지베렐린이 신고 배의 비대와 성숙촉진에 미치는 영향 = Effect of the gibberellin treatment on enlargement and mature promotion in Niitaka pear(Pyrus pyryfolia L.)

다국어 초록 (Multilingual Abstract)

The object of this study was to evaluate the effect of the gibberellin treatment on fruit enlargement and ripening promotion in 'Niitaka' pear(Pyrus pyrifolia). Fruit weight was similar between GA4+7 treatments and the gibberellin-paste control, but fairly increased of fruit weight compared to non-treatment. Most effective time for GA4+7 treatment to increase diameter and length was on 35 and 40 days after full bloom, respectively. Shape index was similar in all treatments. Fruit enlargement at the period of early growth, GA4+7 2.4% treatment was remarkably effective than GA3+GA4+7 2.7% treatment or non-treatment. However at the period of maturity, GA4+7 2.4% treatment and GA3+GA4+7 2.7% treatment showed little differences in fruit enlargement and coloring. In maturing promotion effect, young fruit treated with GA3+GA4+7 showed similar fruit coloring to ethephon treatment on 35 days after full bloom, and both of those treatments promoted fruit coloring than non- treatment about 6 days. GA3+GA4+7 treatments resulted higher solid content and decreased acidity than non-treatment. However, there was no differences in fruit hardness comparing to non-treatment. As a result, gibberellin was most effective in fruit enlargement, so as all GA3+GA4+7 treatments were more effective on fruit enlargement than ethephon treatment or non- treatment. Specifically, when GA3+GA4+7 was treated 35days after full bloom of flower, the diameter, the length and the shape of fruit index were best, and fruit coloring was good as well.

국문 초록 (Abstract)

본 실험은 지베렐린이 ‘신고’배 숙기와 비대에 미치는 영향을 조사하기 위하여 실시되었다. 과실중 조사에서 모든 Gibberellic acid A4+7 처리구는 대조구인 지베렐린 도포제와 비등한 약효가 나타났으며, 무처리구에 비해서는 증가를 나타내었다. 횡경은 GA4+7을 만개후 35일째에 도포한 것이, 종경은 만개후 40일째 도포한 것이 가장 효과적인 것으로 나타났으며, 과형지수는 모든 처리구에서 비슷한 수치로 나타났다. ‘신고’배 발달 초기에는 GA4+7 2.4% 처리구가 GA3+GA4+7 2.7% 처리구나 무처리구보다 현저하게 큰 차이로 비대가 되는 것을 볼 수가 있으나, 성숙기에 들어서면 GA4+7 2.4% 처리구와 GA3+GA4+7 2.7% 처리구의 크기와 가시적인 착색도가 거의 비슷해지는 것을 볼 수 있었다. GA3+GA4+7의 성숙촉진 효과를 검토하기 위하여 에테폰 액제와 비교하여 실험한 결과, GA3+GA4+7를 만개후 35일째에 어린 과실에 도포한 것이 에테폰과 비슷한 정도로 착색이 되었으며, 무처리구와 비교했을 때에는 모든 GA3+GA4+7 처리구와 에테폰 처리 모두 착색이 6일정도 빨라 착색속도에 현저한 차이를 보여주었다. 모든 GA3+GA4+7 처리구는 무처리구에 비하여 당도는 증가하고 산도는 감소하였으며, 과실의 경도는 무처리구보다 낮은 것으로 나타났으나 유의한 차이는 없었다. 상기의 결과로 GA3+GA4+7 처리구 모두가 에테폰이나 무처리구보다 과실의 비대에 있어 효과가 큰 것으로 나타났다. 특히 GA3+GA4+7를 만개후 35일째에 처리한 것이 횡경 및 종경, 과형지수 모두 가장 높게 나타났으며 착색 또한 깔끔하게 되어 상품성이 높게 평가되었다.

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