摘要: |
以花叶类玉兰的全绿叶、花叶和全黄叶为试验材料,从叶片光合色素含量、叶片解剖结构、光响应曲线等方面探讨3种类型叶片的解剖结构与光合特性的关系,从解剖学揭示花叶类玉兰光合特性成因。研究结果表明:(1)花叶类玉兰的黄色叶斑是由叶绿体结构异常导致叶绿素含量降低形成的叶绿素型叶斑;(2)花叶类玉兰黄色区域类囊体结构异常,ATP合成受阻,阻碍了光合作用的正常进行;(3)解剖结构显示全绿叶栅栏组织发达,叶绿体完整性和色素含量均高于花叶和全黄叶,其净光合速率较高;(4)全绿叶和花叶的最大净光合速率和光饱和点存在显著性差异,全绿叶较花叶能够耐受更大范围的强光。研究进一步阐明花叶类玉兰的叶绿体结构影响其光合特性,研究结果为花叶类玉兰的优良种质选育提供参考。 |
关键词: 光合色素 解剖结构 叶绿体结构 光合特性 相关性分析 |
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Photosynthetic Characteristics of Yulania denudata with Variegated Leaf Based on Anatomy |
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1.School of Tropical Agriculture and Forestry,Hainan University;2.Shanghai Chenshan Botanical Garden
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Abstract: |
The green leaves, variegated leaves and yellow leaves of Yulania denudata with variegated leaf were used as experimental materials. The anatomical structure and photosynthetic characteristics of three types of leaves were compared from the aspects of photosynthetic pigment content, leaf anatomical structure and light response curve, the factor of photosynthetic characteristics of Yulania denudata with variegated leaf was revealed from anatomy. The the result of research as follows: (1) The yellow leaf spots of Yulania denudata with variegated leaf is chlorophyll-type leaf spots formed by the decrease of chlorophyll content due to the abnormal structure of chloroplasts; (2) The structure of the thylakoids in the yellow region of the flower and leaf Yulania denudata with variegated leaf was abnormal, and ATP synthesis was blocked, which hindered the progress of photosynthesis; (3) The anatomical structure showed that the palisade tissue of the green leaf was developed, the chloroplast integrity and pigment content were higher than that of the variegated leaf and the yellow leaf, and the net photosynthetic rate was higher;(4) There was a significant difference in the maximum net photosynthetic rate and light saturation point between the green leaf and the variegated leaf, and the green leaf can withstand a wider range of bright light than the variegated leaf. This study further elucidates that that the chloroplast structure of Yulania denudata with variegated leaf affected its photosynthetic characteristics, and the results provided references for the breeding of fine varieties. |
Key words: photosynthetic pigment anatomical structure chloroplast structure photosynthetic characteristics correlation analysis |