New phenomenon in early development of sporelings in Gracilaria asiatica Chang et Xia(Gracilariaceae,Rhodophyta)  

作　　者：赵凤娟 王爱华 刘吉东 段德麟 

机构地区：[1]Institute of Oceanology, Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2006年第4期364-369,共6页中国海洋湖沼学报（英文版）

基　　金：Supported by NSFC (No. 40376049) and the Knowledge Innovation Program of Chinese Academy of Sciences and the Shandong Agricultural Seed Stock Breeding Project (Granted to D. L. Duan).

摘　　要：Study on the early development of sporelings from carpospores of Gracilaria asiatica Chang et Xia was conducted indoors under controlled culture conditions. Besides normal development of sporelings, a new developmental phenomenon of filamentous frond was observed. It was composed of one or two rows of cells, and took place from the outmost brim of the basal disc. During the early disc stage of germinated carpospores, one or two filamentous fronds formed on about 10% basal discs. Simul-taneously, young fronds began to arch slightly from the centers of single and coalescent discs; lately more filamentous fronds up to 80% appeared on the brims of basal discs. Meanwhile one or more upright fronds protuberated on the basal discs. Generally, filamentous fronds exhibited in self-existence or co-existence forms with normal young sporelings on the same basal disc, and single cell detached from filamentous fronds developed into a new filamentous frond. This new phenomenon exhibited a unique differentiation pathway during the early development of G. asiatica, which would be potential for the ap-plication in artificial sporelings nursery.Study on the early development of sporelings from carpospores of Gracilaria asiatica Chang et Xia was conducted indoors under controlled culture conditions. Besides normal development of sporelings, a new developmental phenomenon of filamentous frond was observed. It was composed of one or two rows of cells, and took place from the outmost brim of the basal disc. During the early disc stage of germinated carpospores, one or two filamentous fronds formed on about 10% basal discs. Simultaneously, young fronds began to arch slightly from the centers of single and coalescent discs; lately more filamentous fronds up to 80% appeared on the brims of basal discs. Meanwhile one or more upright fronds protuberated on the basal discs. Generally, filamentous fronds exhibited in self-existence or co-existence forms with normal young sporelings on the same basal disc, and single cell detached from filamentous fronds developed into a new filamentous frond. This new phenomenon exhibited a unique differentiation pathway during the early development of G. asiatica, which would be potential for the application in artificial sporelings nursery.

关 键 词：filamentous fronds basal disc sporeling early development Gracilaria asiatica 

分 类 号：S968.434[农业科学—水产养殖]