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The role of gibberellic acid in the hydrolysis of endosperm reserves inZea mays

✍ Scribed by B. M. R. Harvey; Ann Oaks

Publisher
Springer-Verlag
Year
1974
Tongue
English
Weight
467 KB
Volume
121
Category
Article
ISSN
0032-0935

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✦ Synopsis

Excised maize (Zea mays L.) endosperms incubated in buffer rapidly degrade their starch and protein reserves. These processes are not markedly stimulated by addition of gibberellic acid (GA3). However protease and c~-amylase production are strongly inhibited by abseisie acid, and this inhibition can be overcome by exogenous GA 8. Endosperms of a dwarf mutant maize (da), which is deficient in endogenous GA, produce only small amounts of protease and ~-amylase. With these mutants exogenous GA 3 causes a 3-5fold stimulation in hydrolase production. Our interpretation of these results is that in many eases maize endosperms contain sufficient gibberellin to stimulate maximal hydrolase production and starch and protein breakdown.

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A dual rΓ΄le for the endosperm and its galactomannan reserves in the germinative physiology of fenugreek (Trigonella foenum-graecumL.), an endospermic leguminous seed
✍ J. S. Grant Reid; J. Derek Bewley πŸ“‚ Article πŸ“… 1979 πŸ› Springer-Verlag 🌐 English βš– 645 KB

Some 30% of the reserve material in the fenugreek seed is galactomannan localised in the endosperm; the remainder is mainly protein and lipid in the cotyledons of the embryo. The importance of galactomannan to the germinative physiology of fenugreek has been investigated by comparing intact and endo