Relationship of ammonium ion and abscisic acid in bunchstem tissue to the incidence of the disorder bunchstem necrosis in grapevine

B.P. HOLZAPFEL ^[1] ; B.G. COOMBE ^[1]
1. [1] University of Adelaide
  
  University of Adelaide
  
  Australia
Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 3, Nº 3, 1997, págs. 9-14
Idioma: inglés
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Resumen
- Bunchstem tissue from three Cabernet Sauvignon vineyards during three years were analysed for ammonium ion and abscisic acid to test whether their levels correlated with the incidence of the disorder bunchstem necrosis (BSN, Stiellähme). Levels of free ammonium ion, known to be toxic to plant tissue when excessive, were found to be low, considerably lower than those reported in the literature. Neither free nor released ammonium ion levels correlated with BSN incidence. Similarly the levels of abscisic acid, a stress hormone that can induce BSN symptoms when applied to bunches, showed no correlation with BSN incidence.