西瓜专用砧木新品种苏砧2号的选育

苏砧2号是以印度南瓜种自交系15S-32为母本,以印度南瓜种自交系15S-27为父本配制而成的南瓜类型西瓜专用砧木一代杂种。该砧木出苗整齐,茎秆青绿、粗壮,髓腔紧实,子叶平展、大小适中,嫁接易操作,嫁接亲和性好、成活率高;高抗西瓜枯萎病,田间对蔓枯病的抗性强于对照京欣砧4号,前期耐寒、后期耐热性突出。嫁接苗生长后期不易早衰。易坐果,增产效果较好,平均达12.3%以上;对果实品质影响较小,能增加果实中心糖含量,综合性状优良。适宜江苏及相似地区春提早保护地西瓜嫁接栽培。

A New Watermelon Rootstock F1 Hybrid —‘Suzhen No.2’

‘Suzhen No.2’ is a F₁ hybrid of pumpkin type watermelon special rootstock，developed by crossing inbred line 15S-32 （Cucurbita maxcima） from India as female parent and 15S-27（Cucurbita maxcima）from India as male parent．This rootstock germinated in order and has light green and thick strong stalk．Its medullar cavity is solid．The cotyledons are open and flat，and of moderate size．It is easy to operate grafting．Its grafting has good compatibility，high survival rate，and high resistance to watermelon Fusarium wilt．In fields，its resistance to vine blight is stronger than that of the contrast‘ Jingxinzhen No.4’．In early stage，it is tolerant to cold and in late stage，its heat tolerance is prominent．The grafted seedlings will not get premature senility in late growth stage．It is easy to set fruit and has better yield increasing effect，averagely over 12.3%．It has less influence on fruit quality，but can increase the central sugar content in fruit．Its comprehensive properties are good．It is suitable for grafted cultivation in early spring in Jiangsu Province and similar areas．