Collaborative lodging resistance analysis of maize stalk and root system
In order to systematically analyze the synergistic lodging resistance of maize stems and roots,six maize cultivars with different lodging resistance were selected as the research materials with a planting density of 60 000,75 000,and 90 000 plants/hm2.The stalk pull lodging force(PLF)and angle(PLA)as the lodging resistance evaluation indicators were correlatively analyzed with the morphological characteristics and material accumulation per unit length of the basal third internode and root traits.Simultaneously,a path analysis of basal internode and root traits was conducted.The results showed that the length,diameter,fresh and dry weight per unit length,content of each component per unit length of internode,root plate spread,brace root diameter,total root number,root diameter,and root dry weight were significantly correlated with the evaluation indicators of lodging resistance,among which the diameter(PLF:r=0.561**,PLA:r =0.521**),fresh weight per unit length(PLF:r=0.520**)and dry weight per unit length(PLA:r=0.562**)of internode displayed the greatest correlation.Root traits such as root dry weight and brace root diameter were positively correlated with the diameter and mass accumulation per unit length of basal internode,which synergistically influence lodging resistance of plants.When the planting density increased,the diameter and material accumulation per unit length of internode,structural root depth,brace root diameter,total root number,root diameter and root dry weight significantly decreased,resulting in a significant decrease in the stalk pull lodging force and angle and in lodging rate.The diameter(1.76,1.72,1.71 and 1.70 cm),fresh weight per unit length(2.9,2.7,2.4 and 2.5 g/cm),dry weight per unit length(0.45,0.40,0.35 and 0.45 g/cm)of internode and other traits of internode and root related to lodging resistance were higher of'Lishou1','Chuangyu 107','MC278'and'Jingnongke 728',which was consistent with their larger PLF(18.1,17.1,14.7 and 13.0 N)and PLA(63.3°,56.7°,50.3° and 49.6°).After densification,the variation amplitude of PLF,PLA and traits related to lodging resistance of internode and root were smaller.Therefore,the lodging resistance and density tolerance of these four cultivars were stronger.This study provided a certain theoretical basis for ensuring the high and stable yield of maize and improving the mechanization level.
万方数据
维普
