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“Anthocyaninless mutants of Brassica rapa fail to produce anthocyanin pigments (Burdzinski, 1).” The anthocyaninless plants therefore have non-purple stems and are controlled by the recessive allele, anl.
The anthocynanin pigment is extremely important in plants because “the presence of anthocyanins that provide the colour palette for the breeder (Delpech, 207).” The colors produced by the pigment guides the pollinator to the source of the pollen to ensure the process of pollination.
“A given phenotype arises from a genotype that develops within particular environment (Pierce, 46).” The genotype determines the boundaries for development but how the phenotype develops is also determined by other genes and environmental factors.
Several genotypes with the known phenotypes of interest of Brassica rapa are known.
"People who are doing this are sceptical and are not putting all their money on these findings," says Jianhua Zhang, who works on other aspects of ABA at Hong Kong Baptist University. Collecting proteins from plant cells for binding studies is easier said than done, he says, as plant cells are particularly crowded, complex places.
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He was also contacted by Catherine Day of the University of Otago in Dunedin, New Zealand, who could not repeat the work either. According to Hill, his team interpreted an experiment as showing that ABA broke up a binding interaction between the receptor candidate FCA, involved in flowering, and another protein, FY, because ABA bound better to FCA than did FY.
In fact, he says, the FY protein was not properly prepared, and probably never bound to FCA at all.
Brassica rapa yields seeds from the moment it is a seed in about 34 days (Lauffer, 18).
The relatively short life cycle and other model organism traits make Brassica rapa relatively easy to manage in a classroom setting.