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Conditioning period, CO~2~ and GR24 influence ethylene biosynthesis and germination of Striga hermonthica by Abdel Gabbar T. Babiker; Yongqing Ma; Yukihiro Sugimoto; Shinobu Inanaga is a Agricultural and Biological Sciences article available to read on EtoBox.

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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, CO~2~ 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 CO~2~ 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‐fold 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 to conditioning in GR24, did not induce ethylene. However, seeds conditioned in GR24 and then given 1 m__M__ ACC produced 293 nl l^−1^ ethylene. ACC oxidase (ACCO) activity in crude extracts was increased by conditioning and CO~2~. The enzyme displayed an absolute requirement for ascorbate. Absence of exogenous Fe^2+^ reduced enzyme activity only by 14%. GR24 applied

Who reads Conditioning period, CO~2~ and GR24 influence ethylene biosynthesis and germination of Striga hermonthica?

Author

Abdel Gabbar T. Babiker; Yongqing Ma; Yukihiro Sugimoto; Shinobu Inanaga

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

2000

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)