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利用普通小麦与华山新麦草（２ｎ＝１４，ＮＮ）杂交与回交产生的七倍体杂种（ＡＡＢＢＤＤＮ，２ｎ＝４９），再与普通小麦回交，即产生单体附加（２ｎ＝４３），当以七倍体作父本时，产生单体附加的频率（２４．２％）高于七倍体作母本的频率（１２．２８％）。单体附加自交产生二体附加的频率为７．１９％。不同附加系的细胞学稳定性有差异，并随着逐代选择而有所提高。
(AABBDDN, 2n = 49) produced by crossbreeding and backcrossing of common wheat and Huashanna new wheat grass (2n = 14, NN) and backcrossed with common wheat (2n = 43) When the heptamer was used as a male parent, the additional frequency of monosomy (24.2%) was higher than that of the heptagon (12.28%). Addition of self-bred monomer produced two additional frequencies of 7.19%. The cytological stability of the various additional lines varies and increases with the generational selection.