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- 2018
遮阴条件下大叶竹节树光合特性和荧光参数的变化
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Abstract:
为研究大叶竹节树对弱光的适应性，通过盆栽实验，分析了不同程度(0%，25%，50%，75%)遮阴条件下大叶竹节树幼苗光合特性和荧光参数的变化.结果表明，随着遮阴程度增加，叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)和光合有效辐射(PAR)随之减小，而胞间CO2浓度(Ci)随之增大，说明非气孔制限因素是大叶竹节树光合速率下降的主要原因.各遮阴条件下叶片总叶绿素(a+b)、叶绿素a和叶绿素b质量比均显著高于全光照，且随遮阴程度的增加叶绿素质量比逐渐上升，而叶绿素a/b值则随着遮阴程度的增强而下降.叶绿素荧光参数PSⅡ原初光能转化效率(Fv/Fm)和潜在活性(Fv/Fo)的日变化呈单谷曲线；各遮阴条件下Fv/Fm和Fv/Fo值均高于全光照，且与遮阴程度正相关，说明大叶竹节树是一种耐荫性很强的植物.在遮阴条件下，光补偿点、光饱和点、净光合速率、暗呼吸速率和叶绿素a/b值降低，而叶绿素a和b质量比、光能利用率、Fv/Fm以及Fv/Fo值提高，从而增强弱光条件下的生长能力.
To study the adaptability of Carallia garciniaefolia to low light conditions, the effects of different shading treatments (25%, 50% and 75% shading) on the photosynthetic characteristics and chlorophyll fluorescence of C. garciniaefolia seedlings were studied in a pot experiment. The results showed that net photosynthetic rate (Pn), stomatal conductivity (Gs), transpiration rate (Tr), water use efficiency (WUE) and photosynthetic active radiation (PAR) of the plant decreased, while its stomatal CO2 concentration (Ci) increased significantly with increasing shading, suggesting that non-stomatal limitation is the main cause of the reduction in photosynthesis rate of C. garciniaefolia. The contents of total chlorophyll (a+b), chlorophyll a and chlorophyll b in the leaves of the plants grown under different shading conditions were all significantly higher than under full day light, and increased with increasing shading, while chlorophyll a/b decreased. Fv/Fm and Fv/Fo in the shading treatments were
| [1] | ARNON D I. Copper Enzymes in Isolated Chloroplasts. Polyphenoloxidase in Beta Vulgaris[J]. Plant Physiology, 1949, 24(1): 1-15. DOI:10.1104/pp.24.1.1 |
| [2] | 赵顺, 黄秋娴, 李玉灵, 等. 遮荫处理对臭柏幼苗光合特性的影响[J]. 生态学报, 2014, 34(8): 1994-2002. |
| [3] | 黄世满, 吴庆书, 符气浩. 海南岛新绿化树种——竹节树[J]. 海南大学学报(自然科学版), 1996, 14(1): 43-46. |
| [4] | 万盼, 熊兴政, 黄小辉, 等. 2种农药胁迫对油桐幼苗叶绿素荧光特性及生长的影响[J]. 林业科学, 2016, 52(7): 22-29. |
| [5] | 陈香, 谭家得, 丁岳炼, 等. 干旱胁迫对竹节树幼苗生长的影响[J]. 福建林业科技, 2016, 43(2): 129-133. |
| [6] | BOARDMAN N K. Comparative Photosynthesis of Sun and Shade Plants[J]. Annual Review of Plant Physiology, 1977, 28(1): 355-377. DOI:10.1146/annurev.pp.28.060177.002035 |
| [7] | 许大全. 光合作用效率[M]. 上海: 上海科学技术出版社, 2002: 39-96. |
| [8] | GOODWIN T W. The Biochemistry of the Carotenoids[M]. USA: Springer, 1980: 529. |
| [9] | 梁丽丽, 谢腾芳, 薛立, 等. 3种松树林林分改造树种的生长格局[J]. 生态科学, 2009, 28(1): 9-12. |
| [10] | BIERHUIZEN J F, SLATYER R O. Effect of Atmnospheric Concentration of Water Vapor and CO2 in Determing Transpiration-Photosynthesis Pelationships of Cotton Leaves[J]. Agric Meteoro, 1965, 2(4): 259-270. DOI:10.1016/0002-1571(65)90012-9 |
| [11] | 舒海燕, 江洪, 马锦丽, 等. 施用竹炭对卷心菜叶绿素含量和荧光参数的影响[J]. 西南大学学报(自然科学版), 2015, 37(9): 49-57. |
| [12] | 武海, 张树源, 许大全, 等. 珊瑚树叶片叶绿素荧光非光化学猝灭的日变化和季节变化[J]. 植物生理学报, 1997, 23(2): 145-150. |
| [13] | 谭家得, 薛克娜, 王志云, 等. 抗污染树种等级划分及其应用[J]. 中国城市林业, 2005, 3(6): 40-45. |
| [14] | 刘悦秋, 孙向阳, 王勇, 等. 遮荫对异株荨麻光合特性和荧光参数的影响[J]. 生态学报, 2007, 27(8): 3457-3464. |
| [15] | 殷爱华, 胡羡聪, 吴小英, 等. 珠三角地区优良降噪树种的初步选择[J]. 广东林业科技, 2006, 22(4): 79-82. |
| [16] | FARQUHAR G D, SHARKEY T D. Stomatal Conductance and Photosynthesis[J]. Annual Review of Plant Physiology, 1982, 33(1): 317-345. DOI:10.1146/annurev.pp.33.060182.001533 |
| [17] | AbRAM M D. Leaf Structural and Photosynthetic Pigments Characteristics of Tree Gallery Forest Hardwood Species in Northeast Kansas[J]. For Ecol. Manage, 1987, 22(3): 261-266. |
