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오수옥,이상현,조정안,김영,김월수 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
This study was conducted to investigate the effect of bourse shoots on the fruit growth and development, mineral content and quality of apples. Three hundred bourse shoots bearing fruits were selected from 10 trees randomly in the experimental orchard of Chonnam National University, Naju, Southwestern Korea. Bourse shoot length and fruit diameter were measured at twice on July 20 and August 20 of 2001. Harvested fruits were divided into 6 groups according to bourse shoot length; 0㎝, 11 to 20㎝, 21 to 30㎝, 31 to 40㎝, and longer than 41㎝. Fruit characteristics such as (soluble solid content, flesh firmness and acidity) were measures just after the harvest. The contents of Ca, Mg and K were analyzed of fruit peel, flesh and core tissues. Most bourse shoots stopped growing after late June, while water-sprouting shoots stopped after late July. Results showed that fruit L/D ratio was higher when bourse shoots were 31 to 40㎝ in length. Especially soluble solid content and fruit firmness were higher in the fruits of bourse shoot 21 to 30㎝ in length. Calcium contents of the fruits also were higher in flesh and skin tissues when length of bourse shoots was 21 to 30㎝, while no significant differences were observed in other mineral contents.
pH와 온도가 배(Pyrus pyrifolia)의 화분발아와 화분관신장에 미치는 영향
이상현,오수옥,김월수 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
During blooming period, low temperature caused fruit set to significantly decrease in pear in terms of poor pollination and fertilization. This study was carried out to determine that pollen germination and pollen tube growth could be affected by the conditions of temperature and pH. Dehydrated pollen grains of 'Chuhwang' pear were cultured for 2 hours at various temperature settings (15, 20, 25 and 30℃) and pH levels (4.0, 4.5, 5.0, 5.5, 6.0 and 6.5). At least 300 pollen grains were counted from 10 to 20 random microscopic fields. A pollen grain was considered germination if pollen tube length was greater was greater than the diameter of the pollen grain. Similarly, 100 to 200 pollen tubes were measured with an Image Analyser(IMT, Korea) to calculate mean pollen tube length. Buddings refer to pollen grains where pollen tubes do not grow longer than the diameter of pollen grain. Incubation temperature was maintained at 20±1℃. Each combination/treatment was replicated 5 times. Pollen germination and tube growth investigated by Image Analyser were the highest at 25℃ and pH 6.0 in vitro. However pollen germiantion and tube growth gradually decreased at lower pH. Pollen grains cultured at 15℃ resulted in low germination rate than those at other temperature settings. Especially pollen tubes were abnormally thinned and curved when cultured at 30℃. Therefore, optimum conditions should be maintained during blooming and pollination time in pears since pollen germination and pollen tube growth are very sensitive to low pH and/or high temperature.