强光下姜叶片的光呼吸及叶黄素循环

园艺学报 ›› 2002, Vol. 29 ›› Issue (1): 47-51.

强光下姜叶片的光呼吸及叶黄素循环

徐坤¹;邹琦²;郑国生²

(¹山东农业大学园艺学院, 泰安271018; ²山东农业大学生命科学学院, 泰安271018)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-02-25 发布日期:2002-02-25

Photorespiration and Xanthophyll Cycle in Adaptation to Strong Light in Ginger Leaves

Xu Kun¹, Zou Qi², and Zheng Guosheng²

(¹Horticultur al Department , Shandong Agricultural University, Tai'an 271018; ²Life Science College, Shandong Agricultural University, Tai'an 271018)

Received:1900-01-01 Revised:1900-01-01 Online:2002-02-25 Published:2002-02-25

摘要/Abstract

摘要： 姜叶片晴天中午的表观量子效率( AQY) 和PSÒ光化学活性(Fv/ Fm) 显著降低, 表明有明显的光抑制现象, 而干旱、高温、强光等逆境条件可显著加重光抑制程度。土壤水分胁迫使光呼吸速率( Pr) 降低, 峰值提前, Pr/ Pn 升高; 同时使叶黄素循环库增大, (A+ Z) / ( V+ A+ Z) 上升, 表明光呼吸和叶黄素循环是姜叶片耗散过剩光能的重要途径。

关键词: 姜, 光抑制, 光呼吸, 叶黄素循环

Abstract: Abstract: The apparent quantum yield (AQY) and photosystem Ò photochemical efficiency ( Fv/ Fm) in ginger ( Zingiber off icinale Rosc. ) leaves decreased significantly at clear midday, which indicated that obvious
photoinhibition occurred, eg. , the AQY of 80%, 60% , 40% relative soil water contents was 0. 0312, 0. 0296, 0. 0218 at 7: 00, but 0. 0261, 0. 0186, 0. 0108 at 13: 00, and the Fv/ Fm was 0. 788, 0. 762, 0. 752 at 7: 00, but 0. 728, 0. 682, 0. 601 at 13: 00, respectively. The stress condition, such as drought, high tem2 perature and strong light enhanced the photoinhibition considerably. When ginger leaves treated at 35 e, 1 200 Lmol#m- 2#s- 1 PFD, the Fv/ Fm was descended 12. 5% in an hour, but no changes at 25 e , dark in 6 hours. Decrease of photosynthesis and increased ratio of photorespiration to photosynthesis were observed in water stress condition. The de2epoxidation extent of xanthephyll cycle was accelerated in ginger leaves subjected towater stress. The data presented in this paper indicated that photorespiration and xanthophylls cycle were important
photoprotection mechanisms that effectively dissipate the excess light energy in ginger leaves.

Key words: Ginger, Photoinhibition, Photorespiration, Xanthophyll cycle

中图分类号:

徐坤;邹琦;郑国生. 强光下姜叶片的光呼吸及叶黄素循环[J]. 园艺学报, 2002, 29(1): 47-51.

Xu Kun;Zou Qi;and Zheng Guosheng. Photorespiration and Xanthophyll Cycle in Adaptation to Strong Light in Ginger Leaves[J]. ACTA HORTICULTURAE SINICA, 2002, 29(1): 47-51.

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