Acid Phosphatases and Seed Shriveling in Triticale

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Abstract
Seed shriveling in the man-made intergeneric hybrid triticale appears to be related to increase activity of endosperm acid phosphatase including p-nitrophenyl phosphatase, ATPase, ADPase, phosphatidic phosphatase and glucose-1-phosphatase that occur specifically at later stages of seed development. Thse hydrolases may reduce endogenous substrates for starch synthesis, deplete energy supply for maintenance and biosynthesis of tissue growth and deassemble membrane structures resulting in a partially filled endosperm and localized necrosis. Electrophoretic isozyme patterns of endosperm acid phosphatase exhibited distinctive differences between lines producing plump and shriveled seeds indicating a diverent role of the isozymes in these 2 different seed conformations.