Site-specific, genotypic and temporal variation in photosynthesis and its related biochemistry in wheat (Triticum aestivum)
Article
Article Title | Site-specific, genotypic and temporal variation in photosynthesis and its related biochemistry in wheat (Triticum aestivum) |
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ERA Journal ID | 2590 |
Article Category | Article |
Authors | Dehigaspitiya, Prabuddha (Author), Milham, Paul (Author), Martin, Anke (Author), Ash, Gavin (Author), Gamage, Dananjali (Author), Holford, Paul (Author) and Seneweera, Saman (Author) |
Journal Title | Functional Plant Biology: an international journal of plant function |
Journal Citation | 49 (2), pp. 115-131 |
Number of Pages | 17 |
Year | 2021 |
Place of Publication | Australia |
ISSN | 1445-4408 |
1445-4416 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/FP21111 |
Web Address (URL) | https://www.publish.csiro.au/fp/FP21111 |
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. |
Keywords | biological capacity of carbon assimilation; grain filling; Jmax; source and sink interaction; spike gas exchange; sucrose metabolism; transcript abundance; Vc max |
ANZSRC Field of Research 2020 | 300404. Crop and pasture biochemistry and physiology |
Byline Affiliations | Centre for Crop Health |
University of Western Sydney | |
University of Ruhuna, Sri Lanka | |
Western Sydney University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6y2v/site-specific-genotypic-and-temporal-variation-in-photosynthesis-and-its-related-biochemistry-in-wheat-triticum-aestivum
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