D-type cyclins activate division in the root apex to promote seed germination in Arabidopsis.

ABSTRACT: Seeds provide survival and dispersal capabilities by protecting the dormant mature plant embryo. Germination and resumption of development under favourable conditions requires the reinitiation of cell growth and division through poorly understood processes. Here we show that four phases of cell division activation during germination in Arabidopsis are related to external morphological changes. Cell division initiates in the root apical meristem (RAM) before root protrusion, followed by sequential activation of cell division in the cotyledons, shoot apical meristem (SAM), and secondary meristems. Major changes in transcript levels of >2,000 genes precede root emergence, including expression peaks of six D-type (CYCD) and two A-type cyclins. Two further CYCDs are activated later with the SAM

SUBMITTER: Masubelele NH 

PROVIDER: S-EPMC1266134 | biostudies-literature | 2005 Oct

REPOSITORIES: biostudies-literature