Photosynthetica 2017, 55(3):454-466 | DOI: 10.1007/s11099-016-0659-y

Photosynthetic response of tetraploid and hexaploid wheat to water stress

Y. P. Li1, Y. Y. Li1, D. Y. Li1, S. W. Wang2, S. Q. Zhang1,2,*
1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi, China
2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China

Photosynthetic characteristics of ear and flag leaves of wheat species, tetraploid Triticum dicoccoides Kom and hexaploid Bima1, were studied in plants grown under well-watered (WW) and water-stressed (WS) conditions. Compared to ears, flag leaves exhibited higher photosynthetic rate (P N) at the filling stage, but more severe decrease under WS. P N in the tetraploid wheat ear remained higher than that in the hexaploid wheat during the grain-filling stage. Water stress decreased PN in both the organs; this decline was caused by a reduction in Rubisco activity, not by drought-induced stomatal limitation. Tetraploid wheat ears exhibited higher relative water content and water-use efficiency than that of hexaploid wheat, under WS. The change in phosphoenolpyruvate carboxylase activity and carbon isotope composition indicated the absence of C4 metabolism in the ears of both species under both conditions. The improved performance of the tetraploid wheat ears under WS was associated with better water relations.

Additional key words: carbon isotope; ear photosynthesis; enzyme activity; water relations

Received: January 18, 2016; Accepted: August 19, 2016; Published: September 1, 2017  Show citation

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Li, Y.P., Li, Y.Y., Li, D.Y., Wang, S.W., & Zhang, S.Q. (2017). Photosynthetic response of tetraploid and hexaploid wheat to water stress. Photosynthetica, 55(3), 454-466. doi: 10.1007/s11099-016-0659-y
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