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“Above ground, meristematic tissue can turn into buds and shoots, but it’s also capable of turning into roots,” Erler says.

Magnus has shown that Peronospora parasitica can only infect meristematic tissues, and that when it co-exists with Cystopus on Capsella, as is usually the case, it enters the latter plant by infecting the gall-like pustules of hypertrophied tissue induced by that parasite.

It has been recently shown that several cambium-zones may remain in a state of activity, so that the formation of a new cambium does not necessarily mark a cessation of growth in the more internal meristematic rings.

The formation of well developed or solid kernels that completely fill the cavity within the shell is dependent upon meristematic activity continuing almost to maturity.