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Title: The effect of rain and agronomy on seed dormancy and quality of winter cereals
Author: Soleimani, Mohammadreza
ISNI:       0000 0004 7227 4043
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2016
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Variation in agronomy and crop production environment often have interactive effects on cereal seed dormancy and seed and grain quality, possibly by effects on canopy temperature, seed size, or grain drying rate. The effect of rain, nitrogen (N) fertilizer, and fungicide on seed dormancy, grain quality and subsequent seedling growth of winter cereals was studied in three field experiments. Dormancy was released during seed development and maturation in barley, rye and triticale (2012) but released and then re-imposed in wheat (2012 and 2013). Dormancy release was stimulated in barley, rye and triticale, but not wheat, when crops were sheltered from rain in the field. Alpha-amylase activity was reduced and Hagberg falling number (HFN) increased by rain shelter in barley and wheat; HFN was associated positively with grain drying rate in barley and rye. Dormancy release in wheat was stimulated by fungicide application but delayed by early N. The latter increased sulphur and protein concentrations, HFN, and sodium dodecyl sulphate sedimentation volume. This effect was greater when fungicide and/or late N application were also applied. Fungicide improved subsequent seedling growth in wheat in 2012 only. Plumule and root length and dry weight were associated positively with seed size in both years. It is proposed that rain and N fertilizer delayed dormancy release through an indirect effect on grain drying rate and/or canopy temperature, whereas fungicide stimulated dormancy release by reducing grain surface fungal colonies. As expected, rain reduced but N fertilizer increased HFN, but treatment effects on grain drying rate and/or seed size could not account for all these effects on HFN. Fungicide increased subsequent seedling growth indirectly by increasing seed size in addition to a direct effect of fungicide on reducing infection on seedlings, but only when crop disease pressure was high (2012, not 2013).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available