Hammer Rivka S, Ben Naim Yariv, Brand Arnon, Cohen Yigal
Faculty of Life Sciences, Bar-Ilan University, Ramat Gan 5290000, Israel.
Genesis Seeds, Ashalim 8500000, Israel.
J Fungi (Basel). 2025 Aug 16;11(8):597. doi: 10.3390/jof11080597.
Downy mildew, caused by the oomycete , is the most destructive foliar disease of cucumbers. While partially resistant slicer cultivars (with spined fruits) are commercially available, no resistant Beit Alpha cultivars (characterized by smooth, dark green fruit) have been developed to date. Here, we report the successful breeding of downy mildew-resistant Beit Alpha cucumber lines. Resistance was transferred from the wild Sikkim cucumber accessions PI 197088 and PI 330628 (characterized by round fruit, with heavily netted brown rind). The resistance and fruit phenotype were restored through backcrosses to elite commercial susceptible cultivars. Due to the recessive nature of the resistance genes and their distribution across multiple chromosomes, the breeding program required multiple backcrosses and stringent selections for both resistance and fruit type.
霜霉病由卵菌引起，是黄瓜最具毁灭性的叶部病害。虽然市场上有部分抗病的切片黄瓜品种（果实带刺），但迄今为止尚未培育出抗病的 Beit Alpha 品种（果实特征为光滑、深绿色）。在此，我们报告了抗霜霉病的 Beit Alpha 黄瓜品系的成功培育。抗性从野生锡金黄瓜种质 PI 197088 和 PI 330628（果实圆形，褐色外皮有大量网纹）转移而来。通过与优良的商业感病品种回交，恢复了抗性和果实表型。由于抗性基因的隐性性质及其分布在多条染色体上，育种计划需要多次回交以及对抗性和果实类型进行严格选择。
