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CONTROL OF REGENERATION IN ROOTS OF THE DEEP‐ROOTED WEED CHONDRILLA JUNCEA L.
Author(s) -
CASO O. H.,
KEFFORD† N. P.
Publication year - 1973
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1973.tb01259.x
Subject(s) - picloram , shoot , chemistry , chlormequat , auxin , weed , chloride , regeneration (biology) , botany , biology , biochemistry , organic chemistry , gene , microbiology and biotechnology
Summary. A system was developed for testing the ability of herbicides applied to the shoots of the deep‐rooted weed Chondrilla juncea to inhibit the regeneration of buds on serial sections along the root. Auxin herbicides known to inhibit regeneration when applied directly to root sections and with a potential for translocation or slow metabolic conversion to an active auxin were selected for testing. The most effective herbicides tested were picloram, N ‐(diethylaminomethyl)‐2,4‐dichlorophenoxyacetamide and 2,4‐dichlorophenoxy‐acet‐ O ‐methylhydroxamic acid. Each compound reduced bud formation along 40 cm of root. The inhibition of regeneration by the sodium salt of 2,4‐D was decreased at temperatures above 25°C. The growth retardants chlormequat chloride, chlorphonium chloride and B‐995 were tested as inhibitors of regenerated‐bud growth and emergence when applied to shoots; only B‐955 was inhibitory. Amitrole and tris‐(laziridinyl) phosphine oxide inhibited bud formation and growth. Suppression de la régénération par les racines de Chondrilla juncea L., mauvaise herbe à encrainement profond.