Many shrunken endosperm mutants of barley ( L.) have been described and several of these are known to have lesions in starch biosynthesis genes. Here we confirm that one type of shrunken endosperm mutant, (so called because it was first identified as a high-lysine mutant) has an additional phenotype: as well as shrunken endosperm it also has enlarged embryos. The embryos have a dry weight that is 50-150% larger than normal. Observations of developing embryos suggest that they undergo a form of premature germination and the mature grains show reduced dormancy. In many respects, the phenotype of barley is similar to that of rice mutants (affected in the gene). However, the barley orthologue of is located on a different chromosome from . Together these results suggest that the gene underlying is unlikely to encode a starch biosynthesis protein but rather a protein influencing grain development.
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| http://dx.doi.org/10.1016/j.jcs.2018.04.013 | DOI Listing |
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