University of Missouri

Variable short internodes

--Gregory G. Doyle

Variable short internodes (vsi) is a recessive mutant that arose spontaneously. Its expression is quite unusual. There are clusters of short internodes generally from 2 to 4 in number which are from 2.5 to 4cm in length. The other internodes are of normal length. These clusters are usually at the base of the plant although they may be found anywhere on the plant. In a few cases two clusters of short internodes were found on the same plant. It is possible that vsi is a temperature sensitive mutant and a minor cold wave in the early spring sets up this phenotypic response.

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