PH42YR

Corn

Variety Description

Variety used for comparison: 'PH1MD0'

Summary: Including the tassel, the plants of 'PH42YR' are taller than those of 'PH1MD0'. The leaf blade just above the upper ear of 'PH42YR' has absent or very weak undulation of the margin whereas that of 'PH1MD0' has a medium degree of undulation. The tassels of 'PH42YR' have few primary lateral branches whereas those of 'PH1MD0' have absent or very few primary lateral branches. The tassels of 'PH42YR' have moderately sparse spikelets whereas those of 'PH1MD0' have a medium density of spikelets. The main axis above the lowest lateral branch of the tassel of 'PH42YR' is of a medium length whereas that of 'PH1MD0' is short. The primary ear of 'PH42YR' is located higher on the stem than that of 'PH1MD0'. The ear of 'PH42YR' is longer than that of 'PH1MD0'. The husk covering the tip of the ear of 'PH42YR' is short whereas that of 'PH1MD0' is a medium length. The ear wings for 'PH42YR' are short and present on a medium percentage of plants whereas those for 'PH1MD0' are a medium length and present on a low percentage of plants.

Description:

PLANT: inbred yellow variety, medium 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, absent or very weak intensity of anthocyanin colouration on brace roots

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

TASSEL: few primary lateral branches, moderately sparse spikelets on middle third of main branch, short main axis above lowest lateral branch, medium length main axis above highest lateral branch
LATERAL BRANCHES: straight, very small angle with main axis, short
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): medium intensity of anthocyanin colouration

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

TILLERING: present on a low percentage of plants

Origin & Breeding History: 'PH42YR' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2008, a cross was conducted between proprietary inbred lines in Puerto Vallarta, Mexico. In 2009, the F1 generation underwent a haploidization process with subsequent chromosome doubling and selfing. In 2010, selected D1 lines were self pollinated and harvested in bulk. In 2012 and 2013, the D2 and D3 lines were self pollinated with subsequent ear selections, respectively. 'PH42YR' 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. The D5 seed was bulked as breeder seed in Eau Claire, Wisconsin, USA, in 2014.

Tests & Trials: The comparative trial for 'PH42YR' was conducted in Coteau-du-Lac, Quebec during the 2021 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 50 to 60 plants per variety. Measured characteristics were based on a minimum of 30 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 202000319, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH42YR' with reference variety 'PH1MD0'

Plant height (metres)

Primary ear height (metres)

Ear length (cm)

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Corn: 'PH42YR' (left) with reference variety 'PH1MD0' (right)

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Corn: 'PH42YR' (top) with reference variety 'PH1MD0' (bottom)