论文部分内容阅读
以0.1mmol L-1SNP为NO供体,对小麦幼苗根系进行-0.5 MPa PEG胁迫处理,研究了NO对胁迫后叶片电子传递、光能分配和反应中心开放等PSII功能的影响,以探讨NO在干旱条件下对植物光合作用的调节作用。在干旱胁迫的第1天和第3天,SNP处理不但增加了水势(Ψw)和叶绿素含量,且能维持PSII反应中心的电子传递(ФPSII和Fm/Fo)及潜在高光合效率(Fv/Fo);干旱胁迫减少了PSII反应中心开放的比例(qP)和PSII反应中心捕获光能的转化效率,但SNP处理后PSII开放反应中心的比例增加,利于干旱条件下叶片吸收的能量用于光化学反应(Pr)和PSII反应中心安全地耗散过剩光能。综上所述,干旱条件下NO对小麦幼苗叶片的PSII功能具有调节作用。
The effects of NO on the PSII function such as electron transfer, light energy distribution and opening of reaction center were studied under the stress of -0.5 MPa PEG with 0.1 mmol L-1SNP as NO donor. Regulation of Plant Photosynthesis under Drought Conditions. On day 1 and day 3 of drought stress, SNP treatment not only increased water potential (Ψw) and chlorophyll content, but also maintained electron transport (ФPSII and Fm / Fo) and potential photosynthetic efficiency (Fv / Fo ). Drought stress reduced the open ratio (qP) of PSII reaction center and the conversion efficiency of PSII capture light energy. However, the proportion of PSII open reaction center increased after SNP treatment, and the energy absorbed by leaves in drought condition was used for photochemical reaction (Pr) and PSII reaction centers safely dissipate excess light energy. In conclusion, NO can regulate the PSII function of wheat seedling leaves under drought conditions.