| Relationships among carbon isotope discrimination, grain yield and photosynthetic traits of flag leaves in winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2016.01.26 |
| Key Words: winter wheat carbon isotope discrimination grain yield photosynthetic traits stomatal density |
| Author Name | Affiliation | | CHEN Xiao-jie | Key Lab Nucl Agr, Isotope Inst Co Ltd, China Henan Acad Sci, Zhengzhou, Henan 450015, China
State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Jian-wei | Key Lab Nucl Agr, Isotope Inst Co Ltd, China Henan Acad Sci, Zhengzhou, Henan 450015, China | | YANG Bao-an | Key Lab Nucl Agr, Isotope Inst Co Ltd, China Henan Acad Sci, Zhengzhou, Henan 450015, China | | ZHANG Fu-yan | Key Lab Nucl Agr, Isotope Inst Co Ltd, China Henan Acad Sci, Zhengzhou, Henan 450015, China | | CHENG Zhong-jie | Key Lab Nucl Agr, Isotope Inst Co Ltd, China Henan Acad Sci, Zhengzhou, Henan 450015, China | | HU Yin-gang | State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to understand the relationships among carbon isotope discrimination (Δ13C), grain yield and photosynthetic related traits of flag leaf in winter wheat under different water conditions, 12 major winter wheat cultivars were selected as research materials to analyze the relationships among Δ13C, grain yield, photosynthetic traits and stomatal density of flag leaf through a normal and drought treatment experiment. The results showed that the mean values of 5 traits, including photosynthetic rate (Pn), carbon isotope discrimination (Δ13C), stomatal conductance (Gs), SPAD value of the flag leaf chlorophyll content (SPAD) and grain yield (GY), were significantly decreased under water stressed (WS) condition, compared with the well-watered (WW) condition (at least P<0.01). Results of a correlation analysis indicated that stomatal conductance (Gs), transpiration rate (E), intercellular CO2 concentration (Ci) and Ci/Ca were positively correlated at significant levels with each other under two water conditions (at least P<0.05). Δ13C was positively correlated with GY under both water conditions (WS and WW), and higher positive correlation was observed under water-watered condition than WS condition(0.27 WS; 0.51 WW). Δ13C was positively correlated with Pn、Gs、E、Ci and Ci/Ca under water-stressed, significantly positively correlated with Ci/Ca(P＜0.05). Δ13C was obviously negative correlated with Pn under well-watered(-0.42), no significant relationship with other four photosynthetic traits. Δ13C was obviously or significantly negatively correlated with stomatal density of flag leaf (-0.49, -0.21, WS; -0.56, -0.61WW) under two water conditions. Because stomatal density was stable under different water conditions, flag leaf stomatal density may be a potential surrogate markers for Δ13C. The results from this study would provide valuable information for the application of Δ13C in the breeding of drought-resistant and water-saving winter wheat. |
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