1PKDS77

Corn

Variety Description

Variety used for comparison: 'PH2T7V'

Summary: For the plants of ‘1PKDS77' anthesis occurs very late in the season whereas that for ‘PH2T7V' occurs late in the season. For the plants of ‘1PKDS77' silk emergence occurs very late in the season whereas for ‘PH2T7V' it occurs late in the season. Including the tassel, the plants of ‘1PKDS77' are shorter than those of ‘PH2T7V'. The ratio of the height of the insertion of the peduncle of the upper ear to the plant height for ‘1PKDS77' is medium whereas that of ‘PH2T7V' is small. The stem of ‘1PKDS77' has an absent or very slight degree of zig-zag whereas that of ‘PH2T7V' has a medium degree of zig-zag. The leaf blade of ‘1PKDS77' has an intermediate degree of undulation of the margin whereas that of ‘PH2T7V' has strong undulation of the margin. Excluding the base, the glume on the tassel of ‘1PKDS77' has a weak to medium intensity of anthocyanin colouration whereas that of ‘PH2T7V' has a strong intensity of anthocyanin colouration. The silks on the ear of ‘1PKDS77' have a medium intensity of anthocyanin colouration whereas those of ‘PH2T7V' have an absent or very weak intensity of anthocyanin colouration. The glumes on the cob of ‘1PKDS77' have a weak intensity of anthocyanin colouration whereas those of ‘PH2T7V' have a medium intensity of anthocyanin colouration.

Description:

PLANT: inbred yellow variety, medium ratio of height of insertion of peduncle of upper ear to plant height, anthesis occurs very late in season, silk emergence occurs very late 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, small angle with stem, slightly recurved

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

EAR: medium intensity of anthocyanin colouration of silks, medium length husk (extends one quarter length of ear above tip), conical shape, many rows of grain, weak intensity of anthocyanin colouration on glumes of cob
KERNEL: dent-like type, yellow on top, yellow on dorsal side

Origin & Breeding History: ‘1PKDS77' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. The variety resulted from a cross between two proprietary inbreds, conducted in Puerto Vallarta, Mexico in 2014. The F1 generation underwent haploidization, followed by chromosome doubling. Resulting DH1 lines were self pollinated and harvested in bulk for advancement and observations in Puerto Vallarta, Mexico; Arica, Chile; Janesville, Wisconsin, USA and Brookings, South Dakota, USA. ‘1PKDS77' was selected in 2017 in Brookings, South Dakota, USA, 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 F1DH in 2017.

Tests & Trials: The comparative trial for ‘1PKDS77' was conducted in Coteau-du-Lac, Quebec during the 2024 growing season. The trial was 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 of 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. Results were supported by the official technical examination report number 202400331, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison table for '1PKDS77' with reference variety 'PH2T7V'

Plant height (including tassel) (cm)

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Corn: '1PKDS77'

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Corn: Reference variety 'PH2T7V'

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Corn: '1PKDS77' (top) with reference variety 'PH2T7V' (bottom)