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Plant function and evolutionary biology
RESEARCH ARTICLE

Integrative physiological and transcriptome analyses elucidate the effect of shading during the grain-filling stage of wheat (Triticum aestivum) cv. ZY96-3

Tao Li A B # , Muhammad Arif A B # , Zhongni Wang C , Guanyin Shi A B , Lulwah Zeyad Aljumaiah D , Ling Xu A B , Mingjian Ren A B , Ruhong Xu A B * and Luhua Li https://orcid.org/0000-0002-6212-2105 A B *
+ Author Affiliations
- Author Affiliations

A College of Agriculture, Guizhou University, Guiyang 550025, China.

B Guizhou Sub-center of National Wheat Improvement Center, Guiyang 550025, China.

C Guizhou Rice Research Institute, Guizhou Academy of Agricultural Science, Guiyang 550006, China.

D Department of Biological Sciences, College of Sciences, University of Ha’il, Ha’il 2440, Saudi Arabia.

* Correspondence to: xrhgz@163.com, luhua_li@163.com

# These authors contributed equally to this paper

Handling Editor: Sajid Fiaz

Functional Plant Biology 52, FP25013 https://doi.org/10.1071/FP25013
Submitted: 12 January 2025  Accepted: 25 March 2025  Published: 8 April 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Shading plays an important role in determining nutrient content and yield fo wheat (Triticum aestivum). However, the genetic mechanism underlying the effects of shading treatment on grain filling remains unclear. Therefore, we performed phenotypic and transcriptome analyses on wheat cv. ZY96-3 during grain development under normal and shaded conditions. Shading resulted in a significant decrease in grain size and 1000-grain weight. Correlation analysis revealed the strong effect of shading on the mean and maximum grain-filling rate and secondary grain-filling parameters R2 and R3. And shading reduced starch content and starch-related enzyme activity (including granule-bound starch synthase and soluble starch synthase). Transcriptomic analyses showed that shading mainly affected pathways related to photosynthetic antenna proteins, carbon fixation in photosynthetic organisms, and starch and sucrose metabolism. Sixteen genes related to photosynthetic antenna protein and carbon fixation pathways were first upregulated and then downregulated; whereas all differentially expressed genes (PetC, Fd, LFNR1, LFNR2, PC, PsbO, PsaG, and PSB28) in the photosynthetic antenna protein pathway belonged to electron transport chain proteins. We found that shading treatment affects the physiological and molecular properties of grain development during the grain-filling stage. This study reveals new candidate genes (such as TaLFNR1-7A and TaFd-7A) for breeding wheat varieties with high photosynthetic efficiency in regions with insufficient light intensity.

Keywords: carbon fixation, differentially expressed genes, grain filling, photosynthesis, shading, transcriptomic analysis, wheat, yield.

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