Sing1e or Combined Treatment Effect of Priming, Gibberellin and Prechilling on Germination of Gourd Seeds

The present experiment was done to determine the effect of priming, $GA_3$ and prechilling treatment alone and in their combination on germination of gourd (Lagenaria siceraria Standl.) seeds. Priming using $KNO_3$ and $GA_3$ were treated with different concentrations and periods whereas prechilling was done at only different periods. FR-yongjadaemok and FR-kunghap were used as test cultivars and their daily germination rates were measured at treatment levels. The best germination rate of each treatment was shown in a week prechilling at $3^{\circ}C$, a day priming with 100 mM $KNO_3$ and a day treatment with 0.01 mM $GA_3$ although the prechilling had the highest rate among them. The rate of priming treated after the prechilling was continuously decreased with its longer treatment periods and was less than no-priming. In addition, the rate of $GA_3$ treatment after the prechilling was not affected by its concentrations and treatment periods. Priming and $GA_3$ treatments before the prechilling, however, showed similar germiabilities between their treatment levels including no-treatment. The results mean that sequential order of available presowing treatments is important to enhancing the rate.

현재 수박접목묘로서 가장 많이 이용되고 있는 박 종자의 발아율을 높이기 위하여 Priming, $GA_3$, 저온의 단일처리 효과와 저온처리 전후에 가하여지는 priming과 $GA_3$ 의 복합처리 효과를 조사하였던 바 그 결과를 요약하면 다음 과 같다. $3^{\circ}C$에서 1주간 행하여지는 저온처리, 100 mM $KNO_3$에 1일간 행한 priming, 0.01 mM에 1일간 행한 $GA_3$의 단일처리에 대한 발아율을 조사한 결과 저온처리에서 가장 높게 나타났다. 그러나 발아율은 저온처리 후의 priming 처리는 무처리보다는 낮았고 처리기간이 길어질수록 발아율이 현저히 감소되었다. 저온처리 전에 행한 priming과 $GA_3$ 처리는 저온처리 전의 $GA_3$ 처리에서와 같이 농도와 처리기간에 따른 차이가 없었다. 따라서 박의 종자 발아율 향상을 위한 종자처리로써 여러 개의 단일처리를 조합한 복합처리는 처리조합과 순서에 따라 발아율이 영향을 받는 것으로 사료된다.