The purple color of the caryopses in common wheat (Triticum aestivum L.) is an example of the countless diversity of the Mother Nature. Red and white caryopses are typical in common wheat. Genotypes with purple caryopses are also described. This coloring is caused by anthocyanins which deposit in the pericarp (purple). The anthocyanins biosynthetic pathway is well described. The key enzyme is chalcone synthase (CHS). It catalyzes the first step. We observed the deposition of anthocyanins in the pericarp, the expression of a chalcone synthase gene and the amount of the major anthocyanin - cyanidin-3-glycoside (pericarp of purple caryopses) and delphinidin 3 gycoside during caryopsis development. Purple pigment deposition was not homogeneous and/or uniform. At first, small isolated spots of purple color were formed and thereafter they expanded. The expression of chalcone synthase mRNA occurred five days before pigment deposition and finished earlier than expected. Amounts of cyanidin-3-glycoside increased continuously. Amounts of these fell at the end of caryopses development probably due to formation of more complex substances, process which is described as copigmentation.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:249376 |
| Date | January 2014 |
| Creators | Trojan, Václav |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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