Proanthocyanidins – a final frontier in flavonoid research?

New Phytologist - Tập 165 Số 1 - Trang 9-28 - 2005
Richard A. Dixon1, De‐Yu Xie1, S. B. Sharma1
1Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, Oklahoma 73401, USA

Tóm tắt

SummaryProanthocyanidins are oligomeric and polymeric end products of the flavonoid biosynthetic pathway. They are present in the fruits, bark, leaves and seeds of many plants, where they provide protection against predation. At the same time they give flavor and astringency to beverages such as wine, fruit juices and teas, and are increasingly recognized as having beneficial effects on human health. The presence of proanthocyanidins is also a major quality factor for forage crops. The past 2 years have seen important breakthroughs in our understanding of the biosynthesis of the building blocks of proanthocyanidins, the flavan‐3‐ols (+)‐catechin and (–)‐epicatechin. However, virtually nothing is known about the ways in which these units are assembled into the corresponding oligomers in vivo. Molecular genetic approaches are leading to an understanding of the regulatory genes that control proanthocyanidin biosynthesis, and this information, together with increased knowledge of the enzymes specific for the pathway, will facilitate the genetic engineering of plants for introduction of value‐added nutraceutical and forage quality traits. Contents Summary 9 I. Introduction 9 II. Sources and structures of proanthocyanidins 10 III. Functions of proanthocyanidins in the plant 12 IV. Proanthocyanidins and plant quality traits 13 V. Flavanols, proanthocyanidins and human health 14 VI. Biosynthesis of proanthocyanidins 16 VII. Genetic manipulation of the proanthocyanidin pathway 23 VIII. Conclusions and future prospects 24 Acknowledgements 25 References 25

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New Phytologist

Tập 165 Số 1

9-28

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