Abstract: Two monosomic alien addition lines 02．17 and 02．39 (2n：15． 14C+1H)were identified among 52 plan ts derived from embryo rescue of an Cucumis allotriploid× cucumber． Diferent from their allotriploid parent， the plan ts have white spine， an d the shape of leaves in 02．17 an d 02．39 was has tate an d palmate respectively．In pollen mother cells (PMCs) of 02．1 7 and 02．39．7 bivalents and 1 univalent were observed at diakinesis and metaphase i．Low frequency (about 4％ 一5％ )of trivalents has also been observed at metaphase JI．At metaphase 11，8 chromosomes went to one pole while 7 to another．R APD analysis indicated these two plants were added with one alien chromosome from C．hystrix．

Key words: Monosomie alien addition lines, Cucumber, Cucumis hystrix