丛枝真菌对镉胁迫小麦光合系统的调节作用

摘要

为了探究丛枝真菌对镉(Cd) 胁迫下小麦光合系统的调节作用,采用土培试验,以小麦(Triticum aestivum L.) 百农207和摩西球囊霉菌(Glomus mosseae GS) 为材料,研究了Cd胁迫下接种丛枝真菌对小麦叶片光合速率、气孔导度、蒸腾速率、胞间CO2浓度、叶绿素荧光参数、叶绿素含量、微量元素铁(Fe) 、镁(Mg) 、锌(Zn) 和镉(Cd) 含量的影响.结果表明,接种丛枝真菌的小麦在5 mg·kg - 1Cd胁迫下较未接种小麦,其光合速率、蒸腾速率和气孔导度分别升高了11. 16％、21. 76％ 和14％,光化学最大效率和叶绿素含量分别升高了5. 56％ 和6. 56％,Fe、Mg和Zn含量分别升高了6. 63％、20％ 和4. 29％,Cd含量和胞间CO2浓度分别降低了18. 50％ 和17. 62％; 10 mg·kg - 1Cd胁迫时,光合速率、蒸腾速率和气孔导度分别升高了28. 65％、41. 25％ 和50％,光化学最大效率和叶绿素含量分别升高了1. 43％和15. 33％,Fe、Mg和Zn含量分别升高了7. 81％、30. 77％和9. 74％, Cd含量和胞间CO2浓度分别降低了32. 20％和6. 45％.因此,接种丛枝真菌可以缓解Cd胁迫以及提高小麦叶绿素含量从而增强光合作用.%To investigate the regulation of arbuscular mycorrhizal fungi (AMF) on photosynthesis of wheat under cadmium (Cd) stress,the pot-experiment was carried out with wheat (Triticum aestivum L.) bainong 207 and Glomus mosseae (GS) as materials. Effects of arbuscular mycorrhizal fungi on photosynthetic rate,conductance to H2O,transpiration rate,intercellular CO2 concentration,chlorophyll fluorescence,chlorophyll contents,trace element iron (Fe) ,magnesium (Mg) ,zinc (Zn) and cadmium(Cd) contents in wheat leaves were studied under Cd stress. The results showed that the photosynthetic rate,transpiration rate,conductance to H2O were increased by 11. 16％,21. 76％ and 14％,chlorophyll fluorescence,chlorophyll content increased 5. 56％ and 6. 56％,Fe,Mg and Zn contents increased 6. 63％,20％ and 4. 29％,the content of Cd and intercellular CO2 concentration decreased 18. 50％ and 17. 62％ under 5 mg·kg - 1 Cd stress,respectively. Under 10 mg·kg - 1 Cd stress,the photosynthetic rate,transpiration rate,conductance to H2O were increased by 28. 65％, 41. 25％ and 50％; chlorophyll fluorescence,chlorophyll content were increased by 1. 43％ and 15. 33％; Fe,Mg and Zn contents by increased were 7. 81％,30. 77％ and 9. 74％,but the content of Cd and intercellular CO2 concentration decreased 32. 20％ and 6. 45％,respectively. Therefore, inoculation of AMF could alleviate Cd stress and increased the chlorophyll content of wheat to enhance photosynthesis.