Mechanism of tolerance of blueberry (Vaccinium sp) to hexazinone

Thesis/Dissertation · Mon Dec 31 23:00:00 EST 1984

OSTI ID:6707350

Baron, J J

Hexazinone (3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-trazine-2,4(1H,3H)-dione) was applied as a soil drench to 1-year-old rooted hardwood cuttings of highbush (Vaccinium corymbosum L.) and rabbiteye (V. ashei Reade) blueberry plants. No differences in susceptibility to hexazinone were detected among 10 highbush and 3 rabbiteye cultivars grown in a fine sandy soil. The tolerance of two highbush and two rabbiteye cultivars to hexazinone were studied in low, medium, and high organic matter soils. Hexazinone at 1 or 2 kg/ha had no inhibitory effect on blueberry growth in the high organic matter soil, inhibited growth slightly on the medium organic matter soil, and caused severe injury in the low organic matter soil. Hexazinone toxicity, absorption, translocation, metabolism, and effect on photosynthesis were investigated with highbush and rabbiteye blueberry and goldenrod (Solidago fistulosa Miller), which were growing in hydroponic culture. Highbush and rabbiteye blueberry plants were three times more tolerant to root applications of hexazinone than was goldenrod. Blueberry plants absorbed an average of 7.9% of the root applied /sup 14/C-hexazinone and the goldenrod absorbed an average of 10.1%. An average of 6.8% of the root absorbed hexazinone (/sup 14/C-label) was translocated from the root system of the blueberry plants to stem and leaves. Radioactivity in the goldenrod plants was equally distributed between the roots and shoots. The majority of the radioactivity in blueberry and goldenrod plants was recovered in the form of hexazinone. Root absorbed hexazinone caused a rapid inhibition of photosynthesis in intact goldenrod leaves at rates of 10 ..mu..M. Root absorbed hexazinone inhibited photosynthesis in intact blueberry leaves at hexazinone concentrations of 100 ..mu..M.

• Research Organization: North Carolina State Univ., Raleigh (USA)
• OSTI ID: 6707350
• Country of Publication: United States
• Language: English

Related Subjects

553006* -- Agriculture & Food Technology-- Other Agricultural Applications-- (1987-)
60 APPLIED LIFE SCIENCES
BERRIES
BIOLOGICAL EFFECTS
BIOLOGICAL LOCALIZATION
CARBON 14 COMPOUNDS
CHEMICAL REACTIONS
FOOD
FRUITS
HERBICIDES
HYDROPONIC CULTURE
INHIBITION
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
PESTICIDES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
SOILS
SYNTHESIS
TOXICITY
TRACER TECHNIQUES