Coordination of intertracheid pit traits and climate effects among cycads
Coordination of intertracheid pit traits and climate effects among cycads
复制标题
苏铁管胞间坑特征与气候影响的协调
DOI：
10.1111/ppl.13924
复制
发表时间：
2023
影响因子：
6.4
通讯作者：
Jiang, Guo‐Feng
中科院分区：
文献类型：
--
作者：
Pang, Yu‐Kun;Qin, Lan‐Li;Zhang, Tian‐Hao;Lei, Jin‐Yan;Zhang, Ya;Roddy, Adam B.;Jiang, Guo‐Feng
导管间纹孔膜是初生细胞壁中与相邻导管相连的可渗透区域，在木质部导管之间的水分关系和营养物质的运动中起着至关重要的作用。然而，如何坑膜特性可能会影响水碳耦合仍然很少研究苏铁。我们研究了坑的特点，解剖和光合特性的13苏铁从一个共同的花园，以确定坑的特点和它们的协调与水的关系和碳经济。我们发现苏铁的纹孔特征是高度可变的，并且苏铁表现出与其他植物谱系相似的纹孔密度和纹孔面积之间的权衡。苏铁的纹孔膜、纹孔孔径和纹孔形状不像被子植物那样协调一致，苏铁的纹孔膜面积比蕨类和被子植物大，纹孔密度比裸子植物小，纹孔密度与非苏铁的裸子植物相似;（3）苏铁纹孔膜面积和密度与解剖性状部分协调，轴的水力供应与光合作用正协调，（4）苏铁纹孔特征反映了苏铁科植物对湿润生境的适应性，泽米科植物对干旱生境的适应性。坑性状的大的变化，独特的坑膜的大小和密度，以及部分协调坑性状与解剖和生理特征的轴和羽片苏铁之间可能促进了他们的优势，在各种生态系统从中生代到现代。
Interconduit pit membranes, which are permeable regions in the primary cell wall that connect to adjacent conduits, play a crucial role in water relations and the movement of nutrients between xylem conduits. However, how pit membrane characteristics might influence water‐carbon coupling remains poorly investigated in cycads. We examined pit characteristics, the anatomical and photosynthetic traits of 13 cycads from a common garden, to determine if pit traits and their coordination are related to water relations and carbon economy. We found that the pit traits of cycads were highly variable and that cycads exhibited a similar tradeoff between pit density and pit area as other plant lineages. Unlike other plant lineages (1) pit membranes, pit apertures, and pit shapes of cycads were not coordinated as in angiosperms; (2) cycads exhibited larger pit membrane areas but lower pit densities relative to ferns and angiosperms, but smaller and similar pit membrane densities to non‐cycad gymnosperms; (3) cycad pit membrane areas and densities were partially coordinated with anatomical traits, with hydraulic supply of the rachis positively coordinated with photosynthesis, whereas pit aperture areas and fractions were negatively coordinated with photosynthetic traits; (4) cycad pit traits reflected adaptation to wetter habitats for Cycadaceae and drier habitats for Zamiaceae. The large variation in pit traits, the unique pit membrane size and density, and the partial coordination of pit traits with anatomical and physiological traits of the rachis and pinna among cycads may have facilitated their dominance in a variety of ecosystems from the Mesozoic to modern times.