Morphological and Physiological Effects of Maleic Hydrazide on Tobacco

Abstract

Tobacco plants (Nicotiana tabacum cv. Burley 21) were cultured in the greenhouse to the 18‐leaf stage. The apical meristem was removed and subsequent axillary bud growth was removed by hand (controls) or axillary bud development was inhibited by application of maleic hydrazide. Compared with the controls, maleic hydrazide treated plants had a decreased stem diameter and stem weight, but an increased leaf weight and leaf weight/area. Plant height and leaf area were the same for both treatments. Maleic hydrazide inhibited translocation of 14C from a single leaf exposed to 14CO2. Respiration was greater than in the controls three days after application of maleic hydrazide, but 9 and 14 days after application there were no differences in respiration between the two treatments. Maleic hydrazide did not affect photosynthetic activity.

Effect of different suckrecides on the yield of tobacco (Nicotiana tabacum L)

“…Effect of different o suckericides on fresh weight of leaves, weight of cured leaves and yield (leaves) of utilization of plant nutrients by the leaves in chemical desuckering. These finding are in close conformity with the finding ofQahar et al 2006 andBush andSims, 1974. They observed the application of suckericides on leaf area of tobacco.…”

Effect of Maleic Hydrazide Application on Accumulation of Tobacco-Specific Nitrosamines in Air-Cured Burley Tobacco

“…Maleic hydrazide ( ), 1,2-dihydro-3,6-pyridazinedione, is a systemic plant growth regulator which has been the most effective and most extensively used sucker control agent for tobacco in the United States (Hawks and Collins, 1983). The mode of action of MH in plants is not clear, but several hypotheses have been proposed and studied (Baker, 1961;Hoffmann and Parups, 1964;Coupland and Pell 1971;Bush and Sims, 1974). Since MH application results in higher equilibrium moisture, decreased nicotine and nitrate, increased sugar and potassium when compared to a conventional hand-suckered control (Chaplin, 1967;Steffens et al, 1969;USDA, 1980;Seltmann and Nichols, 1984;Cui et al, 1995), it may have some effects on TSNA formation.…”

Applied Uses of Growth Substances — Growth Inhibitors

“…Even though the mode of action of MH has been studied for nearly 30 years, the biochemical events through which it affects plant development are still not well understood (7)(8)(9)12). Soon after MH was found to be an effective plant growth inhibitor, it was shown to inhibit cell division.…”