Effects of seedling age and paclobutrazol treatment on the growth of melon scion seedlings grafted onto African horned melon rootstock
Melon is an important horticultural crop. Grafting onto resistant rootstock is a common method for solving soil continuous cropping obstacle. African horned melon(Cucumis metuliferus),a species of the genus Cucumis,has high resistance to southern root knot nematodes,but it is not convenient to be grafted as a rootstock since the small stem,and the improved seedling production technique of plants grafted onto african horned melon is lacking. This study investigated the effects of different ages of african horned melon ZM4 rootstock and the application of exogenous paclobutrazol on the growth of grafted melon seedlings,in order to obtain the optimal grafting age and paclobutrazol concentration. The results showed that ZM4 rootstock had the highest plant height,stem diameter,leaf chlorophyll content(SPAD)and grafting speed at the age of three true leaves than at the age of one and two true leaves,the value of scion fresh mass,stem diameter and height of melon grafted onto ZM4 rootstock at the age of three true leaves was the highest among the three ages. The value of height,stem diameter,and leaf chlorophyll content(SPAD)of melon grafted onto ZM4 rootstock spraying with 75 mg·L-1 paclobutrazol was significantly higher than spraying with 0,50,and 100 mg·L-1. In summary,compared with other ages,the age of three true leaves for the african horned melon rootstock can significantly shorten grafting time and enhance the scion growth,in addition,at the age of one true leaf for the african horned melon rootstock,compared with other concentrations,75 mg·L-1 paclobutrazolis spraying can significantly increase stem diameter,which is not only con-venient for the grafting operation,but also enhance scion growth. The above results provide technical parameters for the application of southern root knot nematodes resistant horned melon rootstock in melon grafting.
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