福岡県農業総合試験場研究報告

石坂晃・山本幸彦^１）・月時和隆^２）・満田幸恵^３）
（園芸研究所）

［摘要］国内外のキュウリ14品種を用いて、歯切れ感を簡易に推定する方法を確立し、果重200～350ｇ前後で収穫しても歯切れ感が優れるキュウリ品種を選定した。
１　果重250ｇ程度のキュウリ８品種の果実を用いて、貫入抵抗値および胎座部割合と歯　切れ感との関係を検討した結果、果肉貫入抵抗値が大きく胎座部割合が低い品種が歯切　れ感評点が高かった。歯切れ感評点（Ｙ）は果肉の貫入抵抗値（ｂ，ｇ）および胎座部　割合（ｃ，％）を説明変数とした次式で表された。
　　Ｙ＝0.0151ｂ－0.0192ｃ－2.349
２　雨よけ普通栽培および促成栽培で果重180～350ｇ前後の果実を調査した結果、果肉　貫入抵抗値が大きく胎座部割合が低い品種として、‘ＮＥＶＡＤＡ’および‘ＫＵ－369　’を選定した。

［キーワード：キュウリ、歯切れ感、果肉貫入抵抗値、胎座部、収量］

　Cucumber Cultivars which Excel in Edible Quality and are Suitable for being Harvested Big Size. ISHIZAKA Akira, Yukihiko YAMAMOTO, Kazutaka TSUKIJI, and Yukie MITSUDA (Fukuoka Agricultural Research Center, Chikushino Fukuoka 818-8549, Japan)Bull. Fukuoka Agric. Res. Cent. 19: 41 - 44 (2000)

　Using fourteen foreign and domestic cucumber cultivars ,we established a simple method for estimating edible quality. We selected two superior edible quality cultivars when their fruits were harvested at a weight ranging approximately between 200 and 350g.

1. Using eight cultivars of cucumber fruits which weighed about 250g each, we analyzed the relationship between test scores for edible quality values of flesh puncture force readings and placenta ratios. There is a functional relationship between them. The function is as follows;

where Y is test scores for edible quality, b is flesh puncture force readings(g) and c is the placenta ratio(%).

2. We measured the 200-350g fruits which were harvested both in a normal greenhouse culture and in forcing culture. 'NEVADA' and 'KU-369' were found to have high values for flesh puncture force readings and low placenta ratios.

[Key words: cucumber, edible quality, flesh, puncture force reading, placenta]