The results of studying the gravisensitivity of protonemata branches in Ceratodon purpureus (Brid.) Hedw. moss, a setpoint angle of which changed depending on a gravity vector and a gradient of auxin distribution, are presented. The suppression of auxin polar transport under the N 1 naphthyl-phthalamic acid (NPA) action caused the counteraction against gravity up to plagiotropic growth of lateral branches. A nucleus plays an active role in protonemata branching; its migration to the new growth area accelerated by the polarizing of gravity. It was established that coordination of growth and division processes were disrupted by gravity, but proliferative activity did not change. A local activation of microtubules preceded to the initiation of branching. MTs surrounded the nucleus during its migration, realizing the signaling and transport functions.

Keywords: auxin, setpoint angle, lateral branch, gravisensitivity, nucleus, microtubule

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