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Effects of 2‐Chloroethylphosphonic Acid and Gibberellic Acid on Sex Expression and Growth of Pumpkins
Author(s) -
Splittstoesser Walter E.
Publication year - 1970
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1970.tb06471.x
Subject(s) - gibberellic acid , plant stem , biology , horticulture , botany , ethephon , fruit set , biochemistry , germination , ethylene , pollen , pollination , catalysis
Treatment of pumpkin plants with 2‐chloroethylphosphonic acid (CEPHA) induced a greater production of female flowers, shorter internodes and earlier fruit set while treatment with gibberellic acid (GA) induced a greater production of male flowers, longer internodes and later fruit set. Although CEPHA induced the production of a greater number of female flowers, the bulk of the flowers aborted and only a slight increase in the number of fruits per pumpkin plant occurred. The addition of equal concentrations of CEPHA and GA resulted in pumpkin plants with longer internodes and a greater number of female flowers than the untreated plants, although GA partially overcame the effect of CEPHA. The mode of action of CEPHA and GA on sex expression is discussed.