Use of chlorophyll a fluorescence in screening for herbicide susceptibility in several Nicotiana tabacum L. cultivars and breeding lines

Possible differential sensitivity of newly released tobacco cultivars to different herbicides must be determined, as possible unfavourable combinations could exist which may have large financial implications in terms of cultivars bred, herbicide and tobacco line combinations used, and concentrations in which the herbicide should be applied if the former combination is compatable. The use of chlorophyll fluorescence measurements, as possible screening parameters to indicate herbicide-induced pertubations, was evaluated in five newly released tobacco cultivars and five breeding lines in combination with six herbicides at two different localities. Statistically, highly significant (p < 0.01) positive correlations were found to exist between the herbicide used, the tobacco cultivar and/or the breeding line to which it was applied, the change in the Fo and FV/FM fluorescence parameters, and yield. A change in the Fo fluorescence level seemed to indicate that a statistically significant deviation in yield might...

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