硫酸處理對豆薯種子發芽之影響

Effect of Sulfuric Acid Treatment on Seed Germination of Yam-bean Pachyrrhizus erosus (L.) Urban

豆薯種子以針刻傷或硫酸處理皆可促進發芽；硫酸處理濃度須高於45%，時間長於10分鐘才有效果；處理後之種皮會產生褐色凹陷，直徑在0.03至0.1mm之間，且種臍由白色變成褐色。硫酸處理之種子經再乾燥及貯存二個月後仍保有其促進效果。

The use of sulfuric acid or needle nicking as scarification methods were equally effective in increasing germination of yam-bean seeds. Treating yam-bean seeds with 45% sulfuric acid for more than 10 minutes resulted in over 80% germination rate. Brown pitting, 0.03 to 0.1 mm in diameter, appeared on both outer and inner surface of testa and the white remnants of the funicular tissue changed to dark brown color when the seeds were treated with sulfuric acid. Yam-bean seeds that were redryed after sulfuric acid treatment remained in good germination capability for up to two months.