thumb|Diagram of a four membraned plastid containing a nucleomorph Nucleomorphs are small, vestigial eukaryotic nuclei found between the inner and outer pairs of membranes in certain plastids. They are thought to be vestiges of red and green algal nuclei that were engulfed by a larger eukaryote. Because the nucleomorph lies between two sets of membranes, nucleomorphs support the endosymbiotic theory and are evidence that the plastids containing them are complex plastids. Having two sets of membranes indicate that the plastid, a prokaryote, was engulfed by a eukaryote, an alga, which was then e
Wikidata facts
- Part of
- plastid
Show 1 more fact
- exact match
- purl.obolibrary.org/obo/GO_0033009
Sources (1)
via Wikidata · CC0
Article · 中文
类核体（英語：nucleomorph）又稱核形體，是在隐藻 和（屬有孔蟲界）叶绿体内的结构，位於其內外膜結構（periplastidial compartment）之間，為次級內共生中內共生體細胞核的殘跡。這兩類生物的葉綠體皆有四層膜，是由一個真核生物吞噬原核生物形成葉綠體後，再被另一個真核生物吞噬而來。類核體中也具有DNA（類核體基因組），但均已大幅退化縮減，例如的類核體基因組已在2001年被定序，長度僅有551kb，只保留了513個基因；（一種綠蛛網藻）的類核體基因組則在2006年被定序，僅長373kb，包含331個基因。序列分析顯示隱藻的類核體來自紅藻，綠蛛網藻的類核體則來自綠藻。
Abstract from DBpedia / Wikipedia · CC BY-SA