https://rajpub.com/index.php/jaa KHALSA PUBLICATIONS en-US JOURNAL OF ADVANCES IN AGRICULTURE 2349-0837 <p><a href="http://creativecommons.org/licenses/by/4.0/" rel="license"><img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License" /></a> All articles published in <em>Journal of Advances in Linguistics</em> are licensed under a <a href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.</p> https://rajpub.com/index.php/jaa/article/view/9848 <p>Prolonged tuber dormancy in yam (<em>Dioscorea</em> spp.) is crucial for storage and economic benefits but hinders production and improvement efforts. Understanding dormancy regulation is necessary for genetic manipulation to enhance postharvest management. This study, using tuber meristematic tissues of three yam cultivars – CRI-<em>Ahoɔdenfoɔ</em> (<em>D. alata</em>), <em>Pona</em> and <em>Labreko</em> (<em>D. rotundata</em>) investigated the influence of endogenous gibberellic acid (GA₃) and the enzymes α- and β-amylase on tuber dormancy and sprouting over 90 days of storage. Sprouting occurred at the proximal end of the tubers and coincided with a significant increase in β-amylase activity and maltose levels in the <em>D. rotundata</em> and <em>D. alata</em> cultivars at 60 and 90 days after harvest (DAH), respectively. Starch content decreased during storage. α-Amylase activity increased initially, peaking at 30 DAH, before declining and then rising again during the later storage period. The study established that yam tuber dormancy could be maintained by keeping GA₃ content below a threshold limit of 1.8 mg/g, and restricting β-amylase activity to less than a 2.5-fold increase compared to harvest values. The results suggest that dormancy is regulated by a combination of GA₃ and β-amylase activity in the meristematic layer of tubers, with GA₃ likely inducing α-amylase synthesis for enhanced glucose generation, and β-amylase producing more maltose.</p> Michael Akuamoah BOATENG Esther NSEASOM Philip GHANNEY Jerry AMPOFO-ASIAMA Wilfred SEFAH Francis Osei AMOAKO-ANDOH Copyright (c) 2026 Michael Akuamoah BOATENG, Esther NSEASOM, Philip GHANNEY, Jerry AMPOFO-ASIAMA, Wilfred SEFAH, Francis Osei AMOAKO-ANDOH https://creativecommons.org/licenses/by/4.0 2026-04-04 2026-04-04 17 1 14 10.24297/jaa.v17i.9848