Journal Article

Involvement of Cyanogens in the Promotion of Germination of Cocklebur Seeds in Response to Various Nitrogenous Compounds, Inhibitors of Respiratory and Ethylene

Yohji Esashi, Akiko Maruyama, Satoshi Sasaki, Akinobu Tani and Makoto Yoshiyama

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 4, pages 545-549
Published in print June 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a028978
Involvement of Cyanogens in the Promotion of Germination of Cocklebur Seeds in Response to Various Nitrogenous Compounds, Inhibitors of Respiratory and Ethylene

More Like This

Show all results sharing these subjects:

  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

GO

Show Summary Details

Preview

Nitrogenous inhibitors of respiration, namely, KCN, NaN3 and NH2OH, which promote the germination of cocklebur (Xanthium pennsylvanücum Wallr.) seeds, enhanced the accumulation of cyanogenic compounds. Urea and cyanamide, which were ineffective, did not. Part of the exogenously applied KCN was converted to cyanogenic glycosides and lipids, but these compounds were only produced at low levels in NaN3-treated seeds. Exposure to NH2OH caused a slight accumulation of both types of cyanogenic compounds. Thiourea, effective in stimulating germination, did not increase the cyanogenic compounds, which suggests that the mechanism of its effect on germination is different from that of other nitrogenous compounds. Thiocyanate had a slightly promotive effect and caused minor increases in the levels of cyanogenic compounds.

Ethylene increased the metabolic utilization of the accumulated cyanogens in response to KCN or NaN3. The response to ethylene of seeds in secondary dormancy was restored only after pre-treatment with KCN or NaN3. The response occurred once the level of cyanogens had increased. By contrast, enhancement of the effects of KCN and NaN3 on germination by propyl gallate or benzohydroxamate, inhibitors of CN-resistant respiration, was accompanied by the increased accumulation of cyanogens within the seeds that had been exposed to KCN or NaN3 in combination with the other types of respiratory inhibitors. Thus, it is suggested that endogenous cyanogens might be involved in the germination of cocklebur seeds.

Keywords: Cocklebur; Cyanogen; Ethylene; Respiration inhibitor; Seed germination

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.