Abstract: In order to understand the photosynthetic physiological characteristics and dry matter accumulation of different wheat varieties in Huanghuai area at early growth stage, which could provide basis for screening high photosynthetic breeding parents, Wenmai 6, Zhoumai 18, Aikang 58, Bainong 418 and Bainong 419 were used as experimental materials, the photosynthetic rate, chlorophyll content(SPAD), chlorophyll fluorescence parameters, leaf area index(LAI) and dry matter accumulation and change rules of the early growth period were studied.The result showed that Bainong 419 exhibited strong photosynthetic and physiological characteristics.The SPAD of Bainong 419 in January 10, January 25, February 10, March 1, was respectively higher 2.75%, 3.55%, 1.43% and 20.50% than Wenmai 6;higher 8.76%, 10.82%, 15.80% and 16.44% than Zhoumai 18;higher 14.19%, 16.16%, 2.05% and 13.74% than Aikang 58 and higher 14.67%, 10.63%, 6.01% and 13.55% than Bainong 418.In four measurement periods, the maximum photochemical efficiency(Fv/Fm) and electron transfer rate(ETR)of Bainong 419 were all the highest, significantly higher than Wenmai 6 and were also significantly higher than Zhoumai 18 on January 10, January 15 and February 10;photosynthetic rate was higher 20.75%, 14.08%, 2.91% and 13.40% than that of Wenmai 6;higher 44.49%, 31.67%, 14.96% and 20.10% than Zhoumai 18;higher 76.11%, 28.30%, 9.43%, 17.51% than Aikang 58;higher 49.95%, 82.29%, 31.40% and 20.35% than Bainong 418;LAI was significantly higher than other varieties.The physiological properties of Bainong 419 finally induced more dry matter accumulation at early growth stage.Light photosynthetic physiological characteristics results of different wheat varieties at early growth stage showed that Bainong 419 had the potential as high photosynthetic breeding parent.

Key words: Wheat, Huang-Huai area, Early growing stage, Photosynthetic characteristic, Dry matter accumulation

CLC Number: 

• S512.01