一般西瓜的叶片为缺裂叶,板叶西瓜叶片却无缺裂,这里一个很有用的性状。因为当板叶西瓜和缺裂叶西瓜杂交时,其后代表现为缺裂叶,卽板叶呈隐性,缺裂叶呈显性。在杂种优势利用中,我们可以利用此特性作为杂种一代的遗传标志,在田间区分杂种与非杂种植株。例如,当我们生产杂种种子时,如以板叶西瓜作母本,以普通缺裂叶为父本,那么杂种一代幼苗植株自第三片真叶起均呈缺裂叶,我们可以通过间苗来剔除非杂种苗, General watermelon leaves are missing leaves, leaf watermelon leaves without cracks, here is a very useful trait. Because when the leaf watermelon and the lack of watermelon hybrids, their offspring is the lack of cracked leaves, leaves are hidden, leaf is dominant. In heterosis utilization, we can use this trait as a genetic marker for hybrids to distinguish between hybrid and non-hybrid plants in the field. For example, when we produce hybrid seeds, such as leaf watermelon as a female parent, the common fissure leaf as a male parent, then the hybrid seedlings plants from the third true leaf were cracked leaves, we can seedlings to Excluding non-hybrid seedlings,