植物生态学报 ›› 2022, Vol. 46 ›› Issue (2): 136-147.DOI: 10.17521/cjpe.2021.0060

• 研究论文 • 上一篇    下一篇

天童山阔叶木本植物叶片大小与叶脉密度及单位叶脉长度细胞壁干质量的关系

熊映杰*, 于果*, 魏凯璐, 彭娟, 耿鸿儒, 杨冬梅, 彭国全**()   

  1. 浙江师范大学化学与生命科学学院, 浙江金华 321004
  • 收稿日期:2021-02-22 接受日期:2021-09-27 出版日期:2022-02-20 发布日期:2022-01-07
  • 通讯作者: 彭国全
  • 作者简介:(penggq@zjnu.cn)
    同等贡献
    ORCID:彭国全: 0000-0001-7645-6723
  • 基金资助:
    国家自然科学基金(31770647);浙江省“万人计划”科技创新领军人才项目(2019R52014)

Relationships between lamina size, vein density and vein cell wall dry mass per unit vein length of broad-leaved woody species in Tiantong Mountain, southeastern China

XIONG Ying-Jie*, YU Guo*, WEI Kai-Lu, PENG Juan, GENG Hong-Ru, YANG Dong-Mei, PENG Guo-Quan**()   

  1. College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
  • Received:2021-02-22 Accepted:2021-09-27 Online:2022-02-20 Published:2022-01-07
  • Contact: PENG Guo-Quan
  • About author:Contributed equally to this work
  • Supported by:
    National Natural Science Foundation of China(31770647);Ten Thousand Talents Program of Zhejiang Province(2019R52014)

摘要:

叶片大小是植物生态策略中的一个关键性状, 而叶脉是叶内主要的支撑和输导结构, 对叶片的生长发育具有重要的影响。该研究以天童山38种阔叶木本植物为研究对象, 以叶片面积、干质量和周长表征叶片大小, 采用标准化主轴估计(SMA)方法和系统发育独立比较(PIC)分析主脉密度、细脉密度和总叶脉密度, 以及各级叶脉单位长度的细胞壁干质量与叶片大小之间的关系, 拟从叶片内部结构和资源分配策略的角度探明叶片大小与叶脉结构之间的变化关系及生态学意义。研究结果显示: (1)叶片大小与主脉密度极显著负相关, 细脉密度以及总叶脉密度与叶片大小关系不显著, 表明叶片越小, 主脉密度越高, 而细脉密度与叶片大小无关; (2)单位主脉长度的细胞壁干质量与叶片大小极显著正相关, 单位细脉和总叶脉长度的细胞壁干质量与叶片大小的相关性均不显著, 表明随着叶片的增大, 单位主脉长度的细胞壁干质量显著增加, 而细脉的细胞壁干质量与叶片大小无关; (3)主脉密度与单位主脉长度的细胞壁干质量之间是斜率显著大于-1的负异速生长关系, 表明主脉密度随单位主脉长度的细胞壁干质量增加而显著下降, 两者之间存在权衡关系, 而单位细脉长度的细胞壁干质量与细脉密度关系不显著。上述结果表明, 与大叶片相比, 小叶中通常具有较高的主脉密度, 这不仅是叶片发育过程中叶形变化调控的结果, 也是单位叶脉长度的细胞壁干质量调控的结果, 单位叶脉长度的细胞壁干质量是导致叶片大小与主、细脉密度之间不同变化关系的直接因素。该研究结果为我们理解全球范围内叶片大小变化的生物地理分布模式以及植物对环境的适应策略提供了参考。

关键词: 叶片大小, 叶脉密度, 叶脉细胞壁干质量, 异速生长, 阔叶木本植物

Abstract:

Aims Leaf size is a key determinant of plant ecological strategy, and leaf vein is the main support and transport structure in leaf, which has an important role in the growth and development of leaf. The purpose of this study was to explore the evolutionary mechanism of leaf size by analyzing the relationships among lamina size, vein density as well as vein cell wall construction cost.

Methods In this study, 38 broad-leaved woody species were selected from Tiantong Mountain, southeastern China. The leaf size was characterized by lamina area, lamina dry mass and lamina perimeter. The standardized major axis estimation (SMA) and phylogenetically independent contrasts (PIC) methods were used to analyze the relationships between lamina size and major vein density, minor vein density, total vein density, as well as the cell wall construction cost per unit length of each order vein.

Important findings Our results demonstrated that: (1) Lamina size was significantly and negatively correlated with major vein density, but not with minor vein density and total vein density, indicating that the small leaves are generally with higher major vein density than those of large leaves, by contrast, the density of minor veins were independent of the final leaf size as was the total vein density; (2) There was a significantly positive correlation between lamina size and the cell wall mass per unit length of major vein, while there were no significant correlations between lamina size and the cell wall mass per unit length of minor vein and total vein, indicating that the biomass investment in cell wall per unit length of major veins would increase significantly with the increase of lamina size, while the biomass investment in cell wall per unit length of minor vein was independent of lamina size; (3) There was an allometric relationship with the slope significantly greater than -1 between the major vein density and their cell wall mass per unit length, and there was no significant correlation between the minor vein density and their cell wall mass per unit length, indicating that the major vein density would decrease significantly with the increase of the construction cost of the major vein. This is a trade-off allometric relationship, while the minor vein density was not affected by their construction cost. These results indicated that the high density of major veins in small leaves is not only the result of leaf shape regulation during leaf development, but also the result of a cost-benefit trade-off of vein cell wall construction. The results of this study have unique and key implications for understanding the global plant biogeographical trends of leaf size and the adaptation strategies of plants to the environment.

Key words: leaf size, vein density, vein cell wall dry mass, allometry growth, broad-leaved woody plant