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• 研究报告 • 上一篇    下一篇

长期冷适应对黑皮果蔗光合光能利用的影响

朱俊杰1,2**,李杨瑞2   

  1. (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)
  • 出版日期:2014-12-10 发布日期:2014-12-10

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

ZHU Jun-jie1,2**, LI Yang-rui2   

  1. (1 Agroproducts Quality Safety and Testing Technology Research Institute, Guangxi Academy of Agricultural Science, Nanning 530007, China; 2Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Nanning 530007, China)
  • Online:2014-12-10 Published:2014-12-10

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qPΦPSII下降而下降的速率;而低温下,不同光强下Fv′/Fm′及qPΦPSII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。

关键词: 杉木, 土壤氮转化速率, 森林类型, 土壤有效氮, 凋落物

Abstract: Saccharum officinarum L. cv. Badila seedlings were used to study the effect of longtime 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 ΦPSII while increased the declining rate of photochemical quenching (qP) declining with ΦPSII at different light intensities. The measurements at low temperature, however, showed no significant differences in the declining rates of Fv′/Fm′ and qP 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.

Key words: forest type, soil available N, litterfall, Chinese fir, soil nitrogen transformation rate