Abstract
The effects of aminoethoxyvinylglycine (AVG),1-aminocyclopropane- 1 -carboxylic acid (ACC), dicycyclohexylammonium sulfate (DCHA) and methylglyoxal bis-(guanylhydrazone) (MGBG) on induction of embryogenic competence from the nucellus of two mango genotypes, ‘Tutehau’ (polyembryonic) and ‘Tommy Atkins’ (monoembryonic), were compared. Induction of embryogenic competence in the explanted nucellus of ‘Tommy Atkins’ was more sensitive to AVG and DCHA than ‘Tutehau’. MGBG had no effect on induction of embryogenic competence of either genotype, and ACC suppressed somatic embryogenesis with both cultivars. Ethylene biosynthesis was greater from explanted ‘Tommy Atkins’ cultures. Reducing ethylene biosynthesis with AVG marginally increased the number of embryogenic cultures of ‘Tutehau’, but completely inhibited somatic embryogenesis in ‘Tommy Atkins’ cultures. Ethylene biosynthesis was stimulated by ACC in nonembryogenic cultures of both genotypes and in ‘Tommy Atkins’ embryogenic cultures, in which ethylene biosynthesis was ca 7 X greater than in ‘Tutegau’ embryogenic cultures. The greater sensitivity of ‘Tommy Atkins’ to the ethylene antagonist, AVG, may be due to its greater sensitivity to disturbance of ethylene biosynthesis and spermidine synthesis.
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