Planta Daninha (2003) 21, 1-9

S.O. Procópio, E.A. Ferreira, E.A.M. Silva, A.A. Silva, R.J.N. Rufino and J.B. Santos (2003)
Estudos anatômicos de folhas de espécies de plantas daninhas de grande ocorrência no Brasil. III - Galinsoga parviflora, Crotalaria incana, Conyza bonariensis e Ipomoea cairica
[Leaf anatomical studies in weed species common in Brazil: III - Galinsoga parviflora, Crotalaria incana, Conyza bonariensis and Ipomoea cairica]
Planta Daninha 21 (1), 1-9
Abstract: This research is aimed to study the leaf anatomy of the weed species Galinsoga parviflora, Crotalaria incana, Conyza bonariensis and Ipomoea cairica, widely known in Brazil, to acquire a better understanding of the barriers each species imposes upon herbicide penetration, and to find strategies to overcome these obstacles. The completely expanded leaves from the third to the fifth nodes were collected from spontaneous plants in the field. Three samples with approximately 1 cm² were taken from the leaves of each species, at the central portion and were used in structure and clarification studies as well as in scanning-electron microscope (SEM) observations. All species were found to be amphistomatic. The potential main leaf barriers against herbicide penetration were found to be low stomatic density in the adaxial side in G. parviflora; high epicuticular wax content in C. incana; and high trichome density, high cuticle thickness in the adaxial side and low stomatic density in the adaxial side in C. bonariensis. High cuticle thickness in the adaxial side and low stomatic density in the adaxial side were the possible herbicide barriers observed in the leaves of I. cairica.
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(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Galinsoga parviflora (weed)		Brazil (south)
	Erigeron bonariensis (weed)		Brazil (south)
	Crotalaria incana (weed)		Brazil (south)
	Ipomoea cairica (weed)		Brazil (south)