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Enhancement of ABA responsiveness in wheat embryos by high temperature * †
Author(s) -
WALKERSIMMONS M.
Publication year - 1988
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1988.tb01161.x
Subject(s) - abscisic acid , germination , dormancy , embryo , seed dormancy , wheat grain , biology , embryonic stem cell , botany , horticulture , agronomy , microbiology and biotechnology , biochemistry , gene
. Mature wheat ( Triticum aestivum L.) grain often possesses high‐temperature dormancy which restricts the grain from germinating at warm temperatures (25–30°C). Isolated embryos from such grain exhibited little high‐temperature dormancy when germinated in water. Dormancy was restored by the application of abscisic acid (ABA) to the embryos. The ability of ABA to block germination in isolated embryos was enhanced significantly by elevating the germination temperature. ABA was 100 times more effective in reducing embryonic germination at 30°C than at 15°C. These temperature effects on embryonic response to ABA are a useful system for studying the mechanism of ABA action in seed dormancy.