title: Study of low phytic acid1-7 (lpa1-7), a new ZmMRP4 mutation in maize.
abstract: Phytic acid (PA), myo-inositol 1,2,3,4,5,6-hexakisphosphate, is the main storage form of phosphorus in plants. It is localized in seeds, deposited as mixed salts of mineral cations in protein storage vacuoles; during germination, it is hydrolyzed by phytases. When seeds are used as food/feed, PA and the bound cations are poorly bioavailable for human and monogastric livestock due to their lack of phytase activity. Reducing the amount of PA is one strategy to solve these problems and is an objective of genetic improvement for improving the nutritional properties of major crops. In this work, we present data on the isolation of a new maize (Zea mays L.) low phytic acid 1 (lpa1) mutant allele obtained by chemical mutagenesis. This mutant, named lpa1-7, is able to accumulate less phytic phosphorus and a higher level of free inorganic phosphate in the seeds compared with wild type. It exhibits a monogenic recessive inheritance and lethality as homozygous. We demonstrate that in vitro cultivation can overcome lethality allowing the growth of adult plants, and we report data regarding embryo and leaf abnormalities and other defects caused by negative pleiotropic effects of this mutation.
authors.affiliation: Dipartimento di Produzione Vegetale, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Cerino Badone
authors.forename: Marco
authors.initials: M
authors.lastname: Amelotti
authors.forename: Elena
authors.initials: E
authors.lastname: Cassani
authors.forename: Roberto
authors.initials: R
authors.lastname: Pilu
mesh_terms: D000483:Alleles; D018506:Gene Expression Regulation, Plant; D018525:Germination / Q000235:genetics; D009154:Mutation; D010833:Phytic Acid / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics*; D003313:Zea mays / Q000235:genetics* / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D010833:Phytic Acid