Premium
Differential Phytotoxic Reaction of Sorghum Cultivars to Insecticides. I. Genetic Resistance to Trichlorfon 1
Author(s) -
RiccelliMattei Mauricio
Publication year - 1971
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1971.0011183x001100060048x
Subject(s) - biology , sorghum , cultivar , backcrossing , allele , panicle , phytotoxicity , locus (genetics) , gene , genotype , genetics , botany , agronomy , horticulture
The application of trichlorfon (dimethyl trichlorohydroxyethyl phosphonate) to susceptible genotypes of sorghum ( Sorghum bicolor L. Moench) caused marked phytotoxic reaction and even death under field conditions at Maracay, Venezuela. In the plants that survived new growth appeared normal, but panicles were sometimes injured. Backcross F 2 , and F 3 populations from crosses among susceptible and resistant cultivars evidenced the genetic control of a single locus, with resistance recessive to susceptibility. Data from reciprocal crosses ruled out the existence of maternal effects. The presence of modifying genes that can accumulate and reduce the expression of phytotoxicity was suggested in certain crosses. Gene symbols Dtp for susceptibility and dtp for resistance were used for the trait. These alleles appeared randomly distributed among sorghum cultivars. The two characters, awned florets and reaction to trichlorfon, are inherited independently.