Genotypes, with significant more rachis nodes, thus more spikelet number per spike than CS (Common Spike) in wheat, are named MRN (Multiple-Rachis-Node) wheat.

• 多穗轴节类(MRN)小麦系指通过增加小穗着生部位(穗轴节)来提高每穗小穗数的遗传类型。