Abstract
We investigated the effect of infection time of CGMMV on the growth and quality of watermelon and cucumber plants. The effect (damages by CGMMV) was estimated on the watermelon where CGMMV had been inoculated at different growth stages, vegetative (transplanting stage, vegetative growth stage) and reproductive growth stage (fruiting stage and fruit hypertrophy stage). In the case of cucumber, CGMMV was inoculated at transplanting stage and Erst flowering stage, respectively. When watermelon was infected with CGMMV at vegetative growth stage, vine length, internode length, leaf area, and fruit weight of the plants largely decreased compared with control plants, while the infected plant growth was not very different from control plants when it was infected at reproductive growth stage. Brix of the fruit of watermelon also decreased when the plants was infected with the virus earlier than fruiting stage. The occurrence of 'Pisubag', internal discoloration and decomposition of watermelon fruits, tended to be increased as earlier infection time with CGMMV In the case of cucumber infection time with CGMMV did not influence earlier growth of the plants, but did later growth showing that plant height, vine length, internode length, number of leaf, leaf wide, and leaf length of the plants decreased as infection time became to be earlier.
CGMMV의 감염시기가 수박과 오이의 생육 및 품질에 미치는 영향을 조사하였다. 수박은 생육달계별로 영양생장기 (정식기, 경엽신장기 )와 생식생장기 (착과기, 과실비대기)로 구분하여 CGMMV를 접종하였고, 오이는 정식기와 첫 개화기에 각각 접종하여 피해해석을 실시하였다. 수박의 경우, 영양생장기에 감염되면 만장, 절간장, 엽면적, 과중이 크게 감소하였으나 생식생장기부터는 대조구와 완만한 차이를 보였다. 반면에 당도는 착과기 이전에 접종하면 무처리에 비해 낮았으나 과실비대기에 접종하면 큰 차이 가 없었다. 피수박 발생은 감염시기가 빠를수록 증가하는 경향이었다. 오이의 경우 초장은 접종시기별로 큰 차이는 없었으나 만장은 접종시기가 빠를수록 감소하였고 절간장과 엽수, 엾폭, 엽장도 같은 경향이었다.
