Site-specific, genotypic and temporal variation in photosynthesis and its related biochemistry in wheat (Triticum aestivum)

Dehigaspitiya, Prabuddha and Milham, Paul and Martin, Anke ORCID: https://orcid.org/0000-0003-3572-7931 and Ash, Gavin and Gamage, Dananjali and Holford, Paul and Seneweera, Saman (2021) Site-specific, genotypic and temporal variation in photosynthesis and its related biochemistry in wheat (Triticum aestivum). Functional Plant Biology, 49 (2). pp. 115-131. ISSN 1445-4408

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Abstract

Photosynthesis in wheat pericarps may contribute appreciably to wheat grain yield. Consequently, we investigated the temporal variation of traits related to photosynthesis and sucrose metabolism in the pericarps and flag leaves of three wheat genotypes, Huandoy, Amurskaja75 and Greece 25, that are reported to differ in expression of genes related to the C4 pathway in wheat grain. Significant site-specific, genotypic and temporal variation in Vcmax and Jmax were observed early in ontogeny that dissipated by late grain-filling. Although the transcript abundance of rbcS and rbcL in flag leaves was significantly higher than in the pericarps, in line with their photosynthetic prominence, both organ types displayed similar expression patterns among growth stages. The higher N concentrations in the pericarps during grain enlargement suggest that the increased Rubisco; however, expression of rbcS and rbcL indicated the contrary. From heading to 14 dpa, wheat pericarps exhibited a strong, positive correlation between biological capacity for carbon assimilation and expression of key genes related to sucrose metabolism (SPS1, SUS1 and SPP1). The strong correlation between spike dry weight and the biological capacity for carbon assimilation along with other findings of this study suggest that metabolic processes in wheat spikes may play a major role in grain filling, total yield and quality.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 01 Feb 2022 00:20
Last Modified: 02 Feb 2022 05:48
Uncontrolled Keywords: biological capacity of carbon assimilation; grain filling; Jmax; source and sink interaction; spike gas exchange; sucrose metabolism; transcript abundance; Vc max
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300404 Crop and pasture biochemistry and physiology
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280101 Expanding knowledge in the agricultural, food and veterinary sciences
Identification Number or DOI: https://doi.org/10.0171/FP21111
URI: http://eprints.usq.edu.au/id/eprint/45476

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