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园艺学报 ›› 2005, Vol. 32 ›› Issue (1): 25-29.

• 研究论文 • 上一篇    下一篇

高温强光下耐热性不同的两个甘蓝品种幼苗光合作用差异的研究

付振书;赵世杰;孟庆伟;魏佑营   

  1. (1 山东省作物生物学重点实验室, 泰安27018; 2 山东农业大学园艺学院, 泰安271018)
  • 收稿日期:2003-12-11 修回日期:2004-02-17 出版日期:2005-02-25 发布日期:2005-02-25

Study on Difference of Photosynthesis in Cabbage(Brassica oleracea L. ) Cultivars(Heat-sensitive and Heat-tolerant) at High Temperature in High Light

Fu Zhenshu;Zhao Shijie;Meng Qingwei;Wei Youying   

  1. (1 Shandong Key Laboratory of Crop Biology, Tai'an 271018, China; 2College of Horticulture, Shandong Agricultural University, Tai'an 271018, China )
  • Received:2003-12-11 Revised:2004-02-17 Online:2005-02-25 Published:2005-02-25

摘要: 以耐热性不同的两个甘蓝(Brassica oleracea L. var. capitata) 品种为材料, 对短期高温强光胁迫下光合作用的差异做了初步探讨, 结果表明: 在叶温40℃, 1 200μmol·m- 2 ·s- 1的光强下, ‘大牛心’净光合速率比‘无粉8号’高出约30% , 与28℃叶温下光合速率结果相比较, 两品种分别降低7%和24% , 高温下, 大牛心的光合速率显示较强的耐热性。40℃预处理后随着光强的升高, 光系统II ( PSII)的电子传递效率(ΦPSII) 和PSII的激发能捕获效率( Fv'/Fm') 持续下降, 而非光化学猝灭(NPQ) 持续增加, 慢组分( qI) 一直维持在NPQ的10%左右, NPQ的增加主要是快组分( qf) 的迅速增加。可见高温强光胁迫下依赖于叶黄素循环的高能态猝灭是甘蓝幼苗叶片耗散过剩激发能的主要方式。然而两品种之间ΦPSII、Fv'/Fm'、NPQ及其qf和qI均无显著性差异, 且最大光化学效率( Fv/Fm) , 细胞间隙CO2 浓度(Ci) , 光呼吸速率( Pr) 也无显著性差异。因此在短期高温强光胁迫下两品种净光合速率差异主要取决于与光反应无关的非气孔限制。

关键词: 甘蓝, 高温强光, 光合速率, ΦPSII, NPQ

Abstract: Two types of cabbage cultivars ( heat-sensitive and heat-tolerant) were used asmaterial to study the difference of photosynthesis under short-term high temperature stress with high light. Results showed that photosynthetic rate of‘Daniuxin’was app roximately 30% higher than that of‘Wufen 8’under 1200 mol·m- 2 ·s- 1 PFD when leaf temperature was 40℃. Compared with at 28℃, their photosynthetic rates decreased 7% and 24%, respectively. Under 40℃, the quantum yield of PSII electron transport (ΦPSII) and maximal
photochemical efficiency of PSII in the light ( Fvp/Fmp) decreased with the increase of light, but non-photochemical quenching (NPQ) increased continuously, its slow-component ( q I) remained app roximately 10% of
NPQ, the increase of fast component ( qf) is the main factor leading to the increase of NPQ, indicating that xanthophyll cycle2dependent‘high energy’quenching was the main mechanism for effectively dissipating the excess excitation energy. However, there were no significant differences inΦPSII, Fv'/Fm', NPQ, qf, qI between two types of cabbage cultivars. In addition, no significant difference was observed in maximal photochemical efficiency of PSII (Fv/Fm) , intercellular CO2 concentration (Ci) , photoresp iratory rate (Pr). Therefore,the difference of photosynthetic rates between two cultivars under short-term high temperature stresswith the high lightmight result from non-stomatal limitation which had no relation with photoreaction process.

Key words: Brassica oleracea L. var. capitata L., High temperature and high light, Net photosynthetic rate, ΦPSII, NPQ

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