Effect of the Auxin Polar Transport Inhibitor on the Morphogenesis of Leaves and Generative Structures during Fasciation in Arabidopsis thaliana (L.) Heynh.

E. A. Bykova, D. A. Chergintsev, T. A. Vlasova, and V. V. ChoobTranslated by N. Statsyuk

Faculty of Biology, Moscow State University, Moscow, 119234 Russia

Correspondence to: e-mail: katebykova.90@mail.ru

Received 7 October, 2015

Abstract—An increase in the proliferative activity of a shoot apical meristem (SAM) and the further accumulation of a pool of undifferentiated cells (fasciation) results in phyllotaxis changes. In the case of Arabidopsis thaliana, a typical spiral leaf arrangement is replaced by an opposite or verticillate one (depending on the level of a fasciation manifestation). Pistil development in mutant plants is accompanied by the appearance of a group of undifferentiated meristematic cells in its central part. The addition of N-1-naphthylphthalamic acid (NPA) causes an increase in the meristem volume and number of stipules in both mutant and control plants. The NPA effect on the floral morphogenesis results in a significant growth of meristemic cell pool. The interaction of different mechanisms of a meristem volume control is discussed.

Keywords: SAM, NPA, fasciation, blastozone, A. thaliana

DOI: 10.1134/S1062360416040032