Leaf gas exchange and stable carbon isotope composition of redbay and avocado trees in response to laurel wilt or drought stress

Carbon isotope discrimination and water use efficiency in interspecific Prunus hybrids subjected to drought stress

“…Moreover, significant correlations have also been found between δ 13 C and SWP 11:00 (r = − 1.00, − 0.93 and − 0.98 in 6-5, 7-7 and G × N, respectively), and between δ 13 C and WUE (r = 0.96, 0.99 and 0.98 in 6-5, 7-7 and G × N, respectively). All these correlations confirm what has been observed by other authors in peach (Arndt et al, 2000), and in other tree species (Gaudillère et al, 2002;DaMatta et al, 2003;Bielsa et al, 2018;Maier et al, 2019;Castillo-Argaez et al, 2020;Diefendorf et al, 2021). Grouping the three hybrids together and comparing all the values of δ 13 C with those of C i /C a (Fig.…”

“…Water use efficiency (WUE), defined as the ratio between fixed carbon and transpired water, is an important physiological trait relevant for plant adaptation to drought (Walker et al, 2015;Avramova et al, 2019;Castillo-Argaez et al, 2020;Diefendorf et al, 2021). During drought stress, plants with a higher WUE are expected to be more tolerant and, possibly, to achieve higher productivity, either in terms of biomass produced per unity of surface or per plant (Scartazza et al, 1998;DaMatta et al, 2003;Cernusak et al, 2013;Ingwers et al, 2021).…”

“…Using genotypes with higher WUE may increase the efficiency of irrigation under well-watered conditions and that of rainfall use under rainfed environments (Cabuslay et al, 2002). Genotypic variation in WUE has been reported in many tree species, such as Eucalyptus (Osorio et al, 1998), Castanea (Lauteri et al, 1997), Quercus (Ponton et al, 2001), Pistacia (Esmaeilpour et al, 2016), Pinus (McDowell et al, 2010), Populus (Maier et al, 2019), Picea (Duan et al, 2011), apple (Liu et al, 2012), redbay tree and avocado (Castillo-Argaez et al, 2020), and Juniperus (Diefendorf et al, 2021). However, the use of WUE as a physiological index is hampered by the difficulty in taking measurements, especially under field conditions.…”

Use of Semiochemicals for the Management of the Redbay Ambrosia Beetle

“…[ 28 ]. Host response studies during the host-pathogen interaction of laurel wilt disease development are limited [ 12 , 28 , 29 , 30 , 31 , 32 , 33 ]. Time-series studies using electron microscopy of avocado have demonstrated that vascular disruption begins 14 days after fungal inoculation when blockage of vessels occurs (tylosis and presence of gums and gels) [ 32 ].…”

“…A comparison of laurel wilt responses among avocado cultivars showed significantly lower sapflow, water use efficiencies, carbon assimilation, stomatal conductance of H 2 O, and transpiration in infected vs. mock-infected plants 15 days post-inoculation [28]. Recent work by Adams [29] and Castillo-Argaez [30] confirm with physiological evidence and biochemical analyses that sapflow and transpiration are reduced very early, volatile organic compound production is dramatically altered (within the first few days following infection), and host defense responses are not dependent on extensive pathogen colonization of host tissues.…”