Correlation and regression analysis of agronomic traits and micronutrient elements of color wheat

Color wheat has become a research hotspot in biofortified breeding because it is rich in various microelement. Most previous studies focused on the comparative analysis of agronomic traits and microelement selenium, zinc and chromium in a few color wheat varieties, but the related regression analysis of agronomic traits and microelement in color wheat is rarely reported. The field varieties comparison test had set up in October 2021-June 2022 in the Chinese Academy of Sciences Luancheng agricultural ecosystem experimental station, 19 color wheat germplasm resources and 1 control white wheat from huanghuai wheat area was tested, the detection, t test and related and gradually regression analysis on 16 kinds of microelements, and discusses the correlation of color wheat agronomic traits and trace elements. The results showed that the ear length, number of spikes per plant, harvest index and yield per unit area of 19 color wheat germplasm resources varied significantly from that of the control white wheat, among which "Zirui 8" and "Jizimai 2" increased 7.31% and 6.72% more than the control white wheat “Shimai 22”, respectively. The yield per unit area is highly positively correlated with grain weight, and negatively correlated with copper, zinc and silver. The first related path is from strontium→number of spikes per plant→silver→yield per unit area, the second related path is from nickel→cobalt→iron→ vanadium→ear length; the third related path is from manganese→tin→molybdenum→spike grain number→thousands of grains→copper→zinc→yield per unit area. Five traits of vanadium, copper, strontium, plant height and spike grain number jointly determined 83.4% of the yield variation per unit area. These results provide the theoretical basis and technical support for the biofortified breeding of color wheat.