光强对小麦Wx近等基因系光合特性的影响

Effects of Light Intensity on Photosynthetic Characteristics of Wx Near-isogenic Wheat Lines

[目的]为了研究小麦灌浆初期不同光强对近等基因系光合特性的影响。[方法]用引进的糯小麦与宁麦14杂交并利用现代分子标记技术创制的8个Wx近等基因系为试验材料。[结果]8种近等基因系的光合-光响应曲线拟合系数比较好,小麦叶片的净光合速（P_n）、气孔导度（G_s）、蒸腾速率（T_r）变化趋势一致,而胞间CO_2浓度（C_i）与之相反。8种近等基因型小麦光补偿点wxAB〉wxA〉wxABD〉Wildtype〉wxD〉wxB〉wxAD=wxBD。8种近等基因型小麦表观量子效率wxB〉wxD〉wxAD〉Wildtype〉wxBD〉wxA〉wxAB〉wxABD。8种近等基因型小麦处于最适光强下积累有机物的能力Wildtype〉wxAB〉wxD〉wxBD〉wxB〉wxAD〉wxA〉wxABD〉wxAB〉wxABD。8种近等基因型小麦暗呼吸速率wxAB〉wxA〉Wildtype〉wxABD〉wxD〉wxB〉wxBD〉wxAD。[结论]这5种基因型wxB、wxAD、wxA、wxAB、wxABD存在气孔导度与蒸腾速率在随光强的变化有相同的规律。本研究可为小麦高产育种和栽培技术提供参考。

[ Objective] The effects of different light intensity on photosynthetic properties in the early stages of wheat grouting were studied. [ Method] A hybrid of glutinous wheat and ninem-14 and 8 Wx approaches created by modem molecular markers was used as the experimen- tal materials. [ Result] The photosynthetic light response curve of 8 near-isogenic lines was good, the net photosynthesis rate （ Pn ）, stomatal conductance （ G~ ） and transpiration rate （ Tr ） of wheat changed in the same trend, however, the intercellular CO2 concentration （ Ci ） was op- posite. The light compensation points of 8 kinds of Near-isogenic Wheat was wxAB 〉 wxA 〉 wxABD 〉 Wildtype 〉 wxD 〉 wxB 〉 wxAD = wxBD. The apparent quantum yield of 8 kinds of Near-isogenie wheat was that wxB 〉 wxD 〉 wxAD 〉 Wildtype 〉 wxBD 〉 wxA 〉 wxAB 〉 wxABD. The ability of accumulate organic matter in the optimum light intensity of 8 kinds of Near-isogenic wheat was Wildtype 〉 wxAB 〉 wxD 〉 wxBD 〉 wxB 〉 wxAD 〉 wxA 〉 wxABD 〉 wxAB 〉 wxABD. The dark respiration rate of 8 kinds of Near-isogenic wheat was wxAB 〉 wxA 〉 Wildtype 〉 wxABD 〉 wxB 〉 wxD 〉 wxBD 〉 wxAD. [ Conclusion ] The stomatal conductance （ Gs ） and transpiration rate （ Tr ） of wxB, wxAD, wxA, wxAB and wxABD with the Light Intensity had a same trend. This research could provide a reference for wheat yield breeding and cultivation tech- niques.