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玉米穗轴的进化是大刍草tga1基因中一个核苷酸的突变,使大刍草的外壳变小并开裂,产生的种子后代和大刍草天然杂交,便产生我们得到的中间型产物,中间型产物经数代天然自交便出现当今玉米雏型,大刍草的稃壳应该是其果实的果皮,它是由子房壁发育而来,因此玉米的穗轴便是多个子房壁发育的果皮集合体,通过对红白两种穗轴解剖观察,仍能找到大刍草稃壳的印迹,而穗轴的颜色是其颖片的颜色,大刍草产生的中间型是双行排列的聚合体,而现代玉米则是多个双行排列的聚合体的集合体。
The evolution of maize cob is a nucleotide mutation in the tga1 gene of Pachyrhizus so that the shell of Pachyrhizus diminishes and cleaves, resulting in natural crosses between the progeny of the seeds and the Pisaceae, resulting in the intermediate product we obtained, After several generations of intermediate products of natural self-emergence will appear today’s corn embryonic form, herbaceous crustacean should be the fruit of the pericarp, which is developed from the ovary wall, so the cob of corn is a plurality of ovary wall development Of peel aggregates, through the red and white anatomical observation of two cob, can still find the tyrannosaur shell imprinting, and the cob color is the color of its glume, arborvitae produce intermediate type is double row arrangement Of modern aggregates, while modern maize is a collection of multiple, double-row aggregates.