[Effect of preparations exhibiting cytokinin-like activity on the specific density of leaf in grasses].
The effects of synthetic preparations exhibiting cytokinin-like activity (6-benzylaminopurine, Thidiazuron, and kartolin-2) on the specific leaf area (SLA) were studied in plants of the family Gramineae (wheat, Triticum aestivum L.; meadow fescue, Festuca pratensis Huds.; and reed fescue, F. arindinacea Schreb.). At the early stages of ontogeny (until the leaf area reached 50-60% of the maximum value), treatment of plants of the three species with cytokinin-like preparations caused an increase in SLA. The SLA value in these plants was correlated with the rate of photosynthetic assimilation of carbon dioxide and activities of carbon metabolism enzymes: ribulose-1,5-bisphosphate carboxylase/oxygenase (EC 4.1.1.39), NAD-malate dehydrogenase (EC 1.1.1.37), and NADP-glyceraldehydrophosphate dehydrogenase complex, which includes phosphoglycerate kinase (EC 2.7.2.3) and glyceraldehydrophosphate dehydrogenase (EC 1.2.1.13). However, there was no correlation of SLA with the activity of phospho(enol)pyruvate carboxylase (EC 4.1.1.31), an anaplerotic carboxylation enzyme of grasses. SLA is suggested to reflect the state and activity of the photosynthetic apparatus and can be recommended as a characteristic of photosynthesis variability (e.g., caused by cytokinin-like preparations).
Cherniad'ev
I I
II
Bach Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia. inbio@glas.asp.ru
D000225:Adenine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*; D001593:Benzyl Compounds; D002219:Carbamates / Q000737:chemistry / Q000494:pharmacology*; D002245:Carbon Dioxide / Q000378:metabolism; D003583:Cytokinins / Q000494:pharmacology*; D031751:Festuca / Q000187:drug effects / Q000254:growth & development; D024581:Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating) / Q000378:metabolism; D007701:Kinetin; D008291:Malate Dehydrogenase / Q000378:metabolism; D010671:Phenylurea Compounds / Q000138:chemical synthesis / Q000494:pharmacology*; D010735:Phosphoglycerate Kinase / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000737:chemistry / Q000187:drug effects; D006109:Poaceae / Q000187:drug effects* / Q000254:growth & development; D011687:Purines; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism; D013830:Thiadiazoles; D014908:Triticum / Q000187:drug effects / Q000254:growth & development
D001593:Benzyl Compounds; D002219:Carbamates; D003583:Cytokinins; D010671:Phenylurea Compounds; D011687:Purines; D013830:Thiadiazoles; C016785:thidiazuron; C068790:kartolin 2; D002245:Carbon Dioxide; D008291:Malate Dehydrogenase; D024581:Glyceraldehyde-3-Phosphate Dehydrogenase (Phosphorylating); D010735:Phosphoglycerate Kinase; D012273:Ribulose-Bisphosphate Carboxylase; D000225:Adenine; C480551:benzylaminopurine; D007701:Kinetin