Soil and foliar zinc biofortification of broccolini: effects on plant growth and mineral accumulation
Angelica Rivera-Martin A , Martin R. Broadley B and Maria J. Poblaciones
A B C
+ Author Affiliations
- Author Affiliations
A Department of Agronomy and Forest Environment Engineering, University of Extremadura, Avenida Adolfo Suárez s/n, 06007, Badajoz, Spain.
B School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, United Kingdom.
C Corresponding author. Email: majops@unex.es
Crop and Pasture Science 71(5) 484-490 https://doi.org/10.1071/CP19474
Submitted: 18 November 2019 Accepted: 26 March 2020 Published: 13 May 2020
Abstract
Millions of people have Zn-deficient diets, so Zn-biofortified crops could prevent such deficiency. The aim of this study was to evaluate the use of agronomic Zn biofortification of broccolini – a new hybrid crop variety derived from a cross between kalian cabbage and broccoli. Plants were grown in pots using a Zn deficient soil. Four fertiliser treatments were tested: (1) control; (2) soil application of 5 mg ZnSO4•7H2O kg–1 soil; (3) foliar application at the early flowering stage of 0.5% (w/v) ZnSO4•7H2O; (4) combined soil and foliar treatments. Florets were harvested in four sequential harvests. There was a decrease in both growth and leaf composition of Zn, Ca, Fe and Mg. Soil Zn application increased floret production. There were increases in the Zn concentration stem+leaves and florets of 12- and 2.5-fold in foliar and soil+foliar treatments respectively. PA:Zn molar ratios decreased under both foliar and soil+foliar treatments. Boiling reduced Zn concentration by 40%, along with a decrease of other mineral nutrients. A soil+foliar treatment can increase both plant growth and Zn concentration in broccolini, and boiled 100 g portion of biofortified florets fertilised at rates in this study would deliver ~49 mg Zn, a 46% increase than in the non-biofortified broccolini.
Additional keywords: bioavailability, Brassica, nutrient uptake, phytate, zinc.
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