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- W2014230082 abstract "The pedicel-placenta-chalazal (PPCh) region is a heterogeneous maternal tissue located at the base of the endosperm. Its active role in the transport and metabolism of nitrogen compounds supplied to the endosperm has been shown by incorporation of labelled compounds, as well as by analysis of appropriate enzyme activities and the free amino acid pool. Within 30 min incubation, 60–70% of the label given in [14C]aspartate or [14C]glutamate was recovered in the organic acid fraction of the PPCh. Although the dry matter and protein content of the PPCh region was practically unchanged between days 15 and 30 after pollination, glutamate transaminase, alanine transaminase, NADP-malic enzyme and NAD-malate dehydrogenase were increased substantially. The PPCh region contains glutamine at a significantly higher concentration and alanine at a lower concentration than the endosperm. In contrast to glutamate synthase, the activity of glutamine synthetase per endosperm and per mg protein is significantly higher in the PPCh region. This implies involvement of these tissues in the transport of nitrogen compounds, mainly in the form of glutamine, as well as possible compartmentation of the glutamine-glutamate cycle in the developing maize kernel." @default.
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- W2014230082 date "1985-01-01" @default.
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- W2014230082 title "Amino acid metabolism in the pedicel-placenta-chalazal region of the developing maize kernel" @default.
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- W2014230082 doi "https://doi.org/10.1016/s0031-9422(00)80740-2" @default.
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