Cytokinins modulate auxin-induced organogenesis in plants via regulation of the auxin efflux

• Název česky: Cytokininy v rostlinách modulují auxinem indukovanou organogenezi pomocí regulace auxinového efluxu
• Autoři: PERNISOVÁ Markéta; KLÍMA Petr; HORÁK Jakub; VÁLKOVÁ Martina; MALBECK Jiří; SOUČEK Přemysl; REICHMAN Pavel; HOYEROVÁ Klára; DUBOVÁ Jaroslava; FRIML Jiří; ZAŽÍMALOVÁ Eva; HEJÁTKO Jan
• Rok publikování: 2009
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Proceedings of the National Academy of Sciences of the United States of America
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• Doi: http://dx.doi.org/10.1073/pnas.0811539106
• Obor: Genetika a molekulární biologie
• Klíčová slova: de novo organogenesis; PIN expression; two-component signalling; root meristem; auxin maxima
• Popis: Auxin and cytokinin (CK) are important regulators of the developmental fate of pluripotent plant cells. The molecular nature of their interactions is largely unknown. Here we show that CK modulates auxin-induced organogenesis (AIO) via regulation of efflux-dependent, intercellular auxin distribution. Auxin, but not CK, is capable to trigger organogenesis in hypocotyl explants. AOI is accompanied with endogenous CKs production and tissue-specific activation of CK signalling. CK affects differential auxin distribution and the CK-mediated modulation of organogenesis is simulated by inhibition of polar auxin transport. CK reduces auxin efflux from cultured tobacco cells and regulates expression of auxin efflux carriers from the PIN family in hypocotyl explants. Endogenous CK levels influence PIN transcription and are necessary to maintain intercellular auxin distribution in planta.

Související projekty

• Molekulární podstata buněčných a tkáňových regulací
• Regulace morfogeneze rostlinných buněk a orgánů