Abstract:

The wheat culm of widely-planted cultivar varieties and promising hybrid wheat was studied with comprehensive analysis through external form, Internal microstructure and physiological characteristic by means of the method of combining with field and laboratory, in order to research wheat lodging resistance, discuss lodging resistance of microscopic structure and physiological characteristics. The results showed that, the lodging index of wheat varieties was smaller, the stem was higher, the gravity center height of stem was declining and the basic internode was shorter and thicker, and the stem wall was thicker, the sectional area was larger. Through microscopic observation that the wheat varieties ‘Bainong AK58’ and ‘Zamai 4’ which were smaller for lodging index, the number of large vascular bundle was more, but the number of small vascular bundle was fewer in stem, the large vascular bundle were 41.8 and 37.7 of every stem, the small vascular bundle were 22.7 and 21.0 of every stem. And for the good varieties of culm quality, ‘Bainong AK58’, ‘Zhoumai 18’ and ‘Zamai 4’, their stem activity were stronger during the late filling, particularly, the stem activity of dwarf variety ‘Bainong AK58’ were 49.33 mg/(g?h), and their stem activity reached significant difference between others. The lodging of ‘Bainong AK58’ and ‘Zamai 4’ were stronger after comprehensive analysis, but the relationship between stem activity and lodging was yet to be proved.