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1982年,在一个混杂食用型品种的自交三代株系中,发现一株花粉粒和雌蕊柱头均为银白色的特殊类型突变体,为保持这一特性,进行了自交。1983年选株姊妹交,又经
In 1982, a self-cross was found in a self-bred third-generation strain of mixed edible cultivars. A special type of mutant with pollen grains and pistil stigma were all silver-white. Selected strains of siblings in 1983, again