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PHYTOALEXINS, WATER‐STRESS AND STOMATA
Author(s) -
PLUMBE ALISON M.,
WILLMER C. M.
Publication year - 1985
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1985.tb02834.x
Subject(s) - vicia faba , pisum , phytoalexin , sativum , water stress , botany , biology , distilled water , turgor pressure , horticulture , chemistry , biochemistry , chromatography , resveratrol
S ummary There are certain features shared by phytoalexins (which can be loosely defined as microbial stress compounds) and water‐stress compounds such as ABA. Therefore, a study was made to determine if phytoalexins behaved in a similar fashion to water‐stress compounds and in this report phytoalexin accumulation in water‐stressed leaves was investigated. Phytoalexins were not detected in mildly water‐stressed leaf tissue of Pisum sativum L. or Vicia faba L. However, if plants were severely water‐stressed resulting in damaged and dead areas in their leaves, a fungitoxic substance corresponding to pisatin was detected in the damaged areas of pea leaves and, to a lesser extent, in areas which recovered full turgor, while a number of fungitoxic substances, two of which corresponded to wyerone and wyerone acid, occurred in the damaged and recovered areas of V. faba leaves. Thus, although phytoalexins may accumulate in severely water‐stressed leaves they do not apparently behave in a similar manner to water‐stress compounds such as ABA which would be expected to accumulate in leaves even under mild water‐stress.