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CONSIDERATIONS ON THE HISTO-ANATOMICAL STUDY OF THE LEAVES OF CYNARA SCOLYMUS L. TREATED WITH METHYLTHIOPHANATE (TOPSIN M)


LUMINIŢA I. HUŢANU-BASHTAWI, CONSTANTIN TOMA

Issue:

SCSB, Volume XII

Section:

Volume XII - Vegetal Biology

Abstract:

The purpose of this study was to investigate the histo-anatomical modifications of the leaves of Cynara scolymus L treated with thiophanate-methyl, compared with the untreated sample. There were three applications and two variants of treatment: 0.1 %, Topsin M70, a concentration used in agriculture and 0.4 % Topsin M70, for observing whether the limits of concentration between the modifications induced by thiophanate-methyl remain acceptable for the plant. Cross sections through the petiole and limb (the officinal product Cynarae folium), made at different levels were used, together with superficial sections for the upper and lower epidermis. The modifications observed were rather quantitative than qualitative, the general picture showing that the development of leaves was obviously stimulated.

For the treated plants, the comparative study revealed the following aspects: the thickness of petiole increased, the hypodermic walls of collenchymas are more developed, more specialized conducting bundles appear, with a larger diameter of the xylem vessels, cambium layer’s activity is more intensive; the form and dimensions of the median nervure are modified, the mesophyll tends to thicken, the pallisade parenchyma being much more developed; the glandular and nonglandular trichomes are more numerous per unit area of leaf surface, the epidemic cells are many but more smaller and stomata more numerous per unit area, with guarding cells of smaller dimensions.

Keywords:

Cynara scolymus L, thiophanat-methyl, histo-anatomical modifications, leaf structure.

Code [ID]:

SCSB200712V12S02A0016 [0002495]


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