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ARS Home » Research » Publications at this Location » Publication #189825
Title: REACTION OF PEANUT CULTIVARS TO TOMATO SPOTTED WILT VIRUS (TSWV) UNDER FIELD CONDITIONS AND THEIR RESPONSE TO MECHANICAL INOCULATION BY TSWV UNDER GREENHOUSE CONDITIONS

Author
item AL-SALEH, M - GRADUATE STUDENT, OSU
item Melouk, Hassan
item MULDER, P - OSU, DEPT OF ENTOMOLOGY

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/17/2007
Publication Date: 6/1/2007
Citation: Al-Saleh, M.A., Melouk, H.A., Mulder, P. 2007. Reaction of peanut cultivars to Tomato spotted wilt virus (TSWV) under field conditions and their response to mechanical inoculation by TSWV under greenhouse conditions. Peanut Science. 34:44-52.

Interpretive Summary: Spotted wilt virus disease caused by Tomato spotted wilt virus (TSWV) has become a limiting factor in peanut production in the Southwest region of the United States. Eight peanut cultivars were evaluated for their reaction to TSWV in field plots in 2001, 2002, and 2003 at Pearsall, Texas, where the disease is endemic. Also, the response of these eight peanut cultivars to inoculation with TSWV under greenhouse conditions was determined. Comparison of the results obtained from the field with those from greenhouse evaluations suggest that the cultivars Georgia Hi Oleic, Georgia Green, Tamrun-96 and Tamrun OL 01 are useful as potential tools for management of TSWV in peanut for the Southwestern United States.

Technical Abstract: Spotted wilt virus disease caused by Tomato spotted wilt tospovirus (TSWV) has become a limiting factor in peanut (Arachis hypogaea L.) production in the Southwest region of the U.S. Selected peanut cultivars (Okrun, Southwest Runner, Tamrun 98, Tamrun 96, Georgia Green, Tamrun OL-02, Tamrun OL-01, and Georgia Hi Oleic) were evaluated for reaction to TSWV in field plots in 2001, 2002, and 2003. Field plots were located near Pearsall, Texas, where TSWV is endemic. In 2001 at 72 days post planting (DPP), incidence of TSWV was significantly (P <= 0.05) higher in Southwest runner, Okrun, and Tamrun 98 than the other cultivars except Tamrun OL02 in the test. In 2002, disease incidence of TSWV was low and thus only one reading was taken at 135 DPP where the cultivars Georgia Green and Georgia Hi Oleic exhibited the least incidence of spotted wilt. In 2003, at 58 DPP, Georgia Green, and Georgia Hi Oleic showed the lowest incidence of spotted wilt compared with other cultivars. The response of the eight peanut cultivars to TSWV following mechanical inoculation with TSWV at three plant ages was evaluated under greenhouse conditions. Disease severity index (DSI) and plant growth parameters such as root length, root volume, plant height, and fresh weight were determined. ELISA values (as indicative of the relative presence of TSWV), and relative water content were also determined to show the impact of TSWV infections in inoculated plants. Reductions in most plant growth parameters were observed when plants were inoculated with TSWV at five days post-planting, than twelve and nineteen days post-planting inoculation. Positive values of correlation coefficient (CC) between DSI and root volume or root length in the cultivars Georgia Hi Oleic, Georgia Green, Tamrun-96 and Tamrun OL 01 indicate resistance or tolerance to mechanical inoculation with TSWV. Negative values of CC between DSI and root length or root volume in the cultivars Tamrun-98, Tamrun OL-02, Southwest Runner, and Okrun provide evidence for their susceptibility to TSWV. Comparison of results obtained from the field with those from greenhouse evaluations suggest that Georgia Hi Oleic, Georgia Green, Tamrun-96 and Tamrun OL 01 cultivars are useful as potential tools for management of TSWV in peanut for the Southwestern United States.