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来自澳大利亚Ｖｉｃｔｏｒｉｃ州的优良小麦育种系ＢＤ１５９，于１９９０年在各试验点表现出了变化范围较大的落粒数值。而标准品种的该数值普遍较高。品种ＢＤ１５９的可变和不可预测性状是来自澳大利亚育种方案的一大批优良品系和亲本原种的特点。具有低落粒数的ＢＤ１５９籽粒样本的α－淀粉酶活性水平得到了提高。α－淀粉酶均匀地分布在籽粒的近侧和远侧．这种α－淀粉酶的分布类型同典型的发芽籽粒中α－淀粉酶活性的剧烈倾斜分布是完全不同的；此外，也缺少籽粒发芽的证据。这表明小麦品种ＢＤ１５９的异常表现同Ｓｐｉｃａ和Ｌｅｒｍａ等小麦品种在后熟期α－淀粉酶的综合性状是不同的。在澳大利亚新南威尔士州北部的Ｎａｒｒａｂｒｉ地区，把小麦植株从大田移栽到冷玻璃室中，直至成熟。这样，就产生了高水平的α－淀粉酶。而同时，生长在大田中的植株上的籽粒具有非常低的α－淀粉酶活性。
The excellent wheat breeding line BD159 from Victoric, Australia, showed a wide range of drop values at various test sites in 1990. The standard varieties of this value is generally higher. The variable and unpredictable traits of cultivar BD159 are characteristic of a large number of elite lines and parental stock from Australian breeding programs. The level of α-amylase activity of BD159 grain samples with low drop number increased. Alpha-amylase is evenly distributed both proximal and distal to the grain. The type of distribution of this alpha-amylase is completely different from that of the typical amylopectin seed; in addition, there is also a lack of evidence of germination of the grain. This indicates that the abnormal performance of wheat cultivar BD159 is different from that of wheat cultivars such as Spica and Lerma at the late ripe stage. In Narrabri, northern New South Wales, Australia, wheat plants were transplanted from the field to a cold glass chamber until maturity. In this way, a high level of alpha-amylase is produced. At the same time, grains grown on plants in the field have very low alpha-amylase activity.