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The separate roles of ethylene and gibberellins on seed germination have not been clearly established. This has limited full utilisation of these hormones in barley malting. This study was carried out to investigate the roles of gibberellins and ethylene on the germination physiology of ‘Puma’ barley seeds. Germination curves, percent germination, rootlets length and respiration rates of seeds treated with ethylene, 1-methylcyclopropane (1-MCP), gibberellic acid (GA3), daminozide (B-nine), GA3 + ethylene, GA3 + 1-MCP, ethylene + B-nine, 1-MCP + B-nine and the control were compared after 24, 48 and 72 h from soaking, respectively. GA3 and ethylene treatments were used to investigate the effects of increasing endogenous ethylene and GA3 levels, respectively. B-nine and 1-MCP treatments were used to assess the effects of inhibiting gibberellins synthesis and ethylene perception, respectively. Combination treatments were used to assess hormonal interactions. GA3 and ethylene treatments suppressed germination after 24 h, but, had no effect after 48 and 72 h, respectively. B-nine, ethylene + B-nine and 1-MCP + B-nine suppressed germination, rootlet elongation and respiration after 24, 48 and 72 h, respectively. 1-MCP and GA3 + 1-MCP stimulated germination after 24 h, but, had no effect after 48 and 72 h, respectively. GA3 + ethylene treatment suppressed germination and rootlet elongation but stimulated respiration after 24 h. Ethylene suppressed rootlets elongation after 24, 48 and 72 h from soaking, respectively. GA appeared to be the dominant germination hormone, and ethylene, to regulate the rate of germination through suppression of rootlets elongation.

The Roles of Gibberellins and Ethylene on the Germination Physiology of the Malting Barley, Variety Puma (Hordeum valgare cv Puma)