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Evaluation of Brassica Carinata Accessions for Resistance to Black

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Evaluation of Brassica Carinata Accessions for Resistance to Black HORTSCIENCE 39(5):952–954. 2004. B. carinata accessions from the USDA col- lection for resistance to race 4 of Xcc using a Evaluation of Brassica carinata wound inoculation technique. Accessions for Resistance to Black Rot Materials and Methods Plant material. The USDA B. carinata (Xanthomonas campestris pv. campestris) collection (North Central Regional Plant In- troduction Station, Ames, Iowa) consists of 65 Muhammet Tonguç and Phillip D. Griffi ths1 accessions primarily from Ethiopia. Fifty-four Department of Horticultural Sciences, Cornell University N.Y. State Agricultural of these were available for evaluation. In total, Experiment Station, Geneva, NY 14456 36 seeds of each of the 54 accessions were sown in 32-cell (125-cm3) Styrofoam trays in Additional index words. ethiopian mustard, wound inoculation, Brassica oleracea ‘Cornell Mix’ (Boodley and Sheldrake, 1982) with one seed per cell (Speedling, Sun City, Abstract. Black rot, caused by Xanthomonas campestris pv. campestris (Pam.) Dawson Fla.) on 10 Apr. 2001. Cultivars of broccoli (Xcc), is a major bacterial disease of Brassica oleracea L. vegetables. In this study the (‘Marathon’, ‘Titleist’), caulifl ower (‘Snow related species Brassica carinata Braun (ethiopian mustard), which can be used to gener- Ball’, ‘Delira’), and cabbage (‘Atlantis’, ‘Bar- ate interspecifi c crosses with B. oleracea was evaluated for resistance to Xcc. Fifty-four tolo’) were planted as susceptible controls. accessions and susceptible control plants were wound inoculated with four isolates of Xcc Inoculation. The accessions were grown for race 4 at the juvenile stage. Of the 54 accessions tested, A 19182 and A 19183 exhibited no 3 weeks to the two-leaf stage in a greenhouse symptoms when inoculated with Xcc for all plants tested, and the accessions including PI at 23/20 oC day/night with a 14-h photope- 199947, PI 199949 and PI 194256 segregated for resistance to Xcc. riod under 1000 W metal halide lamps (300 μmol·m–2·s–1) in preparation for the inoculation. Black rot is a bacterial disease of Brassica Vicente et al. (2001) classifi ed Xcc into Four isolates of Xcc isolated from infected species caused by Xanthomonas campestris six distinct races. The most important of these cabbages in New York were obtained from D. pv. campestris (Xcc). The disease has a wide races are races 1 and 4, which account for over Reed (Reed’s Seeds, Cortland, N.Y.). These geographic distribution and is particularly de- 90% of black rot disease worldwide (Vicente et were screened with differential cultivars and structive to the Brassica vegetables (Williams, al., 2001). In addition, an association between characterized as race 4. These 4 Xcc isolates 1980). Xcc is a seedborne pathogen (Cook et occurrence of races 1 and 4 with B. oleracea were grown on YDCP medium (Shelton and al., 1952) that can overwinter on cruciferous crops or weedy Brassica species has been ob- Hunter, 1985) for 3 d and used to needle-in- weeds and wild relatives of cultivated Brassica served (Vicente et al., 2001). Evaluation of B. oculate the 54 accessions and control plants. crops (Schaad and Dianese, 1981). The princi- carinata material has indicated that resistance The wound inoculation involved piercing the pal methods for disease control are hot water is controlled by a single dominant gene that true leaf either side of the midrib with 2 Xcc treatment of seeds, good horticultural practices, controls resistance to races 1, 3 and 4 of black infected needles for each of the four isolates and use of copper bactericides. However, the rot (Guo et al., 1991; Vicente et al., 2001). (Shaw and Kado, 1988). Two inoculations disease continues to be problematic, particu- The major Brassica crop species are closely were undertaken, the fi rst when seedlings were larly during hot, humid seasons. Symptoms related forming the Brassica triangle (Prakash at the two- to three-true-leaf stage, and the of black rot may vary between host species, et al., 1999). These species have three genome second when the seedlings were at the four- to with most plants expressing V-shaped chlorotic types AA (B. rapa), BB (B. nigra) and CC (B. six-true-leaf stage. All plants were moved to regions originating from leaf margins following oleracea). The three genomes have naturally a 100% humidity chamber for 48 h following infection through the hydathodes. Under ideal combined and formed amphidiploid species B. the inoculation. conditions disease symptoms appear 10 to 14 juncea (AB), B. carinata (BC), and B. napus Plants were evaluated 10 to 14 d after the d after infection (Williams, 1980). (AC). When resistance to specifi c races was inoculation using a rating scale of 1 to 5 (1 = Earlier studies focused on black rot resistance evaluated, race 4 resistance appeared to be completely resistant, 5 = completely suscep- derived from B. oleracea, including the cabbage common in A genome Brassica species (B. tible) (Tonguç et al., 2003). Diseased leaves cultivar ‘Early Fuji’ (Bain, 1952), the inheri- rapa, B. juncea and B. napus). Resistance to were clipped carefully following the fi rst rating tance of which was reported to be controlled races 1, 3, and 4 was common in B genome and plants were allowed to develop new leaves by a single recessive gene with two modifi ers Brassica species (B. nigra, B. juncea and over a 2-week period for the second inocula- (Williams et al., 1972). Resistance has also been B. carinata) (Taylor et al., 2002). Brassica tion. Disease severity ratings were analyzed documented in B. oleracea plant introductions oleracea accessions have not been identifi ed for mean separations using Duncan’s multiple (PIs) including the cabbage accession PI 436606 that exhibit complete resistance to races 1 and range test (SAS, 1997). from China. The resistance from this source 4, but several accessions exhibit incomplete was reported to be controlled by a single reces- resistance to these races (Taylor et al., 2002), Results sive gene with one or two modifi ers (Dickson which has been attributed to the presence of and Hunter, 1987; Hunter et al., 1987). These quantitative trail loci (QTL) (Camargo et al., All control plants exhibited black rot sources have been used in the development of 1995). symptoms when wound inoculated. Broccoli black rot resistant germplasm, however; the To develop B. oleracea varieties with host controls exhibited slower symptom develop- resistance is typically incomplete and diffi cult plant resistance it will be necessary to identify ment than cabbage and caulifl ower controls. to incorporate into hybrid cultivars (Camargo and incorporate resistance genes that protect The mean disease severity rating of 54 B. et al., 1995). Other sources of resistance have the plants against races 1 and 4. It will also carinata accessions tested was 4.2 for rating been reported in B. nigra, B. juncea and other be necessary to use sources that have more 1 and 4.35 for rating 2 (Table 1). Only two Brassica species (Taylor et al., 2002; Westman manageable genetic control of resistance than accessions (A 19182 and A 19183) exhibited et al., 1999) including B. carinata accessions PI current B. oleracea-derived breeding lines. complete resistance in all plants tested for both 199947 and PI 199949 both formerly classifi ed Brassica carinata accessions provide an impor- ratings. All plants of seven accessions were as B. napus (Guo et al., 1991). tant germplasm resource for the development completely susceptible for rating 2, four of of hybrid Brassica vegetables because the these (PI 195923, PI 197402, PI 360883, and Received for publication 11 Feb. 2003. Accepted resistance has been documented as complete PI 209023) were also completely susceptible for publication 26 Aug. 2003 and single gene dominant when incorporated at rating 1. Fifteen accessions contained fi ve 1To whom reprint requests should be addressed; into cabbage and caulifl ower germplasm. The or more uninfected plants at rating 1. Rating e-mail [email protected]. purpose of this study was to evaluate available 2 identifi ed only fi ve accessions that had fi ve 952 HORTSCIENCE VOL. 39(5) AUGUST 2004 Table 1. Mean disease severity ratings of 54 Brassica carinata plant introductions (PIs) following inoculation of vegetable Brassicas such as, cabbage, with four isolates of Xcc race 4. caulifl ower, broccoli and brussel’s sprouts No. of Uninfected Uninfected (Bain, 1952; Hunter et al., 1987, Taylor et al., Accession plants with plants with plants with Rating 1 Rating 2 2002). No B. oleracea varieties with complete no. ratings 1 and 2 rating 1 rating 2 mean mean resistance to the most common races, 1 and 4, A 19182 30 30 30 1.0 o 1.0 oz have been developed. However, the cabbage A 19183 30 30 30 1.0 o 1.0 o breeding line Badger Inbred 16 (P.H. Williams, PI 280230 30 24 14 1.7 n 2.6 n Univ. of Wisconsin) has been documented as PI 193760 30 10 0 2.5 m 3.4 lm incompletely resistant to race 1 (Taylor et al., PI 194256 19 9 9 3.3 l 3.2 m 2002). The problems associated with B. olera- PI 194254 29 7 4 3.5 kl 3.6 l–k PI 199947 30 8 7 3.6 j–l 3.6 l–k cea derived sources highlight the need to use PI 199949 30 5 5 3.6 j–l 3.8 j–k resistance genes from outside the species. PI 360884 30 3 0 3.7 j–l 4.2 f–i Black rot resistance can be expressed at the PI 193460 30 7 1 3.8 h–k 4.1 g–j juvenile, mature, or both juvenile and mature PI 194251 30 6 1 3.8 h–k 4.4 a–h plant stages (Hunter et al., 1987).
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