In this study, diploid species Aegilops tauschii, tetraploid species T.durum, hexaploid species T.aestivum and octoploid species Triticale were used as materials and photosynthetic gas exchange parameters, such as chlorophyll concentration, leaf area index etc. were determined at the late developmental stage. The changes of net photosynthetic rate under different illumination, CO2 concentration, temperature and humidity conditions were investigated. Results showed that, the photosynthetic gas exchange parameters and chlorophyll concentration of octoploid material were higher than those of the other three materials and hexaploid material had obvious advantages in leaf area;tetraploid and hexaploid materials had higher light utilization efficiency, while diploid and octoploid materials had stronger resistance to light;hexaploid and octoploid materials had higher utilization efficiency of CO2 and stronger resistance to CO2;the photosynthetic rate of octoploid material was less affected by temperature while diploid and tetraploid materials were more affected by temperature;diploid material had greater influence on humidity, but tetraploid material had less influence on humidity. The changes of hexaploid and octoploid materials on photosynthesis were less under high humidity conditions. Therefore, the growth environment of wheat and related species could be changed according to the change rules of net photosynthetic rate under environmental impact in order to improve the photosynthesis of different wheat evolution materials.
Journal of Triticeae Crops
Gas exchange parameters