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Article

Exogenous Treatments to Enhance Splice-Grafted Watermelon Survival

1
Northwestern Washington Research & Extension Center, Department of Horticulture, Washington State University, Mount Vernon, WA 98273, USA
2
Hermiston Agricultural Research and Extension Center, Department of Horticulture, Oregon State University, 2121 South 1st Street, Hermiston, OR 97838, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Federica Caradonia
Horticulturae 2021, 7(7), 197; https://doi.org/10.3390/horticulturae7070197
Received: 28 June 2021 / Revised: 14 July 2021 / Accepted: 14 July 2021 / Published: 16 July 2021
(This article belongs to the Special Issue Grafting to Improve Yield and Quality of Vegetable Crops)
This study evaluated the use of splice grafting as a propagation strategy for watermelon. In experiment 1, the treatments consisted of sucrose, antitranspirant A, antitranspirant B, auxin (indole-3-butyric acid (IBA)) at two concentrations (10 and 20 mg·L−1), plus a water control. The survival (%) of splice-grafted watermelon plants differed due to the number of days after grafting and treatment (p < 0.0001, for both). At 21 days after grafting, plants treated with sucrose and antitranspirant A, and sucrose and antitranspirant A with 10 mg·L−1 auxin had 90% and 88% survival, respectively, whereas the graft survival was 18% for plants treated with water. Experiment 2 included the three top performing treatments from experiment 1 and a water control treatment, applied to both root-intact and root-excised rootstocks. There was a significant difference in survival (%) of splice-grafted watermelon due to root treatments, exogenous treatments, and the number of days after grafting (p < 0.0001, for all). At 21 days after grafting, survival for root-excised grafted plants was 11% lower compared to root-intact plants. Plants treated with sucrose and antitranspirant A, and sucrose and antitranspirant A with 10 mg·L−1 auxin had 87% and 86% survival, respectively, whereas plants treated with water had 14% survival. The external application of auxin applied to rootstock seedlings does not appear to be cost-effective; however, other products should be evaluated. View Full-Text
Keywords: auxin; abscisic acid; carbohydrate; cotyledon; root-excision; rootstock regrowth auxin; abscisic acid; carbohydrate; cotyledon; root-excision; rootstock regrowth
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MDPI and ACS Style

Devi, P.; DeVetter, L.W.; Lukas, S.; Miles, C. Exogenous Treatments to Enhance Splice-Grafted Watermelon Survival. Horticulturae 2021, 7, 197. https://doi.org/10.3390/horticulturae7070197

AMA Style

Devi P, DeVetter LW, Lukas S, Miles C. Exogenous Treatments to Enhance Splice-Grafted Watermelon Survival. Horticulturae. 2021; 7(7):197. https://doi.org/10.3390/horticulturae7070197

Chicago/Turabian Style

Devi, Pinki, Lisa Wasko DeVetter, Scott Lukas, and Carol Miles. 2021. "Exogenous Treatments to Enhance Splice-Grafted Watermelon Survival" Horticulturae 7, no. 7: 197. https://doi.org/10.3390/horticulturae7070197

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