Addition of branched-chain amino acids can reverse propyrisulfuron-induced acetolactate synthase (ALS) and growth inhibition in three rice cultivars and five weed species

Issue Date

12-2015

Abstract

Propyrisulfuron is a new pyrimidinylsulfonylurea herbicide with a fused heterocyclic moiety. Similar to older sulfonylureas, propyrisulfuron inhibits the activity of acetolactate synthase (ALS), the enzyme involved in branched-chain amino acid synthesis. Previous studies have shown that ALS activity, and consequently, the growth of susceptible plants was inhibited when treated with propyrisulfuron. This study was conducted to determine whether or not the addition of branched chain amino acids to the growth medium will alleviate the inhibition of ALS activity and the growth of propyrisulfuron-treated rice and weeds. Visual assessment of injury, shoot height, shoot biomass, in vivo ALS activity and ALS content showed that addition of 100 mg L-1 valine, isoleucine and leucine significantly reversed ALS inhibition and resulted in recovery from ALS and growth inhibition of the propyrisulfuron-treated rice and weeds. Recovery of the weeds, which were more susceptible than rice, was more pronounced than that of rice. Addition of all three amino acids resulted in greater reversal of ALS inhibition and better recovery compared with addition of only two amino acids.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

0031-7454

Volume

98

Issue

4

Page

351-361

Document Type

Article

Physical Description

illustrations, tables, graphs, diagram

Language

English

Subject

Acetolactate synthase, Cyperus iria, Echinochloa colona, Echinochloa crus-galli, Leptochloa chinensis, Ludwigia hyssopifolia, Propyrisulfuron, Rice

Digital Copy

yes

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