PH2DNP

Corn

Variety Description

Variety used for comparison: 'PH17RD'

Summary: Midway through anthesis, the silks on the ear of 'PH2DNP' have a weak to medium intensity of anthocyanin colouration while those of 'PH17RD' have a very weak to weak intensity of anthocyanin colouration. Including the tassel, the plants of 'PH2DNP' are taller than the plants of 'PH17RD'. The leaf blade just above the upper ear of 'PH2DNP' is wider than that of 'PH17RD'. The ear of 'PH2DNP' is shorter than the ear of 'PH17RD'. The ear of 'PH2DNP' has medium to many rows of dent-like type grain while the ear of 'PH17RD'has a few rows of flint-like type grain. The primary ear of 'PH2DNP' is located higher on the stem than that of 'PH17RD'.

Description:

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

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

TASSEL: absent or very few primary lateral branches, 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): weak intensity of anthocyanin colouration

EAR: weak to medium intensity of anthocyanin colouration of silks, long husk (extends one third the length of the ear above tip), conico-cylindrical shape, medium to many rows of grain, absent or very weak intensity of anthocyanin colouration on glumes of cob
EAR WINGS: present on a low percentage of plants
KERNEL: dent-like type, yellow on top and dorsal side

TILLERING: absent

Origin & Breeding History: 'PH2DNP' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2007, the initial cross was conducted between proprietary inbred lines in Puerto Vallarta, Mexico. The F1 generation was planted, self pollinated and harvested in bulk in 2007 in York, Nebraska and the haploidization process conducted on the resulting F2 progeny in 2008 in Oahu, Hawaii, USA. The haploids were doubled and self pollinated with subsequent ear selection. In 2008, the D1 line was self pollinated and harvested in bulk in Puerto Vallarta. In 2009, the D2 line was self pollinated with subsequent ear selection in York, Nebraska. In 2010, the D3 line was self pollinated and the D4 seed bulked as breeder seed in Puerto Vallarta, Mexico. 'PH2DNP' was selected based on yield in hybrid combination, tassel size, pollen production, germination ability, stalk lodging resistance, late season plant health, grain quality, as well as disease and insect resistance.

Tests & Trials: The comparative trial for 'PH2DNP' 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 a minimum of 29 measurements per variety. Mean differences were significant at the 5% probability level based on Student's T-tests. Results were supported by the official technical examination report 201700139, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH2DNP' with reference variety 'PH17RD'

Plant height (including tassel) (metres)

Leaf blade width (leaf just above upper ear) (cm)

Ear length (cm)

Primary ear, height from ground (metres)

Click on image for larger view

Corn: 'PH2DNP' (top) with reference variety 'PH17RD' (bottom)