Bizarre lamina margins in tae mutant of Arabidopsis thaliana (L.) Heynh. (Brassicaceae)

Phenotypic effects of tae mutation on leaves greatly differ from those produced by any known so far mutant genes involved in leaf development in Arabidopsis thaliana. This mutation does not affect the basic anatomical structure of the lamina, though it causes looser palisade and spongy chlorenchyma. Tae mutation causes local suppression of the lamina growing in width which is locally accompanied by 1) altered generating functioning of the sub-marginal meristem which results in a changed mesophyll development up to its absence in the lamina margin; 2) disharmonious growing in width of adaxial and abaxial sides of the lamina; 3) development of the secondary margin of the adaxial side of the lamina; and 4) local growing of the secondary margin into ectopic lobe(s), the latter being typically absent in A. thaliana.