Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768994
Title: Film antitranspirant application to enhance spring drought tolerance of oilseed rape (Brassica napus L.)
Author: Faralli, Michele
ISNI:       0000 0004 7656 1787
Awarding Body: Harper Adams University
Current Institution: Harper Adams University
Date of Award: 2017
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Abstract:
Oilseed rape (OSR) is an important crop worldwide and drought occurring during reproduction is the main limitation on yield. Following the recent problems in breeding new drought tolerant OSR varieties, there is potential for agronomic exploitation of film antitranspirant (AT) application to avoid yield losses. The main objectives of this study were i) to evaluate whether AT application during OSR r eproductive stages may sustain yield under drought; ii) to elucidate the physiological mechanisms behind the potential AT- induced yield mitigation; iii) to explore the apparent physiological inconsistency between the old and the new work on AT. In four glasshouse experiments and two field experiments drought conditions were applied at different phenological stages and OSR plants were sprayed with different AT chemicals. Three experiments were carried out on OSR seedlings in growth chambers under different atmospheric CO 2 concentration, drought conditions and sprayed or not with AT. The data showed physiological amelioration and yield loss mitigation from application of 1% v/v (glasshouse) and 1 L ha -1 (field) of a commercially -available AT (Vapor Gard) jus t prior to flowering (GS 6.0) on droughted OSR . The AT application under drought triggered complex physiological mechanisms, collectively leading to a sustained photosynthetic rate, reductions in ABA concentration, improved leaf water status and therefore sustaining pod and, to a greater extent, seed production. In addition, the data show that increasing the atmospheric CO 2 concentration does not have an ameliorative effect on OSR seedling's drought tolerance. On the contrary, the experiments showed that in recent years the increased atmospheric CO 2 concentration may have counteracted the source- limiting effect of AT following increasing substrate available at the site of carboxylation, therefore leading to higher potential efficiency of AT chemicals under w ater -limited conditions. To conclude, AT may deserve further investigation as a potential and flexible management tool to counteract drought damage to OSR yield.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.768994  DOI: Not available
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