The studies all used biochemical techniques to identify the receptor, rather than the more usual method of identifying and cloning mutated genes before determining if they coded for a receptor.
"There was nothing really wrong with the paper; you couldn't say 'this gel isn't any good'," says Peter Mc Court, an ABA specialist at the University of Toronto, Canada.
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.
The retraction is a setback in the search to find receptors for ABA, a notoriously difficult task.
ABA responds to environmental stresses such as drought, and is an alluring target for agricultural companies hoping to produce drought-resistant crops.However, with a short life cycle, manageable progeny, and adaptability to laboratory conditions, Brassica rapa serves as a good model organism to study transmission genetics.By examining the phenotypes of Brassica rapa to determine the possible genotypes of the plants, Gregor Mendel’s basic principles of heredity of transmission of genetics from parent to offspring are being studied.Another experiment purporting to show direct binding between FCA and ABA was miscalculated and, says Hill, "the assay procedure is also suspect".Some plant-hormone specialists had wondered about the results of this and the other papers from the beginning, as they did not fit with the rest of what was known about ABA.In addition to the color of the stem, the trichomes on the plants are another characteristic controlled by genes.The presence of hair is most notably present on the upper portion of the stem and on the leaves.The stems of Brassica rapa may be purple or non-purple.The purple color results from the pigment anthocyanin and is a controlled by the dominant allele, ANL.However, there are setbacks in using Brassica rapa, including parthenogenesis where there is a production of viable seeds without a male parent to contribute pollen.This serves as a possible problem in analyzing the offspring because the progeny will have characteristics identical to the female parent.