Abstract
Summary Pea seedlings homozygous for the mutant creep gene initially grew in an upright but significantly off-vertical orientation which became progressively more horizontal as growth continued. When the weak lower internodes were supported by staking in a vertical orientation, the subsequently produced internodes of creep plants rapidly became prostrate, in contrast to the internodes of normal plants, which continued in vertical growth. Etiolated creep seedlings, however, showed normal vertical growth. Microscopic examination revealed that stems of the creep mutant possessed a starch sheath with a normal content of amyloplasts sedimented according to the direction of gravity.
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