The effects of application of exogenous IAA and GA3 on the physiological activities and quality of Abelmoschus esculentus (Okra) var. Singa 979
2018
Tahir, D. | Azam, H. M. | Nashriyah, M. | Khandaker, M. M. | Rosnah, J.
An experiment was conducted to investigate the effects of growth regulators on growth, yield and the quality of okra. Indole Acetic Acid (IAA) and Gibberellin (GA3) were applied as foliar spray and stem and flower injection at concentrations of 0, 30, 60, 90, and 120 mg/L on okra plants. The results showed that foliar spray of 90 mg/L IAA, increased the number of leaves, number of branches, number of flowers and number of pods. On the other hand, spraying of 90 mg/L GA3 increased stomatal conductance and pod weight of okra, while the highest chlorophyll content was recorded with 60 mg/L GA3. Stem injection of 120 mg/L IAA produced the highest number of leaves, number of branches, number of flowers, number of pods and plant height. Similarly, 120 mg/L GA3 as stem injection increased the number of branches, number of leaves, number of flowers and number of pods and total soluble solids (TSS). Flower injection of IAA at 30 and 90 mg/L increased pod size, pod weight, pod number and TSS content, while seed production was inhibited by 120 mg/L IAA. GA3 used in a 90 mg/L treatment as flower injection increased pod size and TSS content. It is concluded that the application of 120 mg/L IAA and 90 mg/L GA3 increased the growth, development and quality of the okra fruit and stem and that flower injection worked better than foliar spray.
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