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DOI: 10.1055/s-2007-965080
Georg Thieme Verlag Stuttgart KG · New York
Morphology and Anatomy of Shoot, Root, and Propagation Systems in Hoffmannseggia glauca
Publikationsverlauf
Received: October 2, 2006
Accepted: February 16, 2007
Publikationsdatum:
31. Mai 2007 (online)
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Abstract
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.
Key words
Hoffmannseggia glauca - shoot - root - propagation system - morphology - anatomy.
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R. N. Malpassi
Morfología Vegetal
Facultad de Agronomía y Veterinaria
Universidad Nacional de Río Cuarto
Ruta 36 km 601
5800 Río Cuarto, Provincia de Córdoba
Argentina
eMail: rmalpassi@ayv.unrc.edu.ar
Editor: F. R. Scarano