Maier U G
Institute of Biology II, Freiburg, FRG.
Biosystems. 1992;28(1-3):69-73. doi: 10.1016/0303-2647(92)90009-n.
Cryptomonads are a group of unicellular eukaryotic algae with unusual features. First, their plastids are surrounded by four membranes and second, between the two pairs of membranes there is a plasmatic compartment. This supernumerary eukaryotic compartment of the cryptomonad cell is devoid of mitochondria but contains starch grains, 80S ribosomes and a small vestigial eukaryotic nucleus called the nucleomorph. Isolation and characterization of the four genomes (from mitochondrion, plastid, nucleus and nucleomorph) of one cryptomonad, Pyrenomonas salina, demonstrates that the cryptomonads have originated from an unicellular organism related to green algae which endosymbiotically took up a eukaryotic protist related to the red algae.
隐藻是一类具有独特特征的单细胞真核藻类。首先，它们的质体被四层膜包围；其次，在两对膜之间有一个细胞质区室。隐藻细胞的这个额外的真核区室没有线粒体，但含有淀粉粒、80S核糖体和一个称为核质体的小的残余真核细胞核。对一种隐藻——盐生双鞭藻的四个基因组（来自线粒体、质体、细胞核和核质体）进行分离和表征，结果表明隐藻起源于一种与绿藻有关的单细胞生物，该单细胞生物通过内共生作用摄取了一种与红藻有关的真核原生生物。
