Abstract:

For breading the new wheat varieties which have strong resistance to winter and mature normally in Cold Winter Year and solve the problems of freeze injury and late-maturing usually happened in wheat production, we study comparatively the death degree, buried depth of tillering node and heading stage of high hybrid winter wheat generation materials from Hebei Normal University of Science & Technology in 2008-2009 year (warm winter year) and 2009-2010 year (cold winter year). The results showed that the related coefficient between depth of tillering node and death rate in winter was -0.6185, and they were in extremely notable difference, the related coefficient between the death degree and death rate in winter was 0.1635, and they were not in notable difference, and selection method of buried depth of tillering node was superior to the method of death degree, especially in warm winter the death degree had bad reliability. Cold winter year could make heading stage of winter wheat lag behind in different degrees. We compared 2008-2009 year (warm winter year) with 2009-2010 year (cold winter year) and found that the heading stage of wheat in 2009-2010 year was postponed by 7-14 days and make notable differences compared with warm winter year. The bigger differences between them, the more sensitive the temperature and light reaction was, and the smaller and the more slowness. Our research put forward that it is practicable to select and breed new strong winter wheat varieties which is slowness in temperature and light reaction on the basic of using the index of deep buried of tillering node and the D-value of heading stage in cold winter year and warm winter year.