sporophytic self-incompatibility

plant reproduction

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July 14, 2026

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Sporophytic self-incompatibility is a mechanism in plants that prevents self-fertilization. This process is genetically controlled and relies on chemical substances within the plant. When pollen from the same plant lands on the stigma, it may fail to grow or its pollen tube may not develop properly down the style, thus preventing fertilization. This system ensures cross-pollination, which offers evolutionary advantages by increasing genetic diversity in offspring, making the species more adaptable to changing environments. While self-fertilization allows isolated individuals to reproduce and stabilize desirable genetic traits, it limits adaptability. Sporophytic self-incompatibility is not typically found in plants with strong structural or temporal barriers against self-pollination.12

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angiosperm
Pollination
The most common type is sporophytic self-incompatibility, in which the secretions of the stigmatic tissue or the transmitting tissue prevent the germination or growth of incompatible pollen. A second type, gametophytic self-incompatibility, involves the inability of the gametes from the same parent plant to fuse and form a zygote or,…
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The most common type is sporophytic self-incompatibility, in which the secretions of the stigmatic tissue or the transmitting tissue prevent the germination or growth of incompatible pollen. A second type, gametophytic self-incompatibility, involves the inability of the gametes from the same parent plant to fuse and form a zygote or,…
Read More