Compatibility (botany)

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In botany, compatibility and incompatibility are the tolerability or intolerance of the partners during pollination and fertilization .

In particular, incompatibility plays a major role in the plant kingdom: in flowering plants , it often makes self-pollination ineffective. The pollen grains either produce active ingredients themselves (Hordeum example), which cause intolerance, or they get them from dust bags (Cosmos example).

In addition to the incompatibility genes of the pistil of the mother plant, those of the individual pollen grains in the first case (Hordeum example) and those of the anthers of the father plant in the second case determine the success of pollination.

Whether the pollen grain germinates at all depends on the interaction with the scar. If germination occurs , it is decided on the stigma or in the style whether the growth of the pollen tube is encouraged or inhibited, or whether it reaches the ovule at all or according to compatible competition. Even if it arrives at the ovule on time, fertilization can still be prevented in the event of incompatibility.

Under self-incompatibility in plants refers to strategies of seed plants , after pollination, fertilization by their own pollen ( autogamy ) or to prevent genetically similar pollen.