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Ovule cell wall composition is a maternal determinant of grain size in barley.
Yang, Xiujuan; Wilkinson, Laura G; Aubert, Matthew K; Houston, Kelly; Shirley, Neil J; Tucker, Matthew R.
Afiliación
  • Yang X; Waite Research Institute, School of Agriculture, Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia.
  • Wilkinson LG; Waite Research Institute, School of Agriculture, Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia.
  • Aubert MK; Waite Research Institute, School of Agriculture, Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia.
  • Houston K; Australian Grain Technologies, 100 Byfield Street, Northam, WA, 6401, Australia.
  • Shirley NJ; The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK.
  • Tucker MR; Waite Research Institute, School of Agriculture, Food and Wine, The University of Adelaide, Urrbrae, SA, 5064, Australia.
New Phytol ; 237(6): 2136-2147, 2023 03.
Article en En | MEDLINE | ID: mdl-36600397
In cereal species, grain size is influenced by growth of the ovule integuments (seed coat), the spikelet hull (lemma and palea) and the filial endosperm. Whether a highly conserved ovule tissue, the nucellus, has any impact on grain size has remained unclear. Immunolabelling revealed that the barley nucellus comprises two distinct cell types that differ in terms of cell wall homogalacturonan (HG) accumulation. Transcriptional profiling of the nucellus identified two pectin methylesterase (PME) genes, OVULE PECTIN MODIFIER 1 (OPM1) and OPM2, which are expressed in the unfertilized ovule but absent from the seed. Ovules from an opm1 opm2 mutant and plants expressing an ovule-specific pectin methylesterase inhibitor (PMEI), exhibit reduced HG accumulation. This results in changes to ovule cell size and shape and ovules that are longer than wild-type (WT) controls. At grain maturity, this is manifested as significantly longer grain. These findings indicate that cell wall composition during ovule development acts to limit ovule and seed growth. The investigation of ovule PME and PMEI activity reveals an unexpected role of maternal tissues in controlling grain growth before fertilization, one that has been lacking from models exploring improvements in grain size.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Hordeum / Grano Comestible Tipo de estudio: Prognostic_studies Idioma: En Revista: New Phytol Asunto de la revista: BOTANICA Año: 2023 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Hordeum / Grano Comestible Tipo de estudio: Prognostic_studies Idioma: En Revista: New Phytol Asunto de la revista: BOTANICA Año: 2023 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido