The effect of isoproturon on root growth and ultrastructure of the photosynthetic apparatus of two wheat cultivars and a weed
Year: 1986
Type: article
Abstract: The effect of isoproturon [N,N‐dimethyl N′4‐(1‐methyl‐ethyl) phenyl urea] on the germination, growth of root and ultrastructure of the photosynthetic apparatus was investigated in two wheat cultivars (Triticum sativum L. cvs Castan and Esquilache) and a weed (Lolium rigidum Gaud.). No inhibition of germination was apparent in any of the three plants studied. The inhibition of root growth was considerably significant, especially in cv. Esquilache. After 48 h treatment with isoproturon (340 μM), the chloroplasts of the two wheat cultivars were found to be similar, showing a higher number of grana with fewer thylakoids per granum (lower stacking degree), broader grana stacks than in the control and an absence of starch. However, after 60 h of treatment, swelling of the thylakoids occurred in the Esquilache cultivar. The rye grass was the most affected by the herbicide; at low concentration (3.4 μM) the number and size of the grana decreased considerably and the stroma thylakoids were destroyed. At higher concentration (17 μM), there was a strong accumulation in certain areas of the stroma of a substance with a lipid‐like appearance, probably derived from the disintegrating thylakoids. At the same concentrations some chloroplast envelopes were completely desintegrated. The Hill reaction of the three plants exhibited a similar sensitivity towards the herbicide.
Source: Physiologia Plantarum
Institution: Universidad Autónoma de Madrid
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2001573714