PH25Y1

Corn

Variety Description

Variety used for comparison: 'PH1MBC'

Summary: During anthesis, the anthocyanin colouration at the base of the glume of 'PH25Y1' is of medium intensity whereas it is absent or very weak at the base of the glume of 'PH1MBC'. The intensity of anthocyanin colouration at the tip and glume body of 'PH25Y1' is strong to very strong whereas it is of medium intensity at the tip and glume body of 'PH1MBC'. The intensity of anthocyanin colouration of the silks of 'PH25Y1' is medium to strong whereas it is absent or very weak in 'PH1MBC'. At the end of anthesis, the main axis above the highest lateral branch is very short to short on the tassel of 'PH25Y1' whereas it is of medium length on the tassel of 'PH1MBC'. The plants of 'PH25Y1' are shorter than those of 'PH1MBC'. When including the kernels, the diameter at the middle of the ear of 'PH25Y1' is smaller than that of 'PH1MBC'. The ear of 'PH25Y1' has a conico-cylindrical shape whereas the ear of 'PH1MBC' has a cylindrical shape.

Description:

PLANT: inbred yellow corn variety, absent to low frequency of plants with ear wings

TASSEL: anthesis occurs early to mid-season, small angle between main axis and lateral branches during anthesis, medium to moderately dense spikelets, long to very long main axis above lowest lateral branch, very short to short main axis above highest lateral branch
LATERAL BRANCHES: medium number to many on main axis of tassel, slightly recurved
GLUMES: medium intensity of anthocyanin colouration at base, strong to very strong anthocyanin colouration at tip and on body
ANTHERS: absent or very weak intensity of anthocyanin colouration.

EAR: early to mid-season silk emergence, medium to strong intensity of anthocyanin colouration of silks, medium length husk (extends one quarter length of ear above tip), conico-cylindrical shape, very short ear wings, weak anthocyanin colouration of cob glumes
KERNEL: dent-like type, yellow on top and dorsal side

Origin & Breeding History: 'PH25Y1' was developed by Pioneer Hi-Bred International, Inc. from the cross between proprietary inbred lines made in 2006 in Kekaha, Kauai, Hawaii, USA using a pedigree plant breeding method. In 2007, the F1generation was planted, self-pollinated and harvested in bulk near Willmar, Minnesota, USA whereas the F2 population was self-pollinated and ears were selected in 2008. In 2009, F3 families were self-pollinated and ears were selected near Willmar, Minnesota. From 2010 to 2013, the subsequent F4 to F7 generations were also self-pollinated and ears selected in Willmar, Minnesota and Puerto Vallarta, Mexico until the F8 generation when the ears were bulked as breeder seed. Selection criteria included yield per se, yield in hybrid combination, tassel size, pollen production, stalk lodging resistance, late season plant health, grain quality, as well as disease and insect resistance. Yield trials were grown in Willmar, Minnesota, USA and wide area testing was done in Canada and the USA from 2008 to 2010.

Tests & Trials: The comparative trial for 'PH25Y1', conducted in Woodstock, Ontario during the 2017 growing season, was planted in a complete randomized design and consisted of 3 replicates. Plots consisted of one row 3 metres in length with a row spacing of 76 cm. Each plot had approximately 20 plants per replicate for a total of 50 to 60 plants per variety. Measured characteristics were based on a minimum of 29 measurements. Mean differences were significant at the 5% probability level based on unpaired Student's T-tests. Results were supported by the official technical examination report 201700177, purchased from the Plant Variety Protection Office, Beltsville, Maryland, USA.

Comparison tables for 'PH25Y1' with reference variety 'PH1MBC'

Plant height (including tassel) (m)

Ear diameter (in middle including kernels) (cm)

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Corn: 'PH25Y1' (top) with reference variety 'PH1MBC' (bottom)