作物学报 ›› 2011, Vol. 37 ›› Issue (11): 2085-2093.doi: 10.3724/SP.J.1006.2011.02085
王彩娟1,2,李志强3,王晓琳1,2,姜闯道1,*,唐宇丹1,谷卫彬1,石雷1
WANG Cai-Juan1,2,LI Zhi-Qiang3,WANG Xiao-Lin1,2,JIANG Chuang-Dao1,*,TANG Yu-Dan1,GU Wei-Bin1,SHI Lei1
摘要: 室外盆栽条件下, 设置2个NaCl浓度(100 mmol L–1和200 mmol L–1), 调查盐胁迫对甜高粱光合特性和光系统II (PSII)活性的影响。结果表明,叶片Na+离子含量与Na+/K+比随盐浓度增加和处理时间延长而增加。净光合速率(Pn)、光系统II开放反应中心天线转化效率(Fv¢/Fm¢)、光化学猝灭系数(qP)和光系统II实际光化学效率(ΦPSII)随盐浓度的增加而降低,非光化学猝灭(NPQ)随盐浓度增加而增加;100 mmol L–1处理组的Pn、Fv¢/Fm¢、qP和ΦPSII随处理时间延长有所恢复,但200 mmol L–1处理组无此现象。光系统II (PSII)最大光化学效率(Fv/Fm)在100 mmol L–1 NaCl处理时影响较小,但在200 mmol L–1 NaCl处理时明显下降。短期盐胁迫未影响荧光诱导动力学曲线,而200 mmol L–1 NaCl处理5 d后荧光诱导动力学曲线O-K和O-J相上升。进一步研究证明,PSII的失活速率在两个盐浓度下均无明显变化,而修复速率在200 mmol L–1盐浓度处理5 d后降低明显。因此,认为室外盆栽条件下盐胁迫造成甜高粱碳同化能力降低并改变PSII激发能分配;叶片Na+离子含量的大幅增加会导致PSII活性下降及光抑制,这与PSII失活速率无关,主要是失活PSII修复速率受抑制的结果。这对理解户外盐胁迫条件下C4作物的光抑制机制具有一定意义。
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