What are self-incompatible plants? Explain with diagram
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Answer:
Self-incompatibility is a mechanism that prevents pollen from one flower from fertilizing other flowers of the same plant. Self-incompatibility is often observed in plants belonging to such families as Solanaceae and Rosaceae. In these plants, self-incompatibility is controlled by a single gene locus with a large number of alleles, the S-locus. In self-incompatible plants, when a pollen grain lands on a style expressing the same S-allele, pollen tube growth is stopped or retarded, and there is no delivery of sperm to the ovary.36 Anderson et al. cloned37 the cDNA encoding the extracellular basic protein associated with S-alleles of Nicotiana alata. McClure et al.7 identified the CAS sequences of RNase T2 in these proteins. They also found that these proteins exhibit RNase activity7 (for a review, see Parry et al.36). Similar S-associated RNases have been found by several groups in many members of Solanaceae and other plants. The roles of S-RNases in self-incompatibility have not been fully elucidated. The importance of RNase activity in rejecting the pollen from the same plant has been discussed.
Answer:
Self-incompatibility is a mechanism that prevents pollen from one flower from fertilizing other flowers of the same plant. Self-incompatibility is often observed in plants belonging to such families as Solanaceae and Rosaceae.
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