大豆杂种株行世代选择指数的应用研究

A STUDy ON SELECTION INDICES APPLIED TO YIELD IMPROVEMENT IN PLANT-TO-ROW STAGE OF LATER SOYBEAN HYBRID GENERATIONS

本文研究了不同选择指数用于杂种株行产量选择的实际效果。在较低的选择强度下,不包括产量的特殊指数和两种非特殊指数Ⅰ的实际选择效果,均比直接产量选择法好,而两种非特殊指数Ⅱ相应较差。包括产量指数的实际选择效果则低于或近于对应不包括产量的指数。建议应用不包括产量的指数作株行选择,选择强度以较低为宜。各指数的实际进度均不能由理论进度作可靠的预测。

The practical effect of the indices composed of yield and yield components was studied in 1985 and 1986. The results showed that the specific indices were better than direct yield selection(DYS). Among them, I_1, I_6 and I_7 which were not estimated from the selectin-acted population were best. The non-specific index Ⅰ constructed from the pooled variance-covariance matrix (PVCM) of F_4 to F_7 of the two crosses was better than DYS. But the non-specific index Ⅱ from PVCM of hybrid and land cultivar populations in the literature cited was not so good as DYS. However, the realized yield gains of all indices appeared to be not consistent with, even less than the theoretical eXPectation. In the improvement for yield, the indices with yield seemed to be less effective than those without yield. Thus, the indices without yield were recommended to be used in the stage.