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Titolo:
Conditioning period, CO2 and GR24 influence ethylene biosynthesis and germination of Striga hermonthica
Autore:
Babiker, AGT; Ma, YQ; Sugimoto, Y; Inanaga, S;
Indirizzi:
Tottori Univ, Arid Land Res Ctr, Tottori 6800001, Japan Tottori Univ Tottori Japan 6800001 Land Res Ctr, Tottori 6800001, Japan Agr Res Corp, Wad Medani, Sudan Agr Res Corp Wad Medani SudanAgr Res Corp, Wad Medani, Sudan
Titolo Testata:
PHYSIOLOGIA PLANTARUM
fascicolo: 1, volume: 109, anno: 2000,
pagine: 75 - 80
SICI:
0031-9317(200005)109:1<75:CPCAGI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACID; OXIDASE ACTIVITY; CARBON-DIOXIDE; HIGHER-PLANTS; ASIATICA; THIDIAZURON; INDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Sugimoto, Y Tottori Univ, Arid Land Res Ctr, 1390 Hamasaka, Tottori 6800001, Japan Tottori Univ 1390 Hamasaka Tottori Japan 6800001 00001, Japan
Citazione:
A.G.T. Babiker et al., "Conditioning period, CO2 and GR24 influence ethylene biosynthesis and germination of Striga hermonthica", PHYSL PLANT, 109(1), 2000, pp. 75-80

Abstract

Germination of witchweed (Striga hermonthica [Del,] Benth), an important root parasite on poaceous crops, requires pretreatment 'conditioning' in a warm moist environment and a subsequent exposure to a stimulant. The roles of conditioning period, CO2 and a strigol analogue (GR24) in ethylene biosynthesis and germination of the parasite were investigated, Conditioning increased the seeds' capacity to oxidize exogenous 1-aminocyclopropane-1-carboxylic acid (ACC), Exogenous CO2 increased the seeds capacity to oxidize ACC by 3- to 9-fold, A combination of GR24 and ACC increased ethylene production by more than 3-foId in comparison with the rates obtained using these compounds separately. Aminoethoxyvinylglycine (AVG) completely inhibited ethylene induction by GR24, but not by ACC. A GR24 treatment, made subsequent toconditioning in GR24, did not induce ethylene. However, seeds conditioned in GR24 and then given 1 mM ACC produced 293 nl l(-1) ethylene, ACC oxidase(ACCO) activity in crude extracts was increased by conditioning and CO2. The enzyme displayed an absolute requirement for ascorbate. Absence of exogenous Fe2+ reduced enzyme activity only by 14%, GR24 applied during conditioning reduced germination in response to a subsequent GR24 treatment, ACC was, invariably, less effective in inducing S, hermonthica germination than GR24 even at concentrations which induce more ethylene than concurrent GR24 treatments. The results are consistent with a model in which conditioning removes a restriction on the ethylene biosynthetic pathway in S. hermonthicaseeds. GR24 modulates the key enzymes in ethylene biosynthesis. The stimulant suppresses ethylene biosynthesis in unconditioned seeds and promotes itin conditioned ones. Germination of S, hermonthica results from the joint action of GR24 and the ethylene it induces.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/10/20 alle ore 00:44:16