التفاصيل البيبلوغرافية
| العنوان: |
Mutational breeding for low-phytate barley grain. |
| المؤلفون: |
Rasmussen, Søren K., Legzdina, Linda, Fan, Weiyao |
| المصدر: |
Cereal Research Communications; 2017 Supplement S1, Vol. 45, p7-8, 2p |
| مصطلحات موضوعية: |
BARLEY, PLANT breeding, PHYTIC acid |
| مستخلص: |
Understanding the biosynthesis and accumulation of phytic acid (PhA) in seeds is of primary importance to minimize the release of phosphate to the environment caused by the inability of monogastric animals to hydrolize PhA. Today, feed is either supplemented with inorganic phosphate or treated with phytase in order to provide sufficient phosphate for the animals. As phosphate is one of the limited and non-renewable resources on earth, and a shortage of quality phosphate is foreseen within this century, it is important to develop barley and rice varieties which accumulate less organic phosphate in the form of PhA thereby reducing the amount of non-metabolized phosphate that pass through the ecosystem. Another issue is that PhA as an anti-nutritional factor is related to the term "hidden hunger", which is a result of living on a mineral-poor diet consisting solely of cereals as staple food. The minerals bound by PhA in barley and rice are immobilized and thus will not contribute as a source to retain a healthy diet. Breeding for low PhA level cereals will improve the health of many people around the world and as a feed improve the cereal based phosphate contribution. PhA is a naturally occurring polyphosphorylated carbohydrate and has for a long time been known as a storage compound for phosphorus (P) in seeds but it is ubiquitous in eukaryotic organisms and is typically the most abundant inositol phosphate in cells. In plants, PhA is present in most tissues, including pollen, spores, and vegetative tissue such as roots, tubers, stems and leaves, and it has been implicated in many cellular processes. The negatively charged phosphate groups in PhA have a strong chelating effect on metal ions and in plants PhA is mainly found as salt-complexes with cations such as K+, Mg2+, Ca2+, Mn2+, Zn2+ and Fe3+. PhA accounts for 50-80% of the total phosphorus content of the seed and contributes up to 1.5% of the seed dry weight. However besides its function as a storage compound and signaling molecule, the regulatory network of inositol-phosphate metabolism is not well understood. The identification and functional elucidation of two new promising genes, mutation of which results in low phytic acid (lpa) mutant phenotype (Hvlpa5-1, Hvlpa6-1) in barley, have been mapped to barley chromosome 4H and differ from all known lpa genes previously reported. Importantly no negative impact on agronomics traits was observed for the two lpa mutants, which are thus in sharp contrast to most other reported lpa mutants, suggesting they are of great potential for breeding lpa varieties. Results from breeding and field trial in Latvia and Denmark and of GWAS studies will be presented. [ABSTRACT FROM AUTHOR] |
|
Copyright of Cereal Research Communications is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Find this article in full text from Springer Verlag.