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作物学报 ›› 2008, Vol. 34 ›› Issue (12): 2196-2201.doi: 10.3724/SP.J.1006.2008.02196

• 耕作栽培·生理生化 • 上一篇    下一篇

强光高温同时作用下不同小麦品种的光合特性

齐学礼1,2;胡琳2;董海滨2;张磊2;王根松2;高崇2;许为钢2,*   

  1. 1 南京农业大学作物遗传与种质创新国家重点实验室，江苏南京210095；2 河南省农业科学院小麦研究中心，河南郑州450002
  • 收稿日期:2008-03-04 修回日期:2008-05-28 出版日期:2008-12-12 网络出版日期:2008-09-06
  • 通讯作者: 许为钢
  • 作者简介:齐学礼(1982-),男,河北晋州人,在读硕士,主要从事小麦遗传育种研究.
  • 基金资助:

    国家高技术研究发展计划(863计划)项目(2006AA10Z1F5);国家科技支撑计划项目(2006BAD01A02);河南省重大科技专项(0520010101);农业部现代农业技术体系建设专项

Characteristics of Photosynthesis in Different Wheat Cultivars under High Light Intensity and High Temperature Stresses

QI Xue-Li12,HU Lin2,DONG Hai-Bin2,ZHANG Lei2,WANG Gen-Song2,GAO Chong2, XU Wei-Gang2*   

  1. 1 National Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, Jiangsu; 2 Wheat Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450002, Henan, China
  • Received:2008-03-04 Revised:2008-05-28 Published:2008-12-12 Published online:2008-09-06
  • Contact: XU Wei-Gang

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1965

被引次数

85

摘要：

以小麦品种藁城8901、豫麦49、郑麦9405、周18为试材，用强光(1 900 μmol m-2 s-1)、高温(35℃)同时处理材料3 h，研究了高光强和高温共同合胁迫对小麦旗叶光合作用和叶绿素荧光特性的影响。结果表明，正常生长条件下，郑麦9405和周18的光饱和速率、饱和光强均高于藁城8901和豫麦49，郑麦9405的表观量子效率也最高。强光高温处理使藁城8901、豫麦49和周18的光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)较对照大幅下降；郑麦9405的Pn、Gs也出现了下降，但降幅最小，Pn仍保持11.6 μmol CO2 m-2 s-1，Tr较对照略有上升；4种基因型小麦的Ci未较对照明显变化；与对照相比，4个材料的最大光量子效率(Fv/Fm)、开放的光系统II反应中心的激发能捕获效率(Fv’/Fm’)、作用光下光系统II的实际量子效率(ФPSII)、光化学猝灭系数(qP)均下降，而非光化学猝灭系数(NPQ)大幅上升；其中郑麦9405的各项荧光参数均较高。研究表明，小麦旗叶对强光高温的适应性存在品种间差异，郑麦9405的耐强光高温特性优于其他3品种；强光高温下较高的蒸腾速率和较大的NPQ可能是郑麦9405维持光合机构功能的重要原因。

关键词: 小麦, 高光强高温, 光合作用, 叶绿素荧光

Abstract:

High light associated with high temperature has strong effects on photosynthesis in wheat (Triticum aestivum L.) and results in grain yield loss at maturity. To explore the photosynthetic responses of different wheat cultivars to high light and high temperature (HLHT), we measured the photosynthetic and chlorophyll fluorescence characteristics of flag leaves of four cultivars under the high light intensity of 1 900 μmol m-2 s-1 and high temperature of 35ºC. Under natural groth condition (control), both photosynthetic rate under saturated light and saturated light intensity for photosynthesis in Zhengmai 9405 and Zhou 18 were higher than those in Gaocheng 8901 and Yumai 49, and the apparent quantum yield of Zhengmai 9405 was the maximal among the four cultivars. Compared with the control, after the HLHT treatment, the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) in Gaocheng 8901, Yumai 49 and Zhou 18 were significantly reduced, whereas these parameters changed slightly in Zhengmai 9405 with a rather steady Pn value of 11.6 μmol CO2 m-2 s-1 in flag leaves. In the four cultivars, the intercellular CO2 concentration (Ci) showed no significant changes compared with the control, the maximum photochemical efficiency (Fv/Fm), the efficiency of open centers of photosystem II (Fv’/Fm’), the actual photochemical efficiency of photosystem II (ФPSII), and the photochemical quenching (qP) decreased while non-photochemical quenching (NPQ) increased significantly, and each of the five chlorophyll fluorescence parameters in Zhengmai 9405 was the highest. The results mentioned above indicated that different cultivars had notable differences in the adaptability to high light intensity and high temperature, Zhengmai 9405 was more adaptable than Gaocheng 8901, Yumai 49, and Zhou 18. The higher Tr and NPQ of Zhengmai 9405 may be one of the reasons for its higher photosynthesis rate.

Key words: Wheat, High temperature and High light intensity, Photosynthesis, Chlorophyll fluorescence

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