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Registration of maize germplasm line Mp717.

Maize (Zea mays L.) germplasm line Mp717 (Reg. no. GP-456, PI 639919) was released by USDA-ARS and the Mississippi Agricultural and Forestry Experiment Station in July 2005 as a source of resistance to Aspergillus flavus Link:Fr. infection and aflatoxin contamination.

Mp717 was derived through pedigree selection from an [F.sub.2] population developed by self pollinating in the cross of Mp420 (Scott and Zummo, 1992) and Tx601. [S.sub.1] progenies of the (Mp420 x Tx601) [F.sub.2] population were screened in the breeding nursery for plant type, seed production, and resistance to lodging. Selection for resistance to aflatoxin contamination was initiated in the [S.sub.2] generation, and inbreeding and selection for resistance to aflatoxin contamination were continued through the [S.sub.8] generation. Resistance to aflatoxin contamination was determined in replicated field trials conducted at Mississippi State, MS, by inoculating ears with an A. flavus spore suspension 7 to 14 d after silk emergence. Aflatoxin contamination was determined in mature ears using the VICAM Afla Test (VICAM, Watertown, MA) (Windham and Williams, 2002).

Mp717, whose pedigree is (Mp420 x Tx601)-16-1-1-3-1-1-1-1-B, was evaluated under the temporary designation Mp92:673 for resistance to aflatoxin contamination in a series of replicated field experiments conducted from 2000 to 2004 at Mississippi State, MS. Ears were inoculated with A. flavus, and aflatoxin contamination was determined in the grain of mature ears (Windham and Williams, 2002). Mp717 exhibited significantly greater resistance than its parent, Mp420, and levels of resistance similar to Mp313E (Scott and Zummo, 1990) and Mp715 (Williams and Windham, 2001). Mean levels of aflatoxin contamination for the resistant germplasm lines Mp313E, Mp420, Mp715, and Mp717 were 145, 875, 280, and 189 ng [g.sup.-1], respectively. Mean levels of contamination for susceptible lines GA209, Mp339, and SC212M were 4002, 2005, and 5580 ng [g.sup.-1], respectively. In a diallel cross, Mp717 exhibited significant general combining ability for reduced aflatoxin contamination (Williams et al., 2003). Mp717 has not been evaluated for combining ability for yield. Mp717 flowers approximately 7 d earlier than Mp313E and 14 d earlier than Mp715. Mp717 has yellow kernels, white cobs, and good husk coverage. Plants are approximately 1.3 m tall.

Seeds are available in 50-kernel lots to research personnel on written request to the corresponding author. It is requested that appropriate recognition of the source be given when this line contributes to research or germplasm enhancement.

References

Scott, G.E., and N. Zummo. 1990. Registration of Mp313E parental line of maize. Crop Sci. 30:1378.

Scott, G.E., and N. Zummo. 1992. Registration of Mp420 germplasm line of maize. Crop Sci. 32:1296.

Williams, W.P., and G.L. Windham. 2001. Registration of maize germplasm line Mp715. Crop Sci. 41:1374-1375.

Williams, W.P., G.L. Windham, and P.M. Buckley. 2003. Aflatoxin accumulation in maize after inoculation with Aspergillus fiavus and infestation with southwestern corn borer. J. Genet. Breed. 57:365-370.

Windham, G.L., and W.P. Williams. 2002. Evaluation of corn inbreds and advanced breeding lines for resistance to aflatoxin contamination in the field. Plant Dis. 86:232-234.

W.P. WILLIAMS * AND G.L. WINDHAM

USDA-ARS, Corn Host Plant Resistance Research Unit, Box 9555, Mississippi State, MS 39762. Joint contribution of USDA-ARS and the Mississippi Agricultural and Forestry Experiment Station. Miss. Agric. and Forestry Exp. Stn. Journal No. J-10802. Registration by CSSA. Received 26 Sept. 2005. * Corresponding author (wpwilliams@msamsstate.ars.usda.gov).

doi:10.2135/cropsci2005.09-0330

Published in Crop Sci. 46:1407-1408 (2006).
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Title Annotation:REGISTRATIONS OF GERMPLASMS
Author:Williams, W.P.; Windham, G.L.
Publication:Crop Science
Geographic Code:1USA
Date:May 1, 2006
Words:584
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