Plants are constantly trying to balance the trade<\/span>–<\/span>off between carbon gain through CO2 uptake and the cost of water loss through stomata. Recently, more focus has been given to modelling <\/span>this interaction, with the idea that a plant will control its stomatal<\/span> response in such a way to <\/span>make the maximum profit between carbon gain and hydraulic cost. The gain<\/span>–<\/span>risk model <\/span>proposes that plants will maximize production (photosynthetic gain) with increased water loss <\/span>(hydraulic cost) when water is readily available. S<\/span>perry et al. (2017) further developed the <\/span>model proposing that the hydraulic cost should be defined as the risk of hydraulic failure due <\/span>to embolism formation during drought. The gain<\/span>–<\/span>risk model has been tested on multiple <\/span>species; however, this model has<\/span> not been tested on Eucalyptus, a commercially significant <\/span>species, at plant scale during drought and drought recovery. A wide range of water<\/span>–<\/span>use and <\/span>drought strategies has been observed within Eucalyptus, including hydraulic recovery post<\/span>–<\/span>drought. This stu<\/span>dy, therefore, tested the gain<\/span>–<\/span>risk model on Eucalyptus hybrids during drought <\/span>and drought recovery. The gain<\/span>–<\/span>risk model performed well in both E. grandis<\/em> X camaldulensis <\/em><\/span>(GC) and E. urophylla<\/em> X grandis<\/em> (UG). Two distinct strategies were, however, observed <\/span>between the two hybrids based on their stomatal and hydraulic responses. UG showed a more <\/span>resilient<\/span> strategy<\/span> where<\/span> stomatal<\/span> conductance<\/span> was<\/span> maintained<\/span> during<\/span> drought,<\/span> with <\/span>maintenance of carbon uptake but increased risk of hydraulic failure. GC utilized a<\/span> resistant <\/span>strategy, tightly regulating stomatal conductance reducing water loss, however sacrificing <\/span>carbon gain through CO2 uptake. The gain<\/span>–<\/span>risk model performed better at predicting stomatal <\/span>responses for GC during short periods of drought, compared to<\/span> UG. This highlighted the <\/span>importance of understanding water use strategies, as plants utilizing a resilient strategy can <\/span>maintain gas exchange regardless of the risk of hydraulic failure on which the gain<\/span>–<\/span>risk model <\/span>is based. It is clear that the water<\/span>–<\/span>use<\/span> strategies of plants should be considered when <\/span>modelling stomatal responses. Given that the intensity and frequency of drought events are <\/span>likely to shift due to climate change, modelling plant responses to a changing climate is vital, <\/span>and the gain<\/span>–<\/span>risk mod<\/span>el shows promise as a process<\/span>–<\/span>based approach in this cont<\/span><\/span>ext.<\/p><\/blockquote>\n<\/blockquote>\n[:]<\/p>\n","protected":false},"excerpt":{"rendered":"
[:en] Alta Saunders attended the Sixth international conference on Plant Vascular Biology (held from July 17th to 21st) in Berlin, Germany (https:\/\/www.pvb2022.org\/abstract-book\/). She presented a poster on her research entitled \u201cModelling drought responses of Eucalyptus using photosynthetic gain and hydraulic risk\u201d. The poster can…<\/p>\n","protected":false},"author":10084,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1520","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/posts\/1520","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/users\/10084"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/comments?post=1520"}],"version-history":[{"count":0,"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/posts\/1520\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/media?parent=1520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/categories?post=1520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.sun.ac.za\/eucxylo\/wp-json\/wp\/v2\/tags?post=1520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}