Abstract
This experiment was conducted to determine the effect of priming duration and temperature on germinability of vegetable seeds. Priming chemicals were -0.50 MPa PEG 8000 for carrot, 50 mM $K_3PO_4$ for lettuce, 200 mM $KH_2PO_4$ for onion, and 100 mM $Ca(NO_3)_2$ for Welsh onion seeds. Priming temperature varied from $10^{\circ}C$ to $25^{\circ}C$, and priming duration varied from 12 hours to 5 days depending on crops. Percent germination of carrot seeds was significantly affected by the seed treatment and priming temperature. Priming at $20^{\circ}C$ for 3 days was most effective in reducing number of days to attain 50% of the final germination percentage (T50) and mean number of days to germination (MDG). Radicle protrusion in the priming solution was as high as 14% when primed at $20^{\circ}C$ for 4 days. Percent germination of lettuce seeds was affected significantly by the seed treatment and priming duration. Priming lettuce seeds at $20^{\circ}C$ for 2 days increased percent germination and shortened T50 and MDG without radicle protrusion. Percent germination of onion seeds was affected significantly by the seed treatment, priming duration, and temperature. Priming at either $10^{\circ}C$ or $15^{\circ}C$ for 3, 4, or 5 days did not affect percent germination of onion seeds, but was effective in reducing T50 and MDG. Decline in percent germination of onion seeds was precipitous as the length of priming duration increased from 3 to 5 days. Percent germination of welsh onion seeds was not affected by the priming duration and temperature. Priming at $15^{\circ}C$ for 4 days was most effective in reducing T50 and MDG, increased in duration of priming at $15^{\circ}C$ or $20^{\circ}C$ increased radicle protrusion.
Priming시 처리기간과 처리온도가 종자의 발아성에 미치는 효과를 구명하고자 하였다. 이때 사용한 약제는 당근은 -0.50MPa PEG 8000, 상추는 50mM $K_3PO_4$, 양파는200mM $KH_2PO_4$, 파는 100 mM $Ca(NO_3)_2$였으며, 작물별로 처리기간은 12시간에서 5일, 처리온도는 $10^{\circ}C$에서 $25^{\circ}C$까지로 달리하였다. 당근의 발아율은 종자처리와 처리온도에 따른 유의차가 있었으며, $20^{\circ}C$에서 3일 priming시 T50 및 MDG 단축에 효과적이었다. 그리고 $20^{\circ}C$에서 4일처리시 priming 용액속에 유근이 14% 돌출되었다. 상추의 발아율은 종자처리와 처리기간에 따라 유의차가 있었다. $20^{\circ}C$에서 2일 priming시 발아율이 높고 T50과 MDG 단축에 효과적이었으며 유근돌출은 발생하지 않았다. 양파의 발아율은 종자처리, 처리기간 및 처리온도 모두에서 유의차가 있었다. $10^{\circ}C$ 혹은 $15^{\circ}C$에서 3일, 4일 및 5일 처리시 발아율은 향상되지 않았으나 T50과 MDG 단축에는 효과적이었으나, priming 기간이 3일에서 5일로 길어질수록 발아율은 낮아졌다. 파의 발아율은 처리기간 및 처리온도에 따른 유의차가 없었지만, $15^{\circ}C$에서 4일 처리시 T50 및 MDG 단축에 효과적이었고 $15^{\circ}C$ 혹은 $20^{\circ}C$에서 처리기간이 길어질수록 유근돌출이 많이 발생되었다.
(Dept. of Horticulture, Gyeongsang Nat’l. Univ.)