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BIOLOGICAL EFFECTS OF A HERBICIDE ON A NITROGEN‐FIXING CYANOBACTERIUM (BLUE‐GREEN ALGA): AN ATTEMPT FOR INTRODUCING HERBICIDE‐RESISTANCE
Author(s) -
VAISHAMPAYAN A.
Publication year - 1984
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1984.tb03537.x
Subject(s) - heterocyst , mutant , chemistry , cyanobacteria , nitrogen , botany , carbon source , nitrogen fixation , biology , biochemistry , bacteria , gene , genetics , nitrogenase , organic chemistry
S ummary The herbicide monuron [3‐(4‐chlorophenyl)‐1, 1‐dimethylurea] inhibits growth and heterocyst formation in the nitrogen‐fixing cynobacterium Nostoc muscorum . These inhibitory effects are glucose‐reversible in both N 2 (nitrogen‐free) and NO 3 − media. A spontaneous mutant of this cyanobacterium, resistant to a dose of monuron normally applied to the rice‐fields of North India, has been isolated and preliminarily characterized as having no requirement for an organic carbon source for its normal physiology under monuron‐treated conditions. The behaviour of the mutant has been tentatively explained as resulting from a permeation mutation preventing monuron entry into N. muscorum.