高粱、紫苏叶脉密度与光合特性的关系

doi:10.3724/SP.J.1259.2015.00100

植物学报 ›› 2015, Vol. 50 ›› Issue (1): 100-106.DOI: 10.3724/SP.J.1259.2015.00100

高粱、紫苏叶脉密度与光合特性的关系

宋丽清^1,², 胡春梅¹, 侯喜林¹, 石雷², 刘立安², 杨景成³, 姜闯道^2,^*()

¹南京农业大学, 南京 210095
²中国科学院植物研究所, 北京 100093
³北京自然博物馆, 北京 100101

收稿日期:2014-02-07 接受日期:2014-06-09 出版日期:2015-01-01 发布日期:2015-04-09
通讯作者: 姜闯道
作者简介:
? 共同第一作者
基金资助:
中国科学院知识创新方向性项目(No.KSCX2-EW-B-9)、北京市自然科学基金(No.6122025)和北京市科委项目(No.Z1411000- 06014036)

Relationship Between Photosynthetic Characteristics and Leaf Vein Density in Sorghum bicolor and Perilla frutescens

Liqing Song¹, Chunmei Hu¹, Xilin Hou¹, Lei Shi², Li’an Liu², Jingcheng Yang³, Chuangdao Jiang^{2, *}

¹Nanjing Agricultural University, Nanjing 210095, China
²Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
³Beijing Natural Museum, Beijing 100101, China

Received:2014-02-07 Accepted:2014-06-09 Online:2015-01-01 Published:2015-04-09
Contact: Jiang Chuangdao
About author:
? These authors contributed equally to this paper

摘要/Abstract

摘要： 叶脉是植物叶片光合作用水分输送的重要结构。为阐述叶脉与光合特性之间的关系, 以C₄植物高粱(Sorghum bicolor)、C₃植物紫苏(Perilla frutescens)为实验材料研究了叶脉密度和光合特性之间的关系。结果表明, 与紫苏相比, 高粱叶片叶脉密度大, 导水能力强, 蒸腾速率高, 但气孔密度小。进一步分析表明, 高粱叶片近轴侧气孔密度占总气孔的比例明显高于紫苏。叶脉密度大的高粱具有较高的净光合速率; 而紫苏叶脉密度小, 净光合速率也较低。由此表明, 较高的叶脉密度有利于支持较高的光合速率, 但研究表明叶脉密度和气孔密度可能不存在严格的协同变异关系。研究结果对理解植物光合作用适应有重要意义。

Abstract: Leaf vein is an important structure for plant photosynthesis and water transportation. In this study, leaf vein density and photosynthetic characteristics were examined to explore the relationship between them in Sorghum bicolor and Perilla frutescens seedlings. Compared with perilla, sorghum leaves had higher leaf vein density, stomatal conductance (G_s) and leaf hydraulic conductance (K_leaf). While perilla leaves had higher stomatal density than sorghum leaves. For sorghum leaves, the proportion of stomata on the adaxial side accounted for 38.4% of the total stomata, which was significantly higher than that in perilla leaves. Sorghum leaves developed with higher vein density had higher net photosynthetic rate, whereas perilla leaves developed with lower vein density have lower net photosynthetic rate. Therefore, high photosynthetic rate in sorghum may be related to high vein density. However, there was no rigidly collaborative variation between leaf vein density and stomatal density. These conclusions are important for the study of photosynthetic adaptation to water availability.

宋丽清, 胡春梅, 侯喜林, 石雷, 刘立安, 杨景成, 姜闯道. 高粱、紫苏叶脉密度与光合特性的关系. 植物学报, 2015, 50(1): 100-106.

Liqing Song, Chunmei Hu, Xilin Hou, Lei Shi, Li’an Liu, Jingcheng Yang, Chuangdao Jiang. Relationship Between Photosynthetic Characteristics and Leaf Vein Density in Sorghum bicolor and Perilla frutescens. Chinese Bulletin of Botany, 2015, 50(1): 100-106.

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图/表 6

图1 高粱与紫苏叶面积和比叶面积的比较

Figure 1 Leaf area and specific leaf area of Sorghum bicolor and Perilla frutescens leaves

图2 高粱(A)和紫苏(B)近轴侧气孔比较 Bar=100 μm

Figure 2 The adaxial stomatas in Sorghum bicolor (A) and Perilla frutescens (B) leaves Bar=100 μm

图3 高粱与紫苏气孔密度(A)和气孔大小(B)的比较

Figure 3 Stomatal density (A) and stomatal length (B) in Sorghum bicolor and Perilla frutescens leaves

图4 高粱(A)和紫苏(B)叶脉的显微图像 Bar=100 μm

Figure 4 Microscopic photograph of veins in Sorghum bicolor (A) and Perilla frutescens (B) leaves Bar=100 μm

图5 高粱与紫苏叶脉密度(A)和水导度(Kleaf)(B)比较

Figure 5 Vein density (A) and hydraulic conductance (Kleaf) (B) of Sorghum bicolor and Perilla frutescens leaves

图6 气体交换参数对光强的响应 (A) 净光合速率(Pn); (B) 气孔导度(Gs); (C) 胞间CO2浓度(Ci); (D) 蒸腾速率(Tr)

Figure 6 Responses of gas exchange parameters to photosynthetic photon flux density (PPFD)(A) Net photosynthetic rate (Pn); (B) Stomatal conductance (Gs); (C) Intracellular CO2 concentration (Ci); (D) Transpiration rate (Tr)

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高粱、紫苏叶脉密度与光合特性的关系

Relationship Between Photosynthetic Characteristics and Leaf Vein Density in Sorghum bicolor and Perilla frutescens

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