Abstract: The transition-type wheat varieties of Henan province were sown in Beijing, Zhengzhou and Guiyang during the two experimental years of 1988-1990. The results showed that the whole growing periods (days between sowing and maturity) shortened gradually in order of the locations from north to south. There existed very significant differences in the days of the growing period among different geographical locations,and the days were found to have a significantly positive correlation with those from sowing to physiological elongation. The physiological phases of sowing-elongation,elongation-heading and heading-maturity indicated a " long-short-short" feature in Beijing and Zhengzhou but a " short-long-short" feature in Guiyang. These transition-type wheat varieties had no strict requirement on daylength from sowing-heading. However, sowing-elongation and elongation-heading phases were both affected by temperature-light interactions. Negative correlations were very significant between the numbers of days and the "average light-temperature product". Under optimal range of temperature, the days between heading and maturity also showed a very significantly negative correlation with average daily temperature.

Key words: Transition-type wheat varieties, Growth and development, Temperature-light reaction