PH25KM

Corn

Variety Description

Variety used for comparison: 'PHF0D'

Summary: The plants of 'PH25KM' are taller than those of 'PHF0D'. 'PH25KM' has a shorter ear than that of 'PHF0D'. The kernel type is dent-like for 'PH25KM' whereas it is dent for 'PHF0D'.

Description:

PLANT: inbred yellow corn variety, no plants with ear wings

TASSEL: anthesis occurs late, moderately dense spikelets, short to medium length main axis above lowest lateral branch, long main axis above highest lateral branch
LATERAL BRANCHES: absent or very few primary lateral branches on main axis of tassel
GLUME: absent or very weak intensity of anthocyanin colouration at base, weak intensity of anthocyanin colouration at tip and on body
ANTHER: absent or very weak to weak intensity of anthocyanin colouration

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

Origin & Breeding History: 'PH25KM' was developed by Pioneer Hi-Bred International, Inc. from the cross between proprietary inbred lines made in 2006 in Salinas, Puerto Rico using a double haploid plant breeding method. In 2006, the F1 generation was planted, self-pollinated and harvested in bulk. The F2 generation underwent a haploidization process in Puerto Vallarta, Mexico in 2007. The haploids were doubled, self-pollinated and ears were harvested in 2008 near Buin, Chile. From 2008 to 2010, the subsequent D1 to D3 generations were self-pollinated and harvested in bulk. Selection criteria used in the advancement process 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 Janesville, Wisconsin, USA and wide area testing was done in Canada and the USA from 2008 to 2010.

Tests & Trials: The comparative trial for 'PH25KM', 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 23 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 201700173, purchased from the Plant Variety Protection Office, Beltsville, Maryland, USA.

Comparison tables for 'PH25KM' with reference variety 'PHF0D'

Plant height (including tassel) (m)

Ear length (cm)

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Corn: 'PH25KM' (top) with reference variety 'PHF0D' (bottom)