Acid Scarification Completes the Germination of <i>Hovenia dulcis</i> Seeds
Seung-Hyuk Yang | Young-Hyun Kwon | Kil-Nam Kang | Seog-Gu Son | Yong-Ha Rhie
Seeds have been reported to have a combination of physical and physiological dormancy. However, this study revealed that <i>H. dulcis</i> seeds only have physical dormancy. The water absorption of the seeds after different periods of sulfuric acid scarification was measured, and the water gap through which water was absorbed after scarification treatment was specified. Cold stratification treatment and gibberellic acid treatment were performed after sulfuric acid scarification to determine whether <i>H. dulcis</i> seeds had physiological dormancy. <i>H. dulcis</i> seeds could absorb water completely when scarified for more than 60 min, and water was absorbed only through the hilar fissure near the micropyle, indicating that <i>H. dulcis</i> seeds have physical dormancy. However, there was no synergistic effect on the final seed germination percentage after the cold stratification or gibberellic acid treatments, and germination was delayed under cold temperature conditions. Thus, it was concluded that <i>H. dulcis</i> seeds have no physiological dormancy but only physical dormancy. This study not only clarifies the kind of dormancy in <i>H. dulcis</i> seeds but also provides a method to expedite seed germination without a long cold stratification treatment period of 2 or 3 months.
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