical part.An integument encloses the nucellus.Like the Runcaria protovule that preceded them by 20 million years,Famennian ovules were all surrounded by a cupule,except perhaps Spermolithus and Warsteinia[5-7].The latter,however,have been found isolated and may also have had a cupule remaining on the plant that produced them.
文献关键词：
中图分类号：
作者姓名：
Brigitte Meyer-Berthaud
作者机构：
AMAP,Université de Montpellier,CNRS,CIRAD,INRAE,IRD,France
文献出处：
引用格式：
[1]Brigitte Meyer-Berthaud-.First ovules integument:what roles?)[J].国家科学评论（英文版）,2022(04):16-17
A类：
Famennian,spermatophytes,sporing,predeces,ovulate,metophyte,indehiscent,megasporangium,nucellus,encloses,Runcaria,protovule,cupule,Spermolithus,Warsteinia
B类：
First,ovules,integument,what,roles,period,increased,taxonomic,diversity,first,representatives,major,groups,especially,seed,plants,that,today,most,abundant,diversified,Earth,Early,evolved,unique,centered,reproductive,syndrome,allowed,them,germinate,rapidly,disturbed,habitats,secondarily,colonize,dry,favorable,reproduction,their,free,sors,Fig,In,these,organisms,female,grows,produces,gametes,inside,differentiates,pollen,cham,ber,retaining,grains,its,apical,part,An,Like,preceded,by,million,years,were,surrounded,except,perhaps,latter,however,have,been,found,isolated,may,also,had,remaining,produced
AB值：
0.535226
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机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
