Effect of the Growth Retardant Ccc on Flowering, Seed Production and Performance of the Progeny of two Lettuce Species

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Abstract
Seed stalk length was reduced and flower formation was delayed in Lactuca P.I. 177418, an unidentified wild lettuce species of Turkish origin and in Lactuca sativa cv. Proeftuin’s Blackpool, by two applications of a 2,000 p.p.m. solution of (2-chloroethyl)-trimethylammonium chloride (CCC) via the roots. The delay in flowering was about fourteen days under long-day conditions and four days in short days. The number of flower heads was increased by CCC treatment in Lactuca P.I. 177418 and decreased in Proeftuin’s Blackpool, but seed yield was always decreased. The mean weight per seed was unaffected by treatment but seed from treated plants contained less endogenous gibberellin, and CCC residues could be detected. Germination of seed from treated plants was slightly delayed as compared with seed from control plants but the former attained a higher percentage germination than the control seed. Subsequent growth of the CCC progenies was less than that of control plants and flowering was delayed as in the parent plants.

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