Correlation and grey association analysis of main agronomic traits and yield of new field wheat strains in Yunnan

【Objective】The study aimed to determine the main agronomic traits of new field wheat strains in Yunnan on yield， and to provide reference for the improvement of wheat varieties and the breeding of high-yield varieties in Yunnan. 【Method】In this study， 17 wheat strains that were newly selected and bred in Yunnan and were suitable for the field wheat cultivation model were selected as experimental materials. The method of correlation and grey association were used to analyze the relationship between 8 main agronomic traits and yield of these experimental materials.【Result】There were some differences in theoretical yield， actual yield， and 8 agronomic traits among the 17 new field wheat strains tested. Among them， Yunmai 114， Yunmai 117， Dian 20-982， De 177， Chumai 18， and Bao 2021-6 showed better actual yield performance and great differences compared to other varieties. The correlation analysis showed that there was extremely significant positive correlation between the actual yield and the theoretical yield of new field wheat strains in Yunnan （r=0.732）（P＜0.01， the same below）， positively correlated with basic seedling， maximum tiller numbers， effective spike， grain number per spike and 1000-grain weight， and negatively correlated with growth period， spike rate，and plant height and the correlation was not significant（P＞0.05， the same below）. At the same time， there was extremely significant positive correlation between theoretical yield and the grain number per spike（r=0.629）. The gray association analysis showed that the grey association value between the 8 main agronomic traits and actual yield of new field wheat strains was as follows：grain number per spike（0.6788）＞basic seedling（0.6555）＞maximum tiller number（0.6511）＞effective spikes （0.6465） ＞1000-grain weight（0.6459） ＞spike rate（0.6286） ＞plant height（0.5882） ＞ growth period（0.5715）. Grain number per spike， basic seedlings， maximum tillers and effective spikes were the main factors affecting the yield of new wheat strains in Yunnan， especially grain number per spike.【Conclusion】In the breeding of field wheat varieties in Yunnan， breeders should pay attention to the improvement of grain number per spike and effective spikes among the three factors of yield， and pay attention to the improvement of tillering ability of varieties among other agronomic traits.