PH2D58

Corn

Variety Description

Variety used for comparison: 'PH18G5'

Summary: Anthesis for the plants of 'PH2D58' occurs very late in the season whereas that for 'PH18G5' occurs late in the season. The leaf blade just above the upper ear of 'PH2D58' is wider than that of 'PH18G5'. The apex and middle of the glumes on the tassel of 'PH2D58' have absent or very weak intensity of anthocyanin colouration whereas those of 'PH18G5' have a medium intensity of anthocyanin colouration. In the middle third of the main branch of the tassel, the anthers of 'PH2D58' have strong intensity of anthocyanin colouration whereas those of 'PH18G5' have a medium intensity of anthocyanin colouration. The angle between the main axis and the lateral branches of the tassel for 'PH2D58' is small whereas that for 'PH18G5' is medium sized. The tassel of 'PH2D58' has absent or very few primary lateral branches whereas that of 'PH18G5' has few primary lateral branches. The main axes above the lowest and highest lateral branches of the tassel of 'PH2D58' is of a medium length whereas those of 'PH18G5' are very long.

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 late in season

STEM: absent or very slight degree of zig-zag, very strong intensity of anthocyanin colouration on brace roots

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

TASSEL: absent or very few primary lateral branches, medium density of spikelets on middle third of main branch, medium length main axes above lowest lateral and highest lateral branches
LATERAL BRANCHES: straight, small angle with main axis
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): strong intensity of anthocyanin colouration

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

TILLERING: none

Origin & Breeding History: 'PH2D58' 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 Salinas, Puerto Rico. The F1 generation underwent a haploidization process with subsequent chromosome doubling and selfing. In 2009, selected D1 lines were self pollinated and harvested in bulk. In 2011, the D2 and D3 lines were self pollinated with subsequent ear selections, respectively. 'PH2D58' 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 2011.

Tests & Trials: The comparative trial for 'PH2D58' 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 28 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 201800236, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison table for 'PH2D58' with reference variety 'PH18G5'

Leaf blade width (cm)

Click on image for larger view

Corn: 'PH2D58' (left) with reference variety 'PH18G5' (right)

Click on image for larger view

Corn: 'PH2D58' (top) with reference variety 'PH18G5' (bottom)