University of Tasmania
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Greater propensity to photosynthesize enables superior grain quality of Indica–japonica hybrid rice under shading

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journal contribution
posted on 2023-05-21, 16:25 authored by Shang, C, Matthew HarrisonMatthew Harrison, Deng, J, Ye, J, Zhong, X, Wang, C, Tian, X, Huang, L, Ke LiuKe Liu, Zhang, Y
Indica–japonica hybrid rice (I–JR) typically has greater grain yield than that of Indica hybrid rice (IR) under prolific shading, but it is not known how shading impacts on physiological characteristics underpinning grain quality. Here, we conducted a two-year field experiment in the mid-reaches of the Yangtze River region using I–JR (genotypes Yongyou 1540 and Yongyou 538) and IR (genotypes Y-liangyou 900 and Quanyouhuazhan). We found that shading reduced grain appearance and quality, particularly milling and heading rates, and chalkiness. Shading disrupted carbon and nitrogen metabolism, impacting traits influencing the human perception of the taste of the grain, such that amylose decreased by 5.9% (I–JR) and 12.9% (IR); grain protein significantly increased, with lesser effects in I–JR than IR under shading. Shading also reduced peak, hot, and final viscosities, and breakdown value. I–JR had improved rice quality compared with that of IR due to the greater propensity of the former to photosynthesize under shading, leading to the improved functioning of carbon and nitrogen metabolism.

Funding

Grains Research & Development Corporation

History

Publication title

Agronomy

Volume

13

Article number

353

Number

353

Pagination

1-14

ISSN

2073-4395

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

MDPI AG

Place of publication

Switzerland

Rights statement

© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/).

Repository Status

  • Open

Socio-economic Objectives

Climate change adaptation measures (excl. ecosystem); Climate variability (excl. social impacts); Rice