在掖单13号玉米制种时,要经常鉴别478和340两个自交系,以提高制种纯度.但是这两个自交系在苗期长像有些相似,很不容易鉴别.下面介绍一下它们的不同特点,只要抓住它们的不同点加以区分,是能够鉴别清楚的.478:叶片宽厚,较短,浅绿色,叶脉明显,直立上冲,开张角大;叶毛多而硬,用手触摸有扎手的感觉;较340耐旱. In the Yeda 13 maize seed, we must often identify two inbred lines 478 and 340, in order to improve seed purity, but these two inbred lines at the seedling looks like some are not easy to identify. Their different characteristics, as long as they grasp the difference between them to distinguish, is able to identify clearly .478: leaf generous, short, light green, obvious veins, upright punching, opening angle; leaves more and more hard, Hand touch the feeling of a hand; more drought-resistant 340.