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WheatHub Student Webinar Series: Abdel El Habti
Sep 9, 2020, 3:30 pmFree
The ARC Industrial Transformation Research Hub for Wheat in a Hot and Dry Climate will be releasing an online Showcase event highlighting the work of the centre in October 2020. In the run up to the Showcase event, we are pleased to announce a series of research seminars given by our current and former PhD students. This webinar series showcases the excellent science our students have undertaken in last 5 years.
This seminars will be given by Abdel El Habti at 3.30pm on the 9th September 2020. See below for more details of Abdel’s talk.
Registration for the webinar is required. After registering, you will receive a confirmation email containing information about joining the webinar. If you are unable to attend, the webinar will be recorded and will be available as part of the online Showcase in October.
Webinar title: Investigating carbohydrate availability, plant water use and oxidative stress as potential indicators of tolerance to combined drought and heat stress
Drought and high temperatures commonly occur simultaneously in wheat growing regions and greatly challenge wheat production. Recent research shows that plant response to multiple stresses is unique and cannot be extrapolated from plant response to individual stresses. Little is known about wheat physiology under the combination of drought and heat stress.
In my PhD project, we identified carbohydrate availability, plant water use and oxidative stress as potential indicators of tolerance to combined drought and heat stress. We found that glucose and fructose concentrations in grains measured 12 days after anthesis were associated with total grain weight at harvest. Three-day heat stress differentially affected transpiration response to vapour pressure deficit, immediately reducing daily water use in some genotypes while other genotypes were able to maintain water use.
We found that water flow to the spike, used as a surrogate for transpiration in the spike, was not reduced by drought and heat stress, unlike leaf transpiration, which suggested differential regulation of transpiration under stress depending on the transpiring organ. Visualisation of xylem embolism in wheat plants confirmed that the peduncle was more resistant to embolism than the flag leaf, which could be a protective mechanism of the reproductive organ under stress. Finally, we tested a method to monitor oxidative stress in vivo using optical fibres.