Abstract
‘Kyuri Chukanbohon Nou 5 Go’, a cucumber (Cucumis sativus L.) cultivar with resistance to powdery mildew (Podosphaera xanthii (Castaggne) U. Braun & N. Shishkoff) not only at higher temperatures (above 26°C), but also at relatively cool temperatures (20°C) was bred as potential breeding material. This cultivar is the progeney from crosses among CS-PMR1, ‘Sharp 1’ (Saitama Gensyu Ikuseikai Co. Japan) and ‘Rira’ (Enza Zaden BV, the Netherlands). The resistance to powdery mildew is thought to be controlled by 2 gene pairs, a major ressessive gene and an incompletely dominant gene that enhances the resistance at cooler temperature. Fruits are borne on the main stem and lateral branches. The fruit is relatively small (approximately 60 g) and similar to Beit Alfa type cucumber and has smooth surface without warts or spines. The color of the fruit skin is dark green. The skin is tougher and flesh is slightly softer without bitterness in fruit. Mature fruits are yellowish green with dense netting. This cultivar is a useful breeding material for powdery mildew-resistant cucumber.
