Rajasekaran, L. R., Stiles, A. and Caldwell, C. D. 2002. Stand establishment in processing carrots -Effects of various temperature regimes on germination and the role of salicylates in promoting germination at low temperatures. Can J. Plant Sci. 82: 443-450. The effects of various temperature regimes on carrot seed germination and the possibility of hastening germination at a low temperature using salicylates were studied. Seeds were incubated at various temperatures viz., 25, 20, 15, 10, 5 and 2°C. Salicylates such as, 2,6-dihydoxybenzoic acid (DHBA), acetylsalicylic acid (ASA), salicylic acid (SA) were supplied at 0, 1, 10, 100 and 1000 mg L -1 continually to the seeds incubated at 25 and 5°C until germination. Data on germination percentage were collected, and vigor value was calculated. Incubating seeds at various low temperature regimes significantly and proportionately reduced germination percentage and vigor value. The highest cumulative germination and vigor value was observed at 25°C. Critical threshold temperature for germination (GT 50 ) was 5°C. Seed treatment using salicylates hastened germination at 5°C. 2,6-dihydoxybenzoic acid 1, ASA 100 and SA 1 mg L -1 all were effective in hastening germination at 5°C. Among all the salicylates, ASA 100 mg L -1 was the most effective in advancing germination at 5°C. Salicylates at the highest concentration of 1000 mg L -1 inhibited germination significantly both at 25 and 5°C.
BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
Individual 3-gal taxus plants were sprayed on 20 Sep, using a Burgess hand-pump sprayer. Plants were kept outside and were exposed to the following rainfall (inches) before the trial was run: 23 Sep (0.25), 25 Sep (0.03), 26 Sep (0.40) and 1 Oct (0.01). In this trial, BVW were caged in 8-oz styrofoam cups with a clear Telan petri dish top. A 3-inch taxus sprig was placed in a 0.75-inch (diam) plug of Florists Oasis Block as a moisture source. There were 4 weevils/cage, and 5 cages/treatment. Treated taxus sprigs were placed in the cages 1 Oct (11 DAT). Twigs were changed after 24 h, and replaced with untreated foliage for 24 h. Ratings (3 Oct) were taken after the 24 h exposure on untreated foliage to evaluate weevil recovery and fecundity. The BVW were then caged on treated foliage (now 13 DAT) for 48 h. Feeding (damage) and egg counts were taken at this time (5 Oct). Feeding was evaluated by counting the number of notched needles regardless of the number of notches, and dividing by the number of apparently active weevils at that time.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.