REGULATION OF SEED DORMANCY IN CHERIMOYA ( Annona cheromola Mill.)

S. M. M.  Rahman; M.  Yoshida

doi:10.53808/KUS.2002.4.1.0145-L

Authors

S. M. M. Rahman Biotechnology and Genetic Engineering Discipline, Khulna University, Khulna 9208, Bangladesh
M. Yoshida Fruit Science Laboratory. Faculty of Agriculture. Kobe University, Kobe-657-01, Japan

DOI:

https://doi.org/10.53808/KUS.2002.4.1.0145-L

Keywords:

Dormancy; Radical; Testa; Germination; Growth regulators.

Abstract

Exogenously applied growth promoting and inhibiting substances regulated seed dormancy in cherimoya. Growth promoting substances, such as gibberellic acid (GAj) and'or kinetin increased germination percentage; on the other hand, growth-inhibiting substance such as abscisic acid (ABA) induced dormancy. Seeds treated with GAj at the concentration of 104M also enhanced germination. The application of GA3 and/or kinetin antagonized the effect of ABA. Effect of day/night temperature on seed germination also tested, 30°C/25°C and 25°C/20°C showed 80% and 60% germination respectively, on the otherhand no germination was observed at low temperature (20°C/15°C). At the temperature 37<'C/320C, hundred percent radical was protruded but radical tips turned brown and died within a week.

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