摘要
以玉米为实验材料,研究了干旱胁迫对玉米幼苗叶绿素荧光参数的影响.结果表明:与对照相比,干旱胁迫下,随着土壤含水量的降低,玉米叶片水势下降,叶片叶绿素荧光参数Fv、Fv/Fm、ΦPSⅡ和qP不断下降,下降程度随干旱胁迫加剧而逐渐增大;而qN则随干旱胁迫程度加剧而增加;且复水后,各参数均有明显恢复趋势,说明干旱造成的PSⅡ活性下调可能与光系统通过非光化学耗散过剩激发能以保护光合机构免于进一步破坏有关.
The method of chlorophyll fluorescence kinetics technology was used to study chlorophyll fluorescence parameters of maize seedling under drought stress. The results showed that under the drought condition,leaf water contents were decreased along with the decline in soil water contents. Chlorophyll fluorescence parameters derived from analyzing modulated chlorophyll fluorescence, such as such as Fv/Fm,Yeild and q P, showed a strong progressive drop on the days 3, 5, and 7 after water defitics application, showed a significant decreases in mize leaves in response to progressive water deficit. However,.q N showed a reverse trend. This implied that the declines in components of thylakoid membrane caused by water deficits and salinity might contribute to protect the photosynthetic apparatus against damage of excessive energy.
出处
《济宁学院学报》
2016年第3期9-15,共7页
Journal of Jining University
基金
国家自然科学基金(30470164)
厦门大学新世纪优秀人才支持计划项目(NCETXMU)
山东省自然科学基金(ZR2014CL001)
济宁学院青年科研基金项目(2014QNKJ06)
济宁学院教学改革研究项目(2013JX24)
关键词
玉米
干旱胁迫
叶绿素荧光
maize
drought stress
chlorophyll fluorescence
