Wheat Phosphorus Availability: 1—In VitroStudy; Factors Affecting Endogenous Phytasic Activity and Phytic Phosphorus Content

✍ Scribed by Barrier-Guillot, Bruno; Casado, Paula; Maupetit, Pierre; Jondreville, Catherine; Gatel, François; Larbier, Michel

• Book ID: 102647639
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 534 KB
• Volume: 70
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/(sici)1097-0010(199601)70:1<62::aid-jsfa465>3.0.co;2-m

✦ Synopsis

Phytasic activity and phytic P content, which are important factors in determining the availability of P, were measured in 56 wheat samples. The different agronomic and genetic factors which could have an influence on these two variables were studied, specifically N and/or P fertilisation, date of harvest, preharvest sprouting and variety of French wheat. Phytasic activity ranged from 206 to 775 mU g-', with an average of 508 mU g-' and a standard deviation of 109 mU g-l. Only the variety of wheat appeared as a significant factor explaining the endogenous phytasic activity ( P = 0.006). The phytic P content varied between 0.92 and 2.80 g kg-' DM, with an average of 2.18 g kg-' and a standard deviation of 0.35 g kg-' DM. None of the factors studied significantly affected the phytic P content of the wheat. This content was correlated with the total P content (r = 0.56; P < 0.05). The activity of the endogenous phytase was independent of the quantity of its substrate, the phytic phosphorus of the kernels of wheat.