Differentiation of aquatic weeds by multivariate analysis of foliar structural characters

Planta Daninha

Costa, N.V.¹  UNESP, Botucatu¹  Rodella, R.A.¹  UNESP¹  Martins, D.¹ 

关键词: aquatic plant;    infestation;    leaf anatomy.;   

DOI  :  10.1590/S0100-83582006000100002

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

Some aquatic plant species have caused great damage to hydroelectric power dams in Brazil, due to their great capacity of reproduction. Nineteen quantitative structural characters of leaf blades were used to differentiate Brachiaria mutica, Brachiaria subquadripara, Panicum repens, Eichhornia crassipes, Heteranthera reniformis, Typha subulata, and Enhydra anagallis. Leaf blade samples were collected, fixed in FAA 50, infiltrated in glycol metacrylate resin, cut transversally with 8 mm thickness, and stained with toluidine blue. Structural characters in vein and internerval regions were quantitatively evaluated (%) for adaxial and abaxial epidermis, vascular bundle, vascular bundle sheath, esclerenchyma, parenchyma, and spongy aerenchyma. Leaf thickness, stomata and trichome number were determined at the internerval region. The quantitative structural characters of the leaf were submitted to Clusters Analysis and Principal Components Analysis. Three groups were formed according to similarity levels: group 1 - B. mutica, B. subquadripara, and P. repens (Poaceae); group 2 - E. crassipes and H. reniformis (Pontederiaceae), and E. anagallis (Asteraceae); group 3 - only for T. subulata (Typhaceae). The structural characters with high discriminatory degree were: adaxial epidermis (internerval region); abaxial epidermis, vascular bundle, vascular bundle sheath, esclerenchyma and spongy aerenchyma (middle vein and internerval region); leaf thickness; and stomata number. The quantitative structural characters allowed the differentiation of these aquatic weed species during the vegetative period.

【 授权许可】

Unknown