Some Anatomical and Cytological Responses of Barley to Maleic Hydrazide

Gifford, Ernest M.

doi:10.1002/j.1537-2197.1956.tb10467.x

Cited by 13 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mode of action of maleic hydrazide in plants is not known, but hypotheses proposed include (a) inhibition and/or stimulation of respiration, (b) inhibition of mitosis, (c) antiauxin activity, (d) stimulator and/or antagonist to IAA, and (e) disruption of vascular function. The most evident morphological effect of maleic hydrazide is a general stunting of plants (Gifford 1956, Greulach and Haesloop 1954, Mcllrath 1950, Naylor and Davis 1950. This conclusion was based on observations with plants which have the apical meristem intact.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Effects of Maleic Hydrazide on Tobacco

Bush

Sims

1974

Physiologia Plantarum

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Effects of Maleic Hydrazide on Tobacco

Bush

Sims

1974

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…Mil al the appropriate concentration inhibits cell division in plants (3, 11. 13, l(i, 18, 30, 31); however, Ihere is still some uncer- 12 16 20 Z4 TIME hours 1 tiiinty about its effects on cell enlargement especially tbat induced by auxin (1,G" 7,8,9,10. II.…”

Section: Resultsmentioning

confidence: 99%

“…While the inbihilion of cell division is certainly very important, it may not account for all tbe developmental aberrations such as inhibilion ol cell enlargement and Ihe eifects on phloem wbicb bave been observed to result from treatment with MH (3,8,11,29,30,31). MH bas been shown to cause defects in tbe pbloem afler exptJsures wbicb are very long compared to those used bere, bul Iliis is probably not the ])rimary mean by wbich MII affects [)ianl development.…”

Section: Resultsmentioning

confidence: 99%

The Mode of Action of Maleic Hydrazide: Inhibition of Growth

Noodén

1969

Physiologia Plantarum

View full text Add to dashboard Cite

Maleic hydrazide (MH) inhibits corn root elongation through an effect on cell division apparently without inhibiting cell enlargement. The decrease in the rate of elongation was apparent only after a considerable lag, over 14 hours, even with a concentration as high as 5 mM. MH (1 mM) did not inhibit His growth of roots from corn seeds given very large doses of γ‐irradiation or excised corn root segments including the elongation Zone or the cell enlargement induced by IAA in corn coleoptile sections. Many compounds including purines, pyrimidines, nucleosides. cysteine, pyridoxal, pyruvate. kinetin and CoCl2, many of which had previously been reported to alleviate MH inhibition in other tissues, were tested for their ability to prevent the inhibition of corn root elongation by MH, but none were effective. These data do not support the theory that MH acts by inhibiting the synthesis of or competing with some simple metabolite or hormone. Whatever its mechanism of action the failure of MH to inhibit cell enlargement in most systems indicates that it is fairly selective.

show abstract

“…At the low concentration used (0.01%) MH is known to be a respiratory inhibitor as well as being primarily a mitotic inhibitor in meristematic plant tissue (Gifford 1956). The dual action of the maleic hydrazide thus served as a useful physiological marker in delineating the positive, linear correlation between the respiratory rate and the rate of increase in cell number/ embryo for both the in vivo and callus conditions.…”

Section: Ultrastructural Studiesmentioning

confidence: 98%