Net Carbon Exchange Rate of Fragaria Species, Synthetic Octoploids, and Derived Germplasm

Abstract

<jats:p>The net carbon exchange rate (NCER) of <jats:italic>Fragaria</jats:italic> species, synthetic octoploids [SO (interspecific hybrids)], F<jats:sub>1</jats:sub> (SO × cultivar), and first outcross [OC1 (F<jats:sub>1</jats:sub> × cultivar)] hybrids were evaluated in both field and greenhouse conditions. Plants were grown in a field trial at the Elora Research Station in Ontario, Canada, for one season and then plants were dug and moved into a greenhouse where the trial was repeated during the next season. Single leaf photosynthesis measurements and light response curves were generated at different stages of plant development. Photosynthetic capacity of the species was related to the ecological background of the species with sun-adapted species having higher rates compared with the shade-adapted species. The <jats:italic>Fragaria</jats:italic> species and introgressed hybrids (F<jats:sub>1</jats:sub> and OC1) had significantly higher NCERs compared with the cultivars with rates 28% and 23% higher, respectively. Species and hybrids also appear to have increased adaptability to both high and low light conditions. These increases in NCER may be a heterotic effect because NCER of the hybrids were consistently higher compared with the midparent values and in some cases, they were higher than the high parent. These results suggest that the introgression of lower-ploidy <jats:italic>Fragaria</jats:italic> species into the cultivated strawberry (<jats:italic>Fragaria</jats:italic> ×<jats:italic>ananassa</jats:italic>) may lead to increased NCER and light adaptability.</jats:p>

Climate change increases net CO2assimilation in the leaves of strawberry, but not yield

“…Wild species of strawberry, including F. chiloensis, F. virginiana, F. moschata, F. nilgerrensis and F. vesca have higher net CO 2 assimilation than commercial strawberry (Cameron & Hartley, 1990;Fallahi et al, 2000;Hancock et al, 1989;Harbut et al, 2010Harbut et al, , 2012. Gao et al (2017) found that the diploid F. pentaphylla had higher gas exchange than the tetraploid F. moupinensis in China, S1.…”