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Effects of gibberellin, auxin and cytokinin in developing parthenocarpic roselle fruit at different
concentrations under field condition

¹Nor Afifah Abd Rahman, ¹Wan Zaliha Wan Sembok *

1 Faculty of Fisheries and Food Science, Universiti Malaysia Terengganu,
21030 Kuala Nerus, Terengganu, Malaysia.

*Corresponding author: wzaliha@umt.edu.my

Abstract:

Roselle is a non-climacteric fruit that expose to rapid deterioration just after harvested and any delays
in its processing should be avoided. Crop improvement through hybridization is difficult to achieve due
to its cleistogamous condition. Thus, producing parthenocarpic roselle fruit could be the best alternative
in maintaining its quality performances. Parthenocarpy is the formation of fruit without pollination or
fertilization which resulted in seedless fruit that has higher commercial value than seeded fruit. To
produce seedless roselle and maintain its postharvest quality, the application of gibberellins, auxin and
cytokinin at various concentrations were investigated in three different sub-experiments under field
condition. The treatments were 0 mg/L, 200 mg/L, 400 mg/L, 600 mg/L, 800 mg/L and 1000 mg/L of
the above-mentioned plant growth regulators (PGRs) and arranged as according to complete
randomized block design (CRBD) with four replications. Sprayed were done at 35, 45, 55 and 65 days
after transplanting (DAT). The application of various concentrations of gibberellin and cytokinin
produced smaller capsule of seed pot of roselle fruits without any adverse effect on its quality. Among
the treatments, 800 mg/L gibberellin and 200 mg/L cytokinin had the tendency to produce
parthenocarpy roselle fruit by exhibiting the smallest capsule diameter. While the application of auxin
at very high concentration (1000 mg/L) had the probability to produce seedless fruit with slight
detrimental effect on the fresh weight and number of fruit due to early fruit drop. In a conclusion, the
application of different types of PGRs shows a possibility to reduce deterioration in quality of
parthenocarpic roselle fruit.

Keywords: Postharvest, Seedless, Parthenocarpic, Roselle, Plant growth regulators