Fowler和de la Roche(1975)根据种植在加拿大的23个普通小麦品种所表现的各种品质等级,求出籽粒硬度和蛋白质含量间相关系数r=0.4。尽管这一相关性在统计上只达到P=0.1的显著水平,但跟一般的经验是相符合的,即硬粒红色春小麦比硬粒红色冬小麦籽粒更硬,蛋白质含量更高,它们依次又比软粒白色冬小麦具有更大的硬度和更高的蛋白质含量。对此,Anderson(1966)等人研究了美国31个小麦品种的34个样本蛋白质 Fowler and de la Roche (1975) found a correlation coefficient of grain hardness and protein content, r = 0.4, based on the quality grades exhibited by 23 common wheat varieties grown in Canada. Although this correlation is statistically significant at a significant level of P = 0.1, it is consistent with the general rule that durum-red spring wheat is harder and more protein-rich than durum-red winter wheat grains, which in turn are, in turn, Soft white wheat has greater hardness and higher protein content. In response, Anderson (1966) et al. Studied 34 sample proteins of 31 U.S. wheat cultivars