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Relationship of ammonium ion and abscisic acid in bunchstem tissue to the incidence of the disorder bunchstem necrosis in grapevine
Author(s) -
HOLZAPFEL B.P.,
COOMBE B.G.
Publication year - 1997
Publication title -
australian journal of grape and wine research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.65
H-Index - 77
eISSN - 1755-0238
pISSN - 1322-7130
DOI - 10.1111/j.1755-0238.1997.tb00124.x
Subject(s) - abscisic acid , ammonium , incidence (geometry) , necrosis , hormone , horticulture , chemistry , biochemistry , biology , medicine , organic chemistry , optics , gene , physics
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.