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Self-sterility in angiosperms
Sage and Sampson (pp. 807-816) show that self-sterility in a relictual angiosperm is not due to self-incompatibility reactions that result in self pollen tube rejection at the nucellus, as previously hypothesized. Rather, double fertilization occurs following self-pollination. Mechanisms of self-sterility are discussed in the context of pre-zygotic self-incompatibility reactions in pollen tube transmitting tissue vs. early-acting inbreeding depression.
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