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Effect of gibberellic acid and iaa on growth and differentiation of cultured ear inflorescences of maize zea mays l



Effect of gibberellic acid and iaa on growth and differentiation of cultured ear inflorescences of maize zea mays l



Plant Science (Shannon) 68(2): 239-248



In order to explore the involvement of gibberellins and auxins in the development of maize ears, immature ear inflorescences were cultured in defined liquid media containing different concentrations of gibberellic acid (GA3) and indole-3-acetic acid (IAA). The overall growth of the youngest ear primordia (5.1-10.0 mm long) was inhibited by higher concentrations of GA3. A negative relationship between growth and increasing GA3 concentration was demonstrated for young ear primordia. Growth of large ears (10.1-15.0 mm long), however, was stimulated slightly by increasing concentrations of GA3. Except at the lower concentrations of GA3, female flowers overwhelmingly predominated. Growth of older meristems (10.1-15.0 and 15.1-20.0 mm long) was inhibited at higher concentrations of IAA. IAA promoted the maturation of female flowers in the developing ears but to a less consistent degree than GA3.

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Accession: 007248507

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