| As a special plant type, the erect plant type of wheat is characterized by upright tillering growth, tight canopy, large inter-row gaps in conventional row spacing planting, and large spike capacity in the wheat canopy. If the sowing rate increased and the row spacing reduced, wheat yield can be improved. Therefore, it is necessary to explore the unique agronomic characteristics of this type of wheat germplasm under dense planting conditions. In this study, 15 wheat lines with erect plant type derived from different parents were used as experimental materials. The wheat lines were planted under two higher planting densities. Nine main agronomic characters were investigated and the density tolerance coefficients(DTC) was calculated. DTC of the nine agronomic traits were transformed into comprehensive indicators through principal component analysis and the comprehensive density tolerance evaluation value D was calculated to evaluate the density tolerance of the erect plant type wheat. A mathematical model was established using stepwise regression analysis method, and suitable density identification indicators were screened. The results showed that under appropriate high planting density conditions, erect plant type wheat achieved higher grain yields. The cumulative contribution rate of three comprehensive indicators was 85.24%. Based on D value clustering analysis, 15 materials can be divided into extremely strong, strong, moderate, and weak tolerant lines to planting density. Six core evaluation traits, including fresh weight(X7), thousand grains weight(X4), lodging degree(X9), number of ears per hectare(X2), plant height(X5), and mechanical strength(X8) were screened as indices to identify the planting density tolerance of erect plant wheat. The mathematical model for evaluating the planting density tolerance of upright wheat is D=4.330X7+8.838X4-0.325X9+0.463X2+4.501X5+2.092X8-18.499, with an estimation accuracy of over 89.20%. |
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