长期冷适应对黑皮果蔗光合光能利用的影响  

Effects of long-time chill acclimation on light use efficiency in photosynthesis of chewing cane Saccharum officinarum L. cv. Badila

作　　者：朱俊杰[1,2] 李杨瑞 

机构地区：[1]广西农业科学院农产品质量安全与检测技术研究所,南宁530007 [2]农业部广西甘蔗生物技术与遗传改良重点实验室,南宁530007

出　　处：《生态学杂志》2014年第12期3295-3299,共5页Chinese Journal of Ecology

基　　金：广西自然科学基金面上项目(2011GXNSFA018082);广西自然科学基金创新团队项目(2011GXNSFF018002)资助

摘　　要：以拔地拉(Saccharum officinarum L.cv.Badila)幼苗为材料,研究了长期(28 d)冷适应处理(白天/夜间:12℃/8℃)对其光合光能利用的影响。结果表明:无论是常温(25℃)还是低温(12℃)测定,冷适应处理明显降低了蔗苗净光合速率(Pn),增加了暗呼吸速率(Rd)和电子传递量子效率和碳同化量子效率比值(ΦPSII/ΦCO2);常温下,冷适应处理降低了不同光强下Fv'/Fm'(和NPQ反向变化)随ΦPSII下降而下降的速率,同时增加了光化学淬灭q P随ΦPSII下降而下降的速率;而低温下,不同光强下Fv'/Fm'及q P随ΦPSII下降而下降的速率与对照没有显著差异;长期冷适应处理通过光化学途径和非光化学途径耗散了光合机构多余激发能,改善了其光合冷敏性,对果蔗抗冷栽培和抗低温育种有重要参考价值。Saccharum officinarum L. cv. Badila seedlings were used to study the effect of longtime chill acclimation（ 12 ℃ /8 ℃ for 28 days） on the light use efficiency in photosynthesis.The results showed that chill acclimation decreased the net photosynthetic rate but increased the dark respiration rate（ Rd） and the ratio of PSII operating efficiency to CO2 assimilation efficiency（ ΦPSII/ ΦCO2） compared with the seedlings grown at 25 ℃ /20 ℃（ control） regardless at ambient temperature（ 25 ℃） or at low temperature（ 12 ℃）. The measurement under ambient temperature showed the chill acclimation decreased the declining rate of Fv’ / Fm’（ changing reversely to NPQ） declining with ΦPSIIwhile increased the declining rate of photochemical quenching（ q P）declining with ΦPSIIat different light intensities. The measurements at low temperature,however,showed no significant differences in the declining rates of Fv’ / Fm’ and q P declining with ΦPSII compared with the control. It was indicated that the long-time chill acclimation treatment dissipated the excessive light energy through both non-photochemical and photochemical quenching pathways,thus improved its photosynthetic sensitivity to chill. The present study provides important references for chilling-resistant breeding and cultivation of chewing cane.

关 键 词：拔地拉 叶绿素荧光 电子传递 气体交换 光能耗散 

分 类 号：S566.1[农业科学—作物学]