Registration of 'AP-4' Peanut

Tillman, B. L.; Gorbet, D. W.

'AP-4' (Reg. No. CV-106, PI 654070) peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) cultivar was developed by the University of Florida, Florida Agricultural Experiment Station, North Florida Research and Education Center (NFREC) near Marianna, FL. Tested under the experimental designation UF03325, AP-4 was approved for release in 2007. AP-4 was developed from a cross made in 1996 between a University of Florida breeding line (88 x OL3-HO6-) and the F(1) ('Andru 93' x F435-HO). Lines were advanced using single seed descent in the F(2) to F(4) generations and pedigree selection in the F(5) and F(6) generations. Seed from three F(7) plants were bulked to form the line later designated UF03325. AP-4 has larger-than-average runner-type seeds and pods. The average weight of 100 sound mature kernels of AP-4 was 71 g compared with 57 g for 'Georgia Green' (P < 0.0001), a typical runner-type cultivar. The prostrate growth habit of AP-4 is typical of runner-type peanut cultivars. Release of AP-4 was based on its pod yield and seed grade (total sound mature kernels [TSMK]). In 19 tests in Florida over 3 yr, the TSMK of AP-4 averaged 77% compared with 73% for AP-3' (P < 0.0001). AP-3 is most noted for its high level of resistance to spotted wilt caused by Tomato spotted wilt tospovirus, but low TSMK has restricted its acceptance among farmers. AP-4 has competitive pod yield potential and good resistance to spotted wilt. The improved TSMK of AP-4 should provide improved revenue compared to AP-3.