PMID: 16664503Nov 1, 1985Paper

Enzyme activities of starch and sucrose pathways and growth of apical and Basal maize kernels

Plant Physiology
T M Ou-Lee, T L Setter

Abstract

Apical kernels of maize (Zea mays L.) ears have smaller size and lower growth rates than basal kernels. To improve our understanding of this difference, the developmental patterns of starch-synthesis-pathway enzyme activities and accumulation of sugars and starch was determined in apical- and basal-kernel endosperm of greenhouse-grown maize (cultivar Cornell 175) plants. Plants were synchronously pollinated, kernels were sampled from apical and basal ear positions throughout kernel development, and enzyme activities were measured in crude preparations. Several factors were correlated with the higher dry matter accumulation rate and larger mature kernel size of basal-kernel endosperm. During the period of cell expansion (7 to 19 days after pollination), the activity of insoluble (acid) invertase and sucose concentration in endosperm of basal kernels exceeded that in apical kernels. Soluble (alkaline) invertase was also high during this stage but was the same in endosperm of basal and apical kernels, while glucose concentration was higher in apical-kernel endosperm. During the period of maximal starch synthesis, the activities of sucrose synthase, ADP-Glc-pyrophosphorylase, and insoluble (granule-bound) ADP-Glc-starch synthase we...Continue Reading

References

Dec 1, 1976·Biochemical Genetics·P S Chourey, O E Nelson
Mar 1, 1969·Archives of Biochemistry and Biophysics·D B Dickinson, J Preiss
Oct 15, 1980·Archives of Biochemistry and Biophysics·C Pollock, J Preiss
Aug 1, 1970·Plant Physiology·C Y TsaiO E Nelson
May 1, 1971·Plant Physiology·T A Jaynes, O E Nelson

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Citations

May 14, 2003·Ecotoxicology and Environmental Safety·A Umamaheswari, K Venkateswarlu
Nov 1, 1990·Plant Physiology·G W SingletaryF E Below
Apr 9, 2019·Journal of Food Science and Technology·Penta PristijonoJohn B Golding

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