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Khin Thida One, Narathid Muakrong, Chamnanr Phetcharat, Patcharin Tanya and Peerasak Srinives

success in obtaining the interspecific hybrids without further pursuit. In this study, we made interspecific crosses between tall-erect J. curcas and dwarf-spreading J. integerrima and obtained several F 1 , F 2 , BC 1 F 1 , and BC 1 F 2 plants. The

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Susan M. Hawkins, John M. Ruter and Carol D. Robacker

). However, hybridization readily occurs between species of Baptisia ( Alston and Turner, 1963 ; Baetcke and Alston, 1968 ; Dement and Mabry, 1975 ; Larisey, 1940 ; Leebens-Mack and Milligan, 1998 ). In the genus Baptisia , interspecific crosses have

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Juan M. Osorno, Carlos G. Muñoz, James S. Beaver, Feiko H. Ferwerda, Mark J. Bassett, Phil N. Miklas, Teresa Olczyk and Bill Bussey

University of Puerto Rico, Mayagüez (Dec. 2002). In Florida, Ferwerda (2001) evaluated BGYMV resistance in the interspecific cross G35172 × ICA Pijao. He reported that a recessive gene conferred resistance to leaf chlorosis and presented evidence of

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Kimberly Shearer and Thomas G. Ranney

interspecific crosses in cases in which parents varied substantially in genome size ( Fig. 2 ). Hybrids between species in the subgenera Syncarpea and Cynoxylon were readily apparent based on intermediate genome sizes including: C. capitata × C. florida

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Mark A. Mikel

, breeding lines, and genetic stocks are preserved at 5 locations in the U.S. ( Anonymous, 2004 ). These resources offer valuable germplasm for improvement of all types of lettuce. Use of interspecific crosses of L. sativa with other related lettuce species

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Sarah M. Smith and Zhanao Deng

pollination and population development Hand pollination was performed on these parental plants from June to Aug. 2007 to make interspecific crosses and produce interspecific F 1 seed ( Fig. 1 ). In the meantime, hand pollination was done to make intraspecific

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Timothy Rinehart, Sandra Reed and Brian Scheffler

Hydrangea popularity and use in the landscape has expanded rapidly in recent years with the addition of remontant varieties. Relatively little is known about the genetic background or combinability of these plants. We recently established microsatellite markers for hydrangea and evaluated their utility for estimating species diversity and identifying cultivars. We also verified an interspecific cross using these markers. Future research includes marker assisted breeding, particularly with respect to remontant flowering traits.

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Timothy F. Wenslaff and Paul M. Lyrene

Two diploid yellowleaf Vaccinium elliottii Chapmn. clones were pollinated with pollen from the tetraploid southern highbush cultivar `Misty' (largely V. corymbosum L). These interspecific crosses, which normally yield few hybrids because of a triploid block, were made with and without the use of V. elliottii mentor pollen mixed with V. corymbosum pollen. Mentoring had no effect on the number of hybrids produced when V. elliottii `Silverhill' was the seed parent, but when V. elliottii `Oleno' was the seed parent, no hybrids were produced unless mentor pollen was utilized. The difference was postulated to be a greater ability to produce one-seeded berries in `Silverhill' than in `Oleno'.

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Muhammet Tonguç and Phillip D. Griffiths

Black rot, caused by Xanthomonas campestris pv. campestris (Pam.) Dawson (Xcc), is a major bacterial disease of Brassica oleracea L. vegetables. In this study the related species Brassica carinata Braun (ethiopian mustard), which can be used to generate interspecific crosses with B. oleracea was evaluated for resistance to Xcc. Fifty-four accessions and susceptible control plants were wound inoculated with four isolates of Xcc race 4 at the juvenile stage. Of the 54 accessions tested, A 19182 and A 19183 exhibited no symptoms when inoculated with Xcc for all plants tested, and the accessions including PI 199947, PI 199949 and PI 194256 segregated for resistance to Xcc.

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J.D. Norton, G.E. Boyhan and B.R. Abrahams

Forty eight cultivars and seedlings of plum involving the species Prunus americana, P. auqustifolia, P. cerasifiera, P. munsoniana, P. salicina, P. simoni, and P. triflora were evaluated for the presence of xylem limiting bacteria (Xyllela fastidiosa) and tree longevity. Plum leaf scald (PLS) ratings, based on the percent of scalded leaves in the tree were correlated with the concentrations of bacteria in the twigs and leaf petioles. Observations of symptoms of PLS and monitoring of progeny from interspecific crosses, cultivars, and seedlings indicate that resistance to the PLS organism is present in the Auburn material and heritable. Uniform infection of seedlings was made by double budding of one year whips with buds from infected trees. Resistance to PLS has been incorporated into horticultural types and seedlings are currently being evaluated for possible release for commercial and home use.