PH25VF

Corn

Variety Description

Variety used for comparison: 'PH13A4'

Summary: The tassel of 'PH25VF' has a medium sized to large angle between the main axis and lateral branches whereas 'PH13A4' has a small to medium sized angle between the main axis and lateral branches. The lateral branches on the tassel of 'PH25VF' are slightly to moderately recurved whereas the lateral branches on the tassel of 'PH13A4' are straight. The plants of 'PH25VF' are taller than those of 'PH13A4'. 'PH25VF' has a long husk that extends one third the length of the ear above the tip whereas 'PH13A4' has a medium length husk that extends one quarter the length of the ear above the tip. When including the kernels, the diameter at the middle of the ear of 'PH25VF' is smaller than that of 'PH13A4'. The ear of 'PH25VF' has a cylindrical shape whereas the ear of 'PH13A4' has a conico-cylindrical shape.

Description:

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

TASSEL: anthesis occurs early to mid-season, medium sized to large angle between main axis and lateral branches during anthesis, moderately dense spikelets, short to medium length main axis above lowest lateral branch, medium to long main axis above highest lateral branch
LATERAL BRANCHES: few on main axis of tassel, slightly to moderately recurved
GLUME: absent or very weak intensity of anthocyanin colouration at base, weak to medium intensity of anthocyanin colouration at tip and on body
ANTHER: absent or very weak to weak intensity of anthocyanin colouration

EAR: early silk emergence, absent or very weak intensity of anthocyanin colouration of silks, long husk (extends one third length of ear above tip), 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: 'PH25VF' was developed by Pioneer Hi-Bred International, Inc. from the cross between proprietary inbred lines made in 2006 in Eau Claire, Wisconsin, USA using a double haploid plant breeding method. The F1generation underwent a haploidization process in Kekaha, Kauai, Hawaii, USA in 2007. The haploids were doubled, self-pollinated and ears were harvested near Buin, Chile in 2007. From 2008 to 2010, the subsequent D1 to D3 generations were self-pollinated and ears were 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 Willmar, Minnesota, USA and wide area testing was done in Canada and the USA from 2008 to 2010.

Tests & Trials: The comparative trial for 'PH25VF', 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 30 measurements. Mean differences were significant at the 5% probability level based on paired Student's T-tests. Results were supported by the official technical examination report 201700176, purchased from the Plant Variety Protection Office, Beltsville, Maryland, USA.

Comparison tables for 'PH25VF' with reference variety 'PH13A4'

Plant height (including tassel) (m)

Ear diameter (in middle including kernels) (cm)

Click on image for larger view

Corn: 'PH25VF' (top) with reference variety 'PH13A4' (bottom)