DNA analysis for choromosome size changing in plant

被子植物表现出异常广泛的基因组大小，几乎是2000倍。测得的DNA含量最大的是贝母属植物(百合科)，基因组中约有130pG(13万个碱基)，具有10到20微米的巨大染色体。相比之下，最近在两个食肉植物属(香菇科)中发现的最小基因组只有0.06pG(63个碱基)。基因组范围较广的植物群仅限于菊科、豆科、百合科、兰科、禾本科等大科。然而，太阳露食肉植物群，龙舌兰科及其近缘科龙舌兰科，表现出出人意料的高基因组大小变异，染色体从小到大。通过对菊科植物紫薇和龙葵属植物大(L型)和小(S型)染色体组的分析，获得了新的认识。

Angiosperms show unusually wide range of genomes size with nearly 2,000-fold. The largest DNA amount measured is found in Fritillaria species (Liliaceae) with about 130 pg (130,000 Mbp) in the genome, possessing gigantic chromosomes with 10 to 20 µm. In contrast, the smallest genome is recently found in two carnivorous plant species of Genlisea (Lentibulariaceae) with just 0.06 pg (63 Mbp). The plant groups with wide genome ranges are restricted to some large families such as Asteraceae, Fabaceae, Liliaceae, Orchidaceae and Poaceae. Whereas sundew carnivorous plant group, the Droseraceae and its closely related family Drosophyllaceae, show unexpectedly high genome size variation with tiny to giant chromosomes. New insight was obtained after analyzing large (L-type) and small (S-type) chromosome sets in the genome composition in Aster (Asteraceae) and Drosera (Droseraceae).