- A homeodomain leucine zipper gene from Craterostigma plantagineum regulates abscisic acid responsive gene expression and physiological responses. Deng, X., Phillips, J., Bräutigam, A., Engström, P., Johannesson, H., Ouwerkerk, P.B., Ruberti, I., Salinas, J., Vera, P., Iannacone, R., Meijer, A.H., Bartels, D. Plant Mol. Biol. (2006)