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RESEARCH ARTICLE

Genotypic variability of grain phytic acid, mineral bioavailability, and their relation to foliar Zn application

Da Su https://orcid.org/0000-0003-3597-0640 A B , Muhammad Atif Muneer B , Yuanyang Cai https://orcid.org/0000-0003-1231-3111 B , Muhammad Abu Bakar Saddique C and Fangmin Cheng D *
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

B College of Resources and Environment, International Magnesium Institute, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

C Institute of Plant Breeding and Biotechnology, Muhammad Nawaz Shareef University of Agriculture Multan, 60000, Pakistan.

D College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, Zhejiang, China.

* Correspondence to: chengfm@zju.edu.cn

Handling Editor: Shahid Hussain

Crop & Pasture Science 73(5) 461-472 https://doi.org/10.1071/CP21510
Submitted: 30 June 2021  Accepted: 7 September 2021   Published: 21 December 2021

© 2021 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Phytic acid (PA) is the most prevalent storage form of grain phosphorus (P) and acts as an anti-nutrient by lowering mineral bioavailability. Genotypic variation of grain PA and its relation to mineral bioavailability, and their nutritional fortification potential with zinc (Zn) supply has not been fully investigated in pigmented rice. Here, we compared the differences in grain PA concentration and mineral bioavailability among 13 pigmented rice (red, yellow, and green rice) and six non-pigmented rice cultivars (three common white rice and their corresponding low-PA (lpa) mutant). Pigmented rice was enriched with micronutrients, especially Zn and Fe, on an average of 39.1 and 44.8 mg kg−1 as compared with 31.9 and 33.1 mg kg−1 in non-pigmented rice respectively. The lpa cultivars showed the highest bioavailability for most of the minerals. However, no significant difference was observed for mineral bioavailability between pigmented and common white rice, owing to higher anti-nutritional PA in pigmented rice (9.25 g kg−1) than in common white rice (8.29 g kg−1). However, a large difference in grain PA was found among green rice (11.19 g kg−1), yellow rice (9.82 g kg−1) and red rice (8.56 g kg−1) cultivars. Therefore, foliar Zn was used to investigate PA concentration and Zn bioavailability. Foliar Zn application increased grain Zn but decreased grain PA concentration, which ultimately increased grain Zn bioavailability. Zn application had a remarkable effect on Zn bioavailability for red rice (an average of 82%) as compared with common white rice (48%). These findings could provide helpful knowledge for pigmented rice fortification.

Keywords: calcium, foliar zinc application, iron, magnesium, mineral bioavailability, pigmented rice, phytic acid, trivariate model.


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