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2 edition of Starch metabolism during embryo development of oilseed rape. found in the catalog.

Starch metabolism during embryo development of oilseed rape.

Paulo Maria Ferreira Rodrigues Da Silva

Starch metabolism during embryo development of oilseed rape.

by Paulo Maria Ferreira Rodrigues Da Silva

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Published by University of East Anglia in Norwich .
Written in English


Edition Notes

Thesis (Ph.D.), University of East Anglia, School of Biological Sciences, 1993.

ID Numbers
Open LibraryOL21712868M

Activity and expression of banana starch phosphorylases during fruit development and ripening. Planta (). daSilva PMFR, Eastmond PJ, Hill LM, Smith AM, Rawsthorne S. Starch metabolism in developing embryos of oilseed rape. In oil-storing Brassica napus(rape) seeds, starch deposition occurs only transiently in the early stages of development, and starch is absent from mature seeds. This work investigates the influence of a reduction of ADP-Glc pyrophosphorylase (AGPase) on storage metabolism in these seeds.

@article{osti_, title = {Modification of starch metabolism in transgenic Arabidopsis thaliana increases plant biomass and triples oilseed production}, author = {Liu, Fushan and Zhao, Qianru and Mano, Noel and Ahmed, Zaheer and Nitschke, Felix and Cai, Yinqqi and Chapman, Kent D. and Steup, Martin and Tetlow, Ian J. and Emes, Michael J.}, abstractNote = {Here, we have identified a novel. In the life cycle of higher plants, seed development is a key process connecting two distinct sporophytic generations. Seed development can be divided into embryo morphogenesis and seed maturation. An essential metabolic function of maturing seeds is the deposition of storage compounds that are mobilised to fuel post-germinative seedling growth. Given the importance of seeds for food and.

The Endosperm Undergoes a Shift from Hexoses to Suc during Development. To enlarge on the understanding gained from Vicia spp. and the growing genetic evidence in Arabidopsis, we measured the sugar composition of the endosperm of oilseed rape seeds during their development. Oilseed rape seeds can easily be dissected into an embryo and an external part consisting of the testa and cellular.   However, extracting RNA at the tissue level enables more detailed studies regarding tissue specific transcriptomes during seed development. Seeds from heart stage embryo to mature developmental stages of Brassica napus and B. oleracea were sampled for isolation of the embryo, endosperm and seed coat tissues.


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Starch metabolism during embryo development of oilseed rape by Paulo Maria Ferreira Rodrigues Da Silva Download PDF EPUB FB2

The aim of this work was to characterise the metabolism of starch in developing embryos of oilseed rape (Brassica napus L. Topaz). Abstract. The aim of this work was to characterise the metabolism of starch in developing embryos of oilseed rape (Brassica napus L. Topaz).

The accumulation of starch in embryos in siliques which were darkened or had been exposed to the light was similar, suggesting that the starch is synthesised from imported sucrose rather than via photosynthesis in the by: • Starch accumulates early during embryo development in Arabidopsis and oilseed rape, then disappears during oil accumulation.

Little is known about the nature and importance of starch metabolism in oilseed by: We have investigated which metabolites are utilized for starch and fatty acid synthesis by plastids isolated from oilseed rape embryos that are accumulating both oil and starch.

A method was developed that was rapid and yielded intact, washed plastids with a very low contamination by the by: 1. Summary The aim of this work was to investigate the capacity for synthesis of starch and fatty acids from exogenous metabolites by plastids from developing embryos of oilseed rape (Brassica napus L.).

A method was developed for the rapid isolation from developing embryos of intact plastids with low contamination by cytosolic enzymes. within the embryo of oilseed rape but also to define their spatial/ temporal relations to those established for the accumulation of starch and storage proteins, cellular growth, photosynthetic activity, and metabolite pattern.

A high metabolic heterogeneity became apparent and was further explored by applying tissue-specific metabolic modeling. oilseed, plant embryo, starch degradation, starch synthesis, glucan, water dikinase (GWD1⁄SEX1). Summary • Starch accumulates early during embryo development in Arabidopsis and oilseed rape, then disappears during oil accumulation.

Little is known about the nature and importance of starch metabolism in oilseed embryos. The antisense repression of starch synthesis in the oilseed rape embryo inhibits Suc import, glycolysis, and respiration and acts as a brake on growth (Vigeolas et al., ).

Starch synthesis thus can be considered as representing a mechanism for creating a sink (Andriotis et al., ) during early embryogenesis, but when space becomes limiting, it is better for the embryo to accumulate lipid rather than starch.

• Starch accumulates early during embryo development in Arabidopsis and oilseed rape, then disappears during oil accumulation. Little is known about the nature and importance of starch metabolism in oilseed embryos.

Abstract: Starch accumulates early during embryo development in Arabidopsis and oilseed rape, then disappears during oil accumulation. Little is known about the nature and importance of starch metabolism in oilseed embryos. This has led to hypothesize a general role of oxygen on the lipid/starch balance during oilseed development in Brassicaceae.

Likewise, the in vivo oxygen distribution in maize kernels favors assimilate partitioning toward starch within O 2 -depleted regions of endosperm while TAGs are stored in well-oxygenated regions at the kernel periphery.

Kang and Rawsthorne showed that several cytosolic metabolites may contribute to starch and/or fatty acid synthesis in the developing embryos of oilseed rape. Starch synthesis and degradation occur simultaneously during B. napus embryo development. Carotenoids are ubiquitous natural pigments derived from isoprenoids.

Abstract. The plastidial phosphoenolpyruvate (PEP)/phosphate translocator (PPT) is expressed in the developing embryos of oilseed rape (Brassica napus L.).PEP can be imported by plastids isolated from embryos and used for fatty acid synthesis at rates that are sufficient to account for one-third of the rate of fatty acid synthesis in provides the first experimental evidence for.

Starch metabolism during embryo development of oilseed rape. Author: Da Silva, Paulo Maria Ferreira Rodrigues. ISNI: Awarding Body: University of East Anglia Current Institution: University of East Anglia Date of Award: Availability of Full Text.

Alison M Smith *Starch accumulates early during embryo development in Arabidopsis and oilseed rape, then disappears during oil accumulation. Little is known about the nature and importance of.

Seed development involves the coordinated growth of maternal seed coat tissues and the enclosed zygotic endosperm and embryo. In oilseed rape and Arabidopsis, it has been demonstrated that the.

The oilseed embryo does not have a starch reserve by this stage of development (da Silva et al., ; Baud et al., ) and it is shown here that the sucrose content remains unchanged from mid-oil synthesis onwards.

Preserving the sucrose content may be important for supporting metabolism in the embryo prior to the breakdown of fatty acids. Abstract. Measurements of metabolic fluxes in whole embryos and isolated plastids have revealed major changes in the pathways of carbon utilization during cotyledon filling by oilseed rape (Brassica napus L.) embryos.

In the early cotyledon stage (stage A), embryos. In cultured oilseed rape embryos, flux through the OPPP accounts for, at most, 22% of the total reductant that is required for fatty acid synthesis (Schwender et al., ).

Although the importance of GPT1 in oilseed embryos is not known, it is vital for normal development and metabolism. Oil, starch, and protein storage reserves in the embryo and endosperm tissues accumulate rapidly after 10 DAP, the period of seed fill. The cessation of seed growth at full development is called physiological maturity and corresponds to the time of maximum dry weight.

Such oilseed rape is the third most important vegetable oil (15% total world production) (Weselake et al., ) and dominates oil production in Northern Europe and Canada (Harwood et al., ).

In order to generate background data, we examined changes in the major acyl lipids of rapeseed embryos during development. Studies suggest that starch does not serve as a carbon storage sink in these plants, but the turnover of starch during oilseed development might be functionally linked to cell division and differentiation and also affects seed maturation processes.

Similar to the pathways in leaf tissue plastids, starch synthesis in embryos uses imported.Oilseed rape (Brassica napus) is one of the leading temperate crops grown as a source of oil, and although much of the global physiology occurring over the course of its seed development is well understood [26–31], little attention has been paid to studying metabolism within specific tissues of the developing seed.

The aim of the present.