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林业科学 ›› 2019, Vol. 55 ›› Issue (12): 21-31.doi: 10.11707/j.1001-7488.20191203

• 论文与研究报告 • 上一篇    下一篇

光合色素含量差异对花叶唐竹不同叶色表型光合特性的影响

陈凌艳1,谢德金2,荣俊冬2,赖金莉1,林雪玲1,郑郁善1,*   

  1. 1. 福建农林大学园林学院 福州 350002
    2. 福建农林大学林学院 福州 350002
  • 收稿日期:2018-08-19 出版日期:2019-12-25 发布日期:2020-01-02
  • 通讯作者: 郑郁善
  • 基金资助:
    福建省自然科学基金项目(2019J01663);福建省中青年教师教育科学研究项目(JAT170197);福建省科技重大专项(2013NZ0001);福建农林大学科技创新专项基金项目(CXZX2016099)

Effects of Photosynthetic Pigment Content on Photosynthetic Characteristics of Different Leaf Color Phenotypes of Sinobambusa tootsik f. luteoloalbostriata

Lingyan Chen1,Dejin Xie2,Jundong Rong2,Jinli Lai1,Xueling Lin1,Yushan Zheng1,*   

  1. 1. College of Landscape Architecture, Fujian Agriculture and Forestry University Fuzhou 350002
    2. College of Forestry, Fujian Agriculture and Forestry University Fuzhou 350002
  • Received:2018-08-19 Online:2019-12-25 Published:2020-01-02
  • Contact: Yushan Zheng
  • Supported by:
    福建省自然科学基金项目(2019J01663);福建省中青年教师教育科学研究项目(JAT170197);福建省科技重大专项(2013NZ0001);福建农林大学科技创新专项基金项目(CXZX2016099)

摘要:

目的: 研究光合色素含量差异对花叶唐竹4种叶色表型光合特性的影响,为花叶竹类的栽培和选育提供参考。方法: 以花叶唐竹2年生分株苗为研究对象,测定全绿、绿底白纹、白底绿纹、全白4种表型叶片的光合色素含量、光合生理参数及叶绿素荧光参数,分别观察绿色叶肉细胞和白色叶肉细胞的超微结构。结果: 4种表型间叶片光合色素含量差异显著,且随着叶片绿色面积比例的下降而呈现显著下降趋势;花叶唐竹绿色叶肉细胞的细胞器排列紧凑且十分完整,叶绿体发育健全,膜系统完善;在大多数白色叶肉细胞中,没有发现完整的叶绿体,而是发育不良的叶绿体和白色体;4种表型叶片的叶绿素含量与其净光合速率、气孔导度、蒸腾速率及水分利用率呈正相关,与胞间二氧化碳浓度呈负相关;全白叶片由于缺乏PSⅡ光反应中心,原初光能转化能力低下,且无法进行光抑制的一系列自我保护反应。结论: 花叶唐竹白色叶肉细胞中叶绿体发育缺陷导致其叶绿素合成受阻,进而影响光合能力,使其净光合速率全为负值,且其自我保护机制较差,强光下易被灼伤,故需要予以适当遮荫。

关键词: 花叶唐竹, 光合色素, 叶绿体结构, 光合特性, 叶绿素荧光

Abstract:

Objectve: Sinobambusa tootsik f. luteoloalbostriata is a bamboo species with creeping rhizomes, various levels of leave variegation and small- or medium-diameter stems, and has high ornamental value. This study aims to investigate the influence in photosynthetic capacity caused by variation in photosynthetic pigment content of four phenotypes of S.tootsik f. luteoloalbostriata cultivation, to lay a certain foundation for the cultivation and breeding of the bamboos with leave variegation. Method: Two-year-old seedlings of S. tootsik f. luteoloalbostriata were taken as materials. Photosynthetic pigment content, photosynthetic parameters and chlorophyll fluorescence parameters of the leaves of four phenotypes, including the whole green leaves, green leaves with white stripes, white leaves with green stripes and whole white leaves, were measured, and ultrastructure of green and white mesophyll cells were observed as well. Result: There was a significant difference in photosynthetic pigment content among four phenotypes, and it showed a significant reduction trend as the green area decreased in the leaves. The organelles of green mesophyll cells in S. tootsik f. luteoloalbostriata mesophyll were compact and intact, the chloroplast was well developed, and the membrane system was also well developed. In most white mesophyll cells, no complete chloroplast was found. Instead, degraded chloroplasts and etioplasts were found. The chlorophyll content was positively correlated with net photosynthetic rate, stomatal conductance, transpiration rate and water use efficiency, but negatively correlated with the intercellular CO2 concentration. The original light energy capacity was low in white leaves due to the lack of PSⅡ reaction center, and a series self-protection of light inhibition could not be carried out. Conclusion: The developmental defect of chloroplasts in white mesophyll cells of S. tootsik f. luteoloalbostriata obstructed the chlorophyll synthesis, which affected the photosynthetic ability, so that the net photosynthetic rate was negative. With a poor self-protection mechanism, white leaves are easy to be burned under strong light, so appropriate shade is needed.

Key words: Sinobambusa tootsik f. luteoloalbostriata, photosynthetic pigment, chloroplast structure, photosynthetic characteristics, chlorophyll fluorescence

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