PH42SH

Corn

Variety Description

Variety used for comparison: 'PH1MBC'

Summary: Silk emergence for the plants of 'PH42SH' occurs early in the season whereas that for 'PH1MBC' ioccurs mid season. Including the tassel, the plants of 'PH42SH' are shorter than those of 'PH1MBC'. The anthocyanin colouration on the brace roots of 'PH42SH' is of a medium intensity whereas the intensity is strong on the brace roots of 'PH1MBC'. The ratio of height of insertion of the peduncle of the upper ear to the plant height for 'PH42SH' is large whereas that for 'PH1MBC' is medium. The angle between the leaf blade and the stem for 'PH42SH' is very small whereas that for 'PH1MBC' is small. The tassel of 'PH42SH' has a medium number of primary lateral branches whereas that of 'PH1MBC' has few primary lateral branches. The angle between the main axis and the lateral branches of the tassel for 'PH42SH' is very small whereas that for 'PH1MBC' is small. The main axis above the lowest lateral branch on the tassel of 'PH42SH' is a medium length whereas that for 'PH1MBC' is long. The lateral branches for 'PH42SH' are short whereas those of 'PH1MBC' are of a medium length. The glumes of the cob of 'PH42SH' have strong intensity of anthocyanin colouration whereas those of 'PH1MBC' have a medium intensity of anthocyanin colouration.

Description:

PLANT: inbred yellow variety, large 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): medium degree of undulation of margin, very small angle with stem, slightly recurved

TASSEL: medium number of primary lateral branches, moderately dense spikelets on middle third of main branch, medium length main axes above lowest lateral and highest lateral branches
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): absent or very weak intensity of anthocyanin colouration

EAR: weak intensity of anthocyanin colouration of silks, medium length husk (extends one quarter length of ear above 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, medium length
KERNEL: dent type, yellow on top, yellow orange on dorsal side

TILLERING: present on a low percentage of plants

Origin & Breeding History: 'PH42SH' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2010, a cross was conducted between proprietary inbred lines in Willmar, Minnesota USA. In 2011, the F1 generation underwent a haploidization process with subsequent chromosome doubling and selfing. Selected D1 lines were self pollinated and harvested in bulk. In 2013, the D2 and D3 lines were self pollinated with subsequent ear selections, respectively. 'PH42SH' 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 Puerto Vallarta, Mexico in 2014.

Tests & Trials: The comparative trial for 'PH42SH' 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 202000318, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison table for 'PH42SH' with reference variety 'PH1MBC'

Plant height (metres)

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Corn: 'PH42SH' (left) with reference variety 'PH1MBC' (right)

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Corn: 'PH42SH' (top) with reference variety 'PH1MBC' (bottom)