Dadras Armin, Duminil Pauline, de Vries Sophie, Irisarri Iker, Feussner Ivo, de Vries Jan
Department of Applied Bioinformatics, Institute of Microbiology and Genetics, University of Goettingen, Goldschmidtstr. 1, Goettingen, 37077, Germany.
Department of Plant Biochemistry, Albrecht von Haller Institute for Plant Sciences, University of Goettingen, Justus-von-Liebig Weg 11, Goettingen, 37077, Germany.
Plant J. 2025 Jun;122(6):e70291. doi: 10.1111/tpj.70291.
We computed co-expression networks from more than 2200 samples of nine species across 600 million years of divergent streptophyte evolution and infer that the streptophyte algal ancestors of land plants already had a remarkable fraction of the embryophytic stress response system. Despite its phytohormone-independent origin, homologs of all core components of the drought hormone abscisic acid (ABA) subnetwork are present, and we find that most are co-expressed in streptophyte algae and land plants; this subnetwork was thus co-opted in embryophytes by bringing it under the regime of ABA. The last common ancestor of embryophytes and Zygnematophyceae algae had ancient stress-responsive pathways, enabling it to face the stresses typical of the land environment - even before the origin of land plants - while evolution on land led to the adaptive refinement of these responses.
我们从跨越6亿年分歧的链形植物进化的9个物种的2200多个样本中计算共表达网络，并推断陆地植物的链形植物藻类祖先已经拥有相当一部分胚胎植物应激反应系统。尽管其起源与植物激素无关，但干旱激素脱落酸（ABA）子网络所有核心成分的同源物都存在，并且我们发现大多数同源物在链形植物藻类和陆地植物中是共表达的；因此，这个子网络通过使其处于ABA的调控之下而被胚胎植物所利用。胚胎植物和双星藻纲藻类的最后一个共同祖先拥有古老的应激反应途径，使其能够面对陆地环境特有的压力——甚至在陆地植物起源之前——而在陆地上的进化导致了这些反应的适应性优化。
