PH2TV4

Corn

Variety Description

Variety used for comparison: 'PH12K9'

Summary: For the plants of 'PH2TV4', anthesis and silk emergence occur mid-season to late in the season while anthesis and silk emergence occur late to very late in the season for the plants of 'PH12K9'. Primary lateral branches are absent or very few on the tassel of 'PH2TV4' while the tassel of 'PH12K9' has a few primary lateral branches. From the beginning of anthesis to just before milk development, the brace roots of 'PH2TV4' have a medium to strong intensity of anthocyanin colouration while those of 'PH12K9' have a strong to very strong intensity of anthocyanin colouration. Including the tassel, the plants of 'PH2TV4' are shorter than the plants of 'PH12K9'. The leaf blade just above the upper ear of 'PH2TV4' is narrower than that of 'PH12K9'. The primary ear of 'PH2TV4' is located lower on the stem than that of 'PH12K9'.

Description:

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

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

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

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

TILLERING: absent

Origin & Breeding History: 'PH2TV4' 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 Marion, Iowa, USA. In 2009, the haploidization process was conducted on the F1 progeny in Oahu, Hawaii, USA. In 2009, the haploids were doubled and self pollinated with subsequent ear selection in Oahu, Hawaii. In 2010, the D1 line was self pollinated and harvested in bulk in Eau Claire, Wisconsin, USA. In 2012 and 2013, the D2 and D3 generations were self pollinated with subsequent ear selections in Eau Claire, Wisconsin and Arica, Chile, respectively. In 2014, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Eau Claire, Wisconsin. 'PH2TV4' 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 'PH2TV4' 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 201800279, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH2TV4' with reference variety 'PH12K9'

Plant height (including tassel) (metres)

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

Primary ear, height from ground (metres)

Click on image for larger view

Corn: 'PH2TV4' (top) with reference variety 'PH12K9' (bottom)