Final grain weight is not limited by the activity of key starch-synthesising enzymes during grain filling in wheat
| Autor: | Laure C David, Brendan Fahy, Alison M. Smith, Hamad Siddiqui, Philippa Borrill, Stephen J. Powers, Cristobal Uauy |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Starch Triticum aestivum Grain weight Plant Science 01 natural sciences 03 medical and health sciences chemistry.chemical_compound wheat Landrace Food science Sugar Water content landrace starch synthesis grain development chemistry.chemical_classification biology Maturity (sedimentology) grain weight food and beverages Research Papers Field crop 030104 developmental biology Enzyme chemistry Wheat biology.protein Starch synthesis Grain development Sink (computing) Starch synthase Photosynthesis and Metabolism 010606 plant biology & botany |
| Zdroj: | Journal of Experimental Botany, 69 (22) Journal of Experimental Botany |
| ISSN: | 1460-2431 0022-0957 |
| DOI: | 10.3929/ethz-b-000323469 |
| Popis: | Since starch is by far the major component of the mature wheat grain, it has been assumed that variation in the capacity for starch synthesis during grain filling can influence final grain weight. We investigated this assumption by studying a total of 54 wheat genotypes including elite varieties and landraces that were grown in two successive years in fields in the east of England. The weight, water content, sugars, starch, and maximum catalytic activities of two enzymes of starch biosynthesis, ADP-glucose pyrophosphorylase and soluble starch synthase, were measured during grain filling. The relationships between these variables and the weights and starch contents of mature grains were analysed. Final grain weight showed few or no significant correlations with enzyme activities, sugar levels, or starch content during grain filling, or with starch content at maturity. We conclude that neither sugar availability nor enzymatic capacity for starch synthesis during grain filling significantly influenced final grain weight in our field conditions. We suggest that final grain weight may be largely determined by developmental processes prior to grain filling. Starch accumulation then fills the grain to a physical limit set by developmental processes. This conclusion is in accord with those from previous studies in which source or sink strength has been artificially manipulated. Journal of Experimental Botany, 69 (22) ISSN:1460-2431 ISSN:0022-0957 |
| Databáze: | OpenAIRE |
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