PH1D9K

Corn

Variety Description

Variety used for comparison: 'PHEJW'

Summary: Primary lateral branches are absent on the tassel of 'PH1D9K' while there are few primary lateral branches on the tassel of 'PHEJW'. Midway through anthesis, the silks of 'PH1D9K' have a medium to strong intensity of anthocyanin colouration whereas those of 'PHEJW' have an absent or very weak intensity of anthocyanin colouration. Including the tassel, the plants of 'PH1D9K' are taller than the plants of 'PHEJW'. The ears of 'PH1D9K' are longer, and including the kernels, have a larger diameter than those of 'PHEJW'. The kernel of 'PH1D9K' is dent-like type while it is flint-like type for 'PHEJW'.

Description:

PLANT: inbred yellow variety, small ratio for height of upper ear peduncle insertion to plant height, anthesis and silk emergence occur late to very late in the season
STEM: absent or very slight degree of zig-zag, strong to very strong intensity of anthocyanin colouration on brace roots

LEAF BLADE (JUST ABOVE UPPER EAR): intermediate undulation of margin, very small to small angle with stem, straight

TASSEL: primary lateral branches absent, moderately sparse to medium density of spikelets on middle third of main branch
GLUME: absent or very weak intensity of anthocyanin colouration throughout
ANTHER (ON MIDDLE THIRD OF MAIN BRANCH): absent or very weak to weak intensity of anthocyanin colouration

EAR: medium to strong intensity of anthocyanin colouration of silks, short husk (level with tip), conico-cylindrical shape, few to a medium number of rows of grain, absent or very weak intensity of anthocyanin colouration on glumes of cob
EAR WINGS: present on a low to medium percentage of plants, short
KERNEL: dent-like type, yellow on top and dorsal side

TILLERING: absent

Origin & Breeding History: 'PH1D9K' was developed by Pioneer Hi-Bred International, Inc. using the pedigree method of plant breeding. The initial cross was conducted between proprietary inbred lines in 2004, in Miami, Missouri, USA. The F1 generation was planted, self pollinated and the F2 seed bulked in Salinas, Puerto Rico. In 2005, the F2 seed was planted and self pollinated with subsequent F3 ear selection in LaSalle, Colorado, USA. From 2006 to 2009, the F3 to F7 seed was planted ear to row and self pollinated with subsequent ear selection. In 2009, the F8 seed was planted ear to row, self pollinated and the F9 seed bulked as breeder seed in Algoma, Iowa, USA. 'PH1D9K' was selected 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.

Tests & Trials: The comparative trial for 'PH1D9K' was conducted in Coteau-du-lac, Quebec during the 2019 growing season. The trial was planted in a RCB Design with 3 replicates. Each replicate consisted of one row of approximately 20 plants, 3 metres in length with 76 cm between the rows. There was a total of 50 to 60 plants per variety. Measured characteristics were based on 30 measurements per variety. 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 201200314, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH1D9K' with reference variety 'PHEJW'

Plant height (including tassel) (metres)

Ear length (cm)

Ear diameter (in middle including kernels) (cm)

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Corn: 'PH1D9K' (top) with reference variety 'PHEJW' (bottom)