08.06.2015 Views

Vol. 51—1997 - NorthEastern Weed Science Society

Vol. 51—1997 - NorthEastern Weed Science Society

Vol. 51—1997 - NorthEastern Weed Science Society

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

86<br />

PRO<br />

UCTION PERFORMANCE OF GLYPHOSATE RESISTANT TRANSGENIC<br />

LETTUCE<br />

R T. Nagata, J. A. Dusky, T. A. Bewick, R J. Ferl, and D. 1. Cantliffe'<br />

ABSTRACT<br />

T 0 field trials were conducted to evaluate glyphosate resistance in transformed 'South<br />

Bay' lettu , LactucasativaL. Resistance to the herbicide glyphosate was incorporated into<br />

'South B 'lettuce through the use of Agrobacteriummediated transfer of genetic material.<br />

From app oximately 150 original transformation events, three lines were selected for evaluation<br />

under fiel conditions. Lines designated A-II, B-32 and C-3 were directed seeded into field plots<br />

along wit 'South Bay'. At 3 weeks post sowing the plants were thinned to 12" in row spacing<br />

and plots ere treated with 0.0, 0.0312, 0.125, 0.5, 1.0, 2.0, 4.0, and 8.0 lbs ai/A with glyphosate<br />

in the firs experiment. In the second experiment a treatment of16.0 lbs ai/A was added. Line<br />

B-32 had he highest levels of resistance to glyphosate. Application rates from 0.0 to 8.0 lbs ailA<br />

resulted i no significant differences among mean plant weight. In comparison, plants from line<br />

C-3 were imilar in weight at 0.0312 and 0.125 Ibs ailA application rate, but significantlysmaller<br />

at all othe treatment levels. Line A-II was significantly smaller than B-32 and C-3 for all rates of<br />

glyphosat applications except at 8.0 lbs ailA rate for C-3. Observation of nontreated plots seems<br />

to sugges low field vigor of A-II. Untreated 'South Bay' survived 0.0312 and 0.125 lbs ai/A<br />

applicatio rates, however, plants were small.<br />

soc. Prof and Prof, Everglades Res. & Educ. Ctr., Belle Glade, FL 33430, and Assoc.<br />

Prof, Pr f, and Prof, Univ. of Florida, Horticultural <strong>Science</strong>s Dept., Gainesville, FL 32611.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!