Alar(N-dimethylaminosuccinamic acid, B-Nine)及Gibberellic acid(GA3)對於胡瓜（Cucumis sativus L.）之生長和性形表現之影響

Interative Effects of Alar (B-Nine) and Gibberellic Acid (GA3) on Growth and Sex Expression of Cucumis sativus L.

本研究在溫室栽培“加賀節成”和“刈羽節成”兩種品種胡瓜，分長日照和自然日照處理，以0、2000、4000與6000ppm濃度之Alar和0、100與200ppm濃度之GA，於發芽後第16天處理全株，獲得植株形態及性型表現之反應，使用Alar處理時，株高有顯著之矮化現象，濃度愈高植株愈低，菌數及節間長度亦同時減少及減短。使用GA處理，可促進植株伸長，節數及節間長度亦微增加，但不若Alar之明顯。Alar和GA相互處理區，其株高，節數及節間長度均在Alar和GA單獨處理者之間，而以Alar之效果較GA顯著。Alar處理者莖徑較粗，而GA者較細。研究期間為夏季，玻璃室內溫度常昇高達45℃，因此胡瓜之性型表現未克正常。Alar處理在刈羽品種較易促進著生雌花，而GA在加賀品種易促進著生雄花。

The influence of two plant growth regulators, Alar and Gibberellic acid on the growth and sex expression of cucumber were investigated in the greenhouse. Two cucumber cultivars, Kaga-setsunari and Kariba-setsunari, were treated under long day and natural day length. The concentrations used for Alar were 0, 2000, 4000, 0000ppm GA were 0, 100, 200ppm They were sprayed once on foliage at 16 days after seed germination. The results were summarized as follows: 1. Effects on the development of plants: with high concentration, plants treated with Alar spray showed a marked retardation of plant height, the number of nodes and internode length GA spray showed promotion of plant growth than controled, but it is notremark-able than that of Alar treated. In the combination of Alar and GA, the plant size was between those of GA and Alar treatments. The size of stem was compared in every chemical treatment. The stems of Alar treatments were thicker than that of GA treatments, the stems of. Alar 6000ppm was the largest in thickness and GA l00ppm was the smallest. 2. Effects on sex expression: In the period of investigation, the temperature in greenhouse was above 45℃. The sex expression of cucumber was not normal. Many nodes were not flowered at long day treatment, many male and female flowers were found at natural day treatment in both cultivars. The results suggest that Alar was responsible in Kariba cultivar for promoting female flower development, and GA in Kaga cultivar promoted male flower development. The plant size and sex expression of cucumber with plant growth regulators were discussed from physiological and histological points.