Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating damage to its DNA from environmental insults or errors during metabolism.

Any process that activates or increases the rate or extent of cell proliferation.

Any process involved in maintaining the size and shape of a root meristem.

The process in which a SUMO protein (small ubiquitin-related modifier) is conjugated to a target protein via an isopeptide bond between the carboxy-terminus of SUMO with an epsilon-amino group of a lysine residue of the target protein.

Any process that stops, prevents, or reduces the frequency, rate or extent of DNA endoreduplication.

Any process that activates or increases the rate or extent of progression through the mitotic cell cycle.

Any process that modulates the frequency, rate or extent of meristem development, the biological process whose specific outcome is the progression of the meristem over time, from its formation to the mature structure.

A homeostatic process involved in the maintenance of an internal steady state within the germ-line stem-cell niche. This includes control of cellular proliferation and death and control of metabolic function that allows the niche to continue to function. A gem-line stem-cell niche is an anatomical structure that regulates how germ-line stem-cells are used and saves them from depletion.

Any process that activates or increases the frequency, rate or extent of cytokinin signaling.

A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.