Kraus T A, Grosso M A, Basconsuelo S C, Bianco C A, Malpassi R N
Morfología Vegetal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina .
Plant Biol (Stuttg). 2007 Nov;9(6):705-12. doi: 10.1055/s-2007-965080. Epub 2007 May 31.
Hoffmannseggia glauca is a perennial weed that has tubers and root-borne buds. Some authors only consider root tubers without mentioning root-borne buds, while others consider that more anatomic studies become necessary to determine the origin of these structures and to interpret their behaviour. The objectives are: to study the growth form of the plant in order to analyze the ontogeny of its propagation organs, and to study its shoot and root anatomical characters that affect water conductivity. Hoffmannseggia glauca was collected in Argentina. Development of its shoot and root systems was observed. Shoots and roots were processed to obtain histological slides. Macerations were prepared to study vessel members. Primary and lateral roots originate buds that develop shoots at the end of the first year. In winter, aerial parts die and only latent buds at soil surface level and subterranean organs remain. In the following spring, they develop innovation shoots. Roots show localized swellings (tuberous roots), due to a pronounced increase of ray thickness and parenchymatous proliferation in the root center. Root vessel members are wider than those of aerial and subterranean shoots. Early development of an extensive root system, presence of root borne buds, anatomic and physiological specialization of innovation shoots, capability of parenchymatous rays to originate buds and tuberous roots, and high water transport efficiency in subterranean organs lead Hoffmannseggia glauca to display higher colonization potential than other species.
灰叶车轴草是一种多年生杂草，具有块茎和根生芽。一些作者只考虑根状块茎，而未提及根生芽，另一些作者则认为需要更多的解剖学研究来确定这些结构的起源并解释其行为。目的是：研究植物的生长形态，以分析其繁殖器官的个体发育，并研究其影响水分传导的地上部分和根部的解剖特征。灰叶车轴草采自阿根廷。观察其地上部分和根系的发育情况。对地上部分和根进行处理以获得组织切片。制备离析材料以研究导管分子。初生根和侧根产生的芽在第一年年底发育成地上部分。在冬季，地上部分死亡，仅土壤表面水平的潜伏芽和地下器官留存。在次年春天，它们发育出新芽。根呈现局部肿胀（块根），这是由于根中心射线厚度显著增加和薄壁组织增生所致。根的导管分子比地上部分和地下部分的导管分子更宽。广泛的根系早期发育、根生芽的存在、新芽的解剖学和生理学特化、薄壁射线产生芽和块根的能力以及地下器官中较高的水分运输效率，使得灰叶车轴草比其他物种具有更高的定殖潜力。
