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Sahar Dabirian and Carol A. Miles

The one-cotyledon splice grafting method is commonly used for watermelon (Citrullus lanatus) because it is relatively rapid and there is less rootstock regrowth than with other grafting methods. However, plants must rely on moisture in the air for survival during at least the first 4 days after grafting. In 2015 and 2016, greenhouse experiments were conducted to investigate if application of commercial stomata-coating and stomata-closing antitranspirant products, applied 1 day before grafting to both scion and rootstock seedlings, could increase the survival of watermelon transplants grafted using the one-cotyledon method. ‘TriX Palomar’ watermelon was grafted onto rootstock ‘Tetsukabuto’ (Cucurbita maxima × C. moschata) in Expt. 1, and onto rootstock ‘Emphasis’ (Lagenaria siceraria) in Expt. 2. The survival of grafted watermelon differed because of experiment (P = 0.0003), antitranspirant treatment (P < 0.0001), and experimental repeat (P < 0.0001). The survival of ‘TriX Palomar’ grafted onto ‘Tetsukabuto’ was greatest for plants treated with the stomata-coating + stomata-closing antitranspirants (92% to 100%), followed by the stomata-closing antitranspirant (79% to 97%), water (72%), and the stomata-coating antitranspirant (50% to 60%). For ‘TriX Palomar’ grafted onto ‘Emphasis’, plants treated with the stomata-closing antitranspirant had the greatest survival (87% to 97%), followed by stomata-coating + stomata-closing antitranspirants (84% to 94%), the stomata-coating antitranspirant (50% to 67%), and water (53% to 68%). In Expt. 3, stomatal conductance (g S) was similar for both ‘TriX Palomar’ and ‘Emphasis’ seedlings before treatment application, but differed because of the treatments 1 and 2 days after application. Stomatal conductance did not change for ‘TriX Palomar’ seedlings after application of the stomata-coating antitranspirant or water, or for ‘Emphasis’ seedlings after application of the stomata-coating antitranspirant. Stomatal conductance of ‘TriX Palomar’ seedlings decreased 57% to 62% after application of the stomata-closing antitranspirant and decreased 48% to 60% after application of the stomata-coating + stomata-closing antitranspirants. Stomatal conductance for ‘Emphasis’ seedlings increased 37% after water application, and decreased 58% to 68% after application of the stomata-closing antitranspirant, and decreased 42% to 45% after application of the stomata-coating + stomata-closing antitranspirants. The survival rate of grafted ‘TriX Palomar’ transplants was increased nearly 30% by application 1 day before grafting of the commercial stomata-closing antitranspirant or stomata-coating + stomata-closing antitranspirants in this study. Increase in grafting success is likely due to a reduction in transpiration that occurs when the stomata-closing antitranspirant is applied to the seedlings before grafting.

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Nebahat Sari, Emily Silverman, Danny Reiland, and Todd C. Wehner

susceptible cultigens. USDA–Agricultural Research Service, Plant Genetic Resources and Conservation Unit in Griffin, GA ( http://www.ars-grin.gov ) has more than 235 PIs of Lagenaria siceraria ( Levi et al., 2009 ). In this study, 163 Lagenaria accessions

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Judy A. Thies, Sharon Buckner, Matthew Horry, Richard Hassell, and Amnon Levi

Laboratory, USDA, ARS in Charleston, SC) were selected for use in the experiment. Commercial rootstocks also included in the study were ‘Emphasis’ Lagenaria siceraria , ‘Ojakkyo’ C. lanatus var. citroides , ‘Strong Tosa’ Cucurbita maxima × Cucurbita

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Amnon Levi, Judy A. Thies, Patrick W. Wechter, Mark Farnham, Yiqun Weng, and Richard Hassell

those grafted onto commercial squash ( Cucurbita spp.) or Lagenaria siceraria (bottle gourd) rootstocks ( Thies et al., 2010 , 2012 , 2014 ). Based on these results, we hypothesized that novel tetraploid CLC lines would provide vigorous rootstocks

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Chandrasekar S. Kousik, Jennifer L. Ikerd, Mihir K. Mandal, Scott Adkins, Craig G. Webster, and William W. Turechek

USVL351-PMR (powdery mildew resistant) and USVL482-PMR are bottle gourd ( Lagenaria siceraria ) germplasm lines that exhibit high levels of resistance to the cucurbit powdery mildew (PM) pathogen ( Podosphaera xanthii ) compared with susceptible

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Judy A. Thies, Jennifer J. Ariss, Richard L. Hassell, Sharon Buckner, and Amnon Levi

and Hassell, 2010 ). Squash hybrid ( Cucurbita maxima × C. moschata ) and bottle gourd ( Lagenaria siceraria ) rootstocks are among the most commonly used rootstocks for grafting watermelon and other cucurbits because these species are not

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Yeh-Jin Ahn and Grace Qianhong Chen

seedlings such as in squash ( Cucurbita pepo ; Ananthakrishnan et al., 2003 ), bottle gourd ( Lagenaria siceraria Standl.; Han et al., 2004 ), and an oilseed crop, niger [Guizotia abyssinica (L. f.) Cass.; Murthy et al., 2003 ]. In castor, we used

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Amnon Levi, John Coffey, Laura Massey, Nihat Guner, Elad Oren, Yaakov Tadmor, and Kai-shu Ling

metuliferus accessions were also resistant to PRSV. In a previous study ( Ling and Levi, 2007 ), we identified several Lagenaria siceraria PIs collected in India as resistant to both PRSV-W and ZYMV. These results indicate that resistance to these

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Dario J. Chavez, Eileen A. Kabelka, and José X. Chaparro

resistance to P. capsici in bottle gourd, Lagenaria siceraria Standl. The existence of heterogeneity in our selected germplasm for resistance to P. capsici was analyzed in the S 1 progeny of four resistant plants with DR = 0, PI 211996 (two plants) and

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Michael G. Bausher

has been reported in other grafted plants crop, namely melons. However, in that case, the movement occurred post-grafting and the initial infection was associated with bottlegourd ( Lagenaria siceraria ) rootstock seed infected with Cucumber green