Chief isoflavones present in soybeans includes Genistein, daidzein and glycitein can prevent osteoporosis and possess biological effect on atherosclerosis, chronic inflammatory ailments and sex hormone metabolism and their biological activity1. Moreover, they are anti atherosclerotic, antioxidative, antitumoral, antiestrogenic and can manage dementia2 as well as cancer3. Isoflavone is basically a heterocyclic phenol having much parallel structure to estrogens.
But, concentration of isoflavone in soybean is affected by means of numerous factors including abiotic and biotic factors. The abiotic factors refer to temperature, water shortage and UV light that influence isoflavone in soybean seed4. While the biotic factors include pathogens, wounding as well as interaction of plant microbe which affect isoflavane5. However, the amount of isoflavones in soybeans can be enhanced by introducing biotic or abiotic elicitor which stimulates the phytoalexin production in soybean. It is reported that foliar application of methyl jasmonate amplify the isoflavone content, whereas it reduces by enhancing the level of salicylic acid, Aspergillus niger and Rhizopus oligosporus6.
Accordingly, Yaya Hasanah, Luthfi Aziz Mahmud Siregar and Lisa Mawar7 conducted a research to check the most favorable elicitor to enhance isoflavone content in Anjasmoro and Wilis cultivar of soybean. In this experiment, randomized block design by following two way ANOVA with three factors and three replications. The first factor refers to soybean cultivars. The second factor is foliar application of elicitors consisted of chitosan (1 mg mL–1), methyl jasmonate (0.5 mM) and salicylic acid (0.5 mM), and their affect was examined on these parameters (genistein, daidzein, glycitein and total isoflavones of soybean). While, the third factor includes the time of foliar application of elicitors consisted of V4 (four trifoliate leaves are fully developed) and R3 (early podding).
At the end of this experiment, the tested parameters with application of Chitosan at R3 application were found to be higher in Wilis cultivar as compared to Anjasmoro. Moreover, the elicitor application time of R3 amplified the total isoflavone around 12% in Wilis cultivar and 14% in Anjasmoro cultivar in comparison with application time of V4. Therefore, these findings will definitely assist scientists and farmers regarding type of elicitor and the optimum time for elicitor applications on soybean cultivar.
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17 November, 2019