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【期刊论文】A Cryptic Modifier Causing Transient Self-Incompatibility in Arabidopsis thaliana
刘培, Pei Liu, Susan Sherman-Broyles, Mikhail E. Nasrallah, and June B. Nasrallah, *
Current Biology 17, 734-740, April 17, 2007,-0001,():
-1年11月30日
Breakdown of the pollination barrier of self-incompatibility (SI) in older flowers, a phenomenon known as pseudo-self-compatibility or transient SI, has been described as an advantageous reproductive assurance strategy that allows selfing after opportunities for out-crossing have been exhausted [1-9]. Pseudoself-compatibility is quite prevalent as a mixed mating strategy in nature, but the underlying molecular mechanisms are not known. We had previously shown that Arabidopsis thaliana exhibits cryptic natural variation for pseudo-self-compatibility, which is uncovered by transformation of different accessions with SI specificity-determining SRK and SCR genes from its selfincompatible sister species A. lyrata [10, 11]. Here, by using this transgenic A. thaliana model, we show that pseudo-self-compatibility is caused by a hypomorphic allele of PUB8, an S-locus-linked gene encoding a previously uncharacterized ARM repeat-and U box-containing protein that regulates SRK transcript levels. This is the first gene underlying pseudo-selfcompatibility to be identified and the first report in which cryptic natural variation unveiled by a transgene enabled the cloning of a gene for a complex trait.
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