Arabidopsis thaliana genome is much larger than ~125 Mb
The landmark paper that first reported the complete nuclear DNA sequence of Arabidopsis thaliana estimated its genome size as ~125 Mb and assumed that unsequenced regions contribute ~10 Mb. Bennett et al. (pp. 547-557) used flow cytometry to estimate DNA in A. thaliana, using the nematode Caenorhabditis elegans (size ~100 Mb) as a benchmark standard. They conclude that 125 Mb underestimates the arabidopsis genome by 25 %. The true genome size appears to be ~157 Mb.
