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一个小麦良种的小穗,在穗轴上都有一定的着生密度,例如郑引1号是2.7(即平均每厘米穗长着生2.7个小穗),7023是2.4。良种的退化除表现在植株高低参差不齐、千粒重降低,籽粒大小不匀、抗病能力衰退等方面外,在穗部性状上,往往小穗着生变稀,密度下降,使穗子变小、变形,生产能力降低。例如阿勃,1965年刚在我区大面积推广时,小穗密度为2.3—2.5,到1975年已下降到1.9—2.0;郑引1号原种小穗密度为2.7,这几年有的已降到2.1—2.3。因此,在小麦原种生产过程中,对所选材料认真考察其小穗着生密度是很有必要的。
A spikelet of a wheat seed has a certain density of stamina on the cob, for example, Zheng No. 1 is 2.7 (ie, an average of 2.7 spikelets per cm of ear) and 7023 is 2.4. In addition to the degradation of the elite in the performance of the plant uneven, reduced grain weight, uneven grain size, disease resistance decline, etc., in the ear traits, spikelets often thinning, density decreased, the ear smaller, deformation , Reduced production capacity. For example, abercrombie and fitch, in 1965 just a large area in our promotion, the spikelet density of 2.3-2.5, to 1975 has dropped to 1.9-2.0; Zheng cited No. 1 spikelet density of 2.7 species in recent years Has dropped to 2.1-2.3. Therefore, it is necessary to carefully examine the spikelet birth density of the selected materials during the production of the original wheat.