The effect of fluridone and flurochloridone on the incidence of albinism in pea (Pisum sativum) and on the abscission of leaves of privet (Ligustrum vulgare)

Abstract

The effect of fluridone (or flurochloridone), the inhibitor of carotenoid, chlorophyll and abscisic acid synthesis, on the abscission of Ligustrum vulgare leaves was investigated. Both forms of fluridone inhibited the abscission of petioles when they were applied as a 1.0% concentration in lanolin to the leaf blade. Fluridone was capable of inhibiting abscission even when it was applied to the petiole as late as 7 hours after the blade was cut off. Fluridone applied in lanolin to the apical part of intact pea seedlings or on the cut surface after decapitation of the epicotyl caused albinism of the stipules. The degree of albinism decreased according to the concentration of applied flurodine (from the highest -0.5% to the lowest -0.03%) and was higher in intact than in decapitated plants. Albinism also appeared in pea seedlings grown from seeds swollen in differently concentrated solutions of flurochloridone, particularly in the basal part of the shoots. Complete albinism occurred only in plants cultivated from seeds swollen in high concentrations (0.06-0.12%). The lowest concentration (0.007%) stimulated root growth of the pea seedlings, but inhibited epicotyl growth.

Influence of abscisic acid and fluridone on the content of phytohormones and polyamines and the level of oxidative stress in plants of Mesembryanthemum crystallinum L. under salinity

“…The growth rate of plants, leaf surface area and water con tent, and the expression of ABA associated genes in different genotypes strongly correlated with the con tent of ABA (Sharp et al, 2012). Under stress condi tions ABA can be synthesized quickly from caro tenoids through xanthoxin, accumulated and inacti vated rapidly into phaseic acid and then into di hydro phaseic acid, which provides a reversible process that can be completely normalized after reducing the con centration of ABA (Klí ová et al, 2002).…”

“…The mechanism of action of fluridone is based on inhibition of the bio synthesis of carotenoids at the stage of phytic desatu rase (Edivaldo et al, 2010). It has been shown that treatment of plants with fluridone leads to inhibition of the synthesis of carotenoids, ABA, and, particularly, to albinism of plants, which is associated with subse quent photooxidation of chlorophyll (Popova, 1995;Klí ová et al, 2002).…”

Comparative evaluationin vitroof the herbicide flurochloridone by cytokinesis-block micronucleus cytome and comet assays

“…Flurochloridone is a selective herbicide widely applied around the world, including in Argentina, and used to control many broadleaf weeds and annual grasses in several crops. Flurochloridone interferes with carotenoid biosynthesis, causing bleaching of the leaves (Lay and Niland,; Klíčová et al,). According the European Food Safety Authority (EFSA), flurochloridone has no genotoxic, carcinogenic, or neurotoxic potential and it is unlikely to be genotoxic (EFSA,).…”

Are All Paraphyllia the Same?

“…To make sure that it is the presence of ABA that causes changes in the morphogenesis of paraphyllia, we used a test with fluridone, an ABA biogenesis inhibitor (Popova, 1995;Klıčováet al, 2002;Velini et al, 2010;Shu et al, 2017) that may reduce the content of the free form of ABA by up to 40% (Stetsenko et al, 2015). Fluridone (Sigma, Germany) at a concentration of 15 mmol was applied in 1 ml quantities to Leskea cultivated with ABA and without it.…”