PH4DFV

Corn

Variety Description

Variety used for comparison: 'PH25KM'

Summary: Anthesis for ‘PH4DFV' occurs mid season whereas that for ‘PH25KM' occurs late in the season. Silk emergence for ‘PH4DFV' occurs early in the season whereas that for ‘PH25KM' occurs late in the season. The brace roots of ‘PH4DFV' have a medium intensity of anthocyanin colouration whereas those of ‘PH25KM' have absent or very weak intensity of anthocyanin colouration. The ear of ‘PH4DFV' is longer and has a smaller diameter than that of ‘PH25KM'.

Description:

PLANT: inbred yellow variety, very small ratio of height of insertion of peduncle of upper ear to plant height, anthesis occurs mid season, silk emergence occurs early in season

STEM: absent or very slight degree of zig-zag, medium intensity of anthocyanin colouration on brace roots

LEAF BLADE (JUST ABOVE UPPER EAR): intermediate degree of undulation of margin, very small angle with stem, slightly recurved

TASSEL: absent or very few primary lateral branches, medium density of spikelets on middle third of main branch, long main axis above highest lateral branch
LATERAL BRANCHES: straight, very small angle with main axis
GLUME: absent or very weak intensity of anthocyanin colouration at base, absent or very weak intensity of anthocyanin colouration at apex and middle
ANTHER (ON MIDDLE THIRD OF MAIN BRANCH OF TASSEL): weak intensity of anthocyanin colouration

EAR: weak intensity of anthocyanin colouration of silks, conico-cylindrical shape, many rows of grain, weak intensity of anthocyanin colouration on glumes of cob
EAR WINGS: present on a low percentage of plants, medium length
KERNEL: dent type, yellow on top, yellow orange on dorsal side

TILLERING: absent

Origin & Breeding History: ‘PH4DFV' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. The variety resulted from a cross between two inbred lines, designated ‘PH25KM' and ‘PH1MD2', conducted in Puerto Vallarta, Mexico in 2010. The F1 generation underwent a haploidization process with subsequent chromosome doubling and selfing. Resulting DH1 lines were self pollinated and harvested in bulk. From 2010 to 2014, the DH2 to DH3 lines were self pollinated with subsequent ear selections, respectively. ‘PH4DFV' was selected in 2015 based on tassel size, pollen production, germination ability, stalk lodging resistance, late season plant health, yield in hybrid combination, grain quality, as well as disease and insect resistance. Breeder seed was established at the DH5 in 2015.

Tests & Trials: The comparative trials for 'PH4DFV' were conducted in Coteau-du-Lac, Quebec during the 2021 and 2022 growing seasons. The trials were planted in a RCB design with 3 replicates. Each replicate consisted of one 3 metre long row with 76 cm between the rows. With approximately 20 plants per row, there was a total 60 plants per variety. Measured characteristics were based on a minimum of 30 measurements per variety. Mean differences were significant at the 5% confidence probability level based on a paired Student's T-tests.

Comparison tables for 'PH4DFV' with reference variety 'PH25KM'

Ear length (cm)

Ear diameter (including kernels) (cm)

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Corn: 'PH4DFV' (top) with reference variety 'PH25KM' (bottom)