PH2TVM

Corn

Variety Description

Variety used for comparison: 'PHEWB'

Summary: For the plants of 'PH2TVM', anthesis and silk emergence occur mid-season to late in the season while for the plants of 'PHEWB' anthesis and silk emergence occur early to mid-season. The tassel of 'PH2TVM' has few to a medium number of primary lateral branches while the tassel of 'PHEWB' has medium to many primary lateral branches. Including the tassel, the plants of 'PH2TVM' are shorter than the plants of 'PHEWB'. The leaf blade just above the upper ear of 'PH2TVM' is narrower than that of 'PHEWB'. The ear of 'PH2TVM' is shorter, and including the kernels, has a smaller diameter than the ear of 'PHEWB'. The glumes on the cob of 'PH2TVM' have a strong to very strong intensity of anthocyanin colouration while the glumes on the cob of 'PHEWB' have a weak to medium intensity of anthocyanin colouration. The primary ear of 'PH2TVM' is located higher on the stem than that of 'PHEWB'.

Description:

PLANT: inbred yellow variety, large to very large 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, absent or very weak 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: few to a medium number of primary lateral branches, medium density of spikelets on middle third of main branch, main axis above lowest lateral branch long, main axis above highest lateral branch medium in length
LATERAL BRANCHES (SECOND BRANCH FROM BOTTOM OF TASSEL): straight, very small angle with main axis, medium to long
GLUME: absent or very weak intensity of anthocyanin colouration throughout
ANTHER (ON MIDDLE THIRD OF MAIN BRANCH): absent or very weak intensity of anthocyanin colouration

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

TILLERING: absent

Origin & Breeding History: 'PH2TVM' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2006, the initial cross was conducted between proprietary inbred lines in Kekuha, Kauai, Hawaii, USA. In 2007, the haploidization process was conducted on the F1 progeny in Mankato, Minnesota, USA. In 2008, the haploids were doubled and self pollinated with subsequent ear selection in Arica, Chile. In 2009, the D1 line was self pollinated and harvested in bulk in Eau Claire, Wisconsin, USA. In 2012, the D2 and D3 lines were self pollinated with subsequent ear selections in Eau Claire, Wisconsin and San Felipe, Chile, respectively. In 2013, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Eau Claire, Wisconsin. 'PH2TVM' 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 'PH2TVM' 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 201800280, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH2TVM' with reference variety 'PHEWB'

Plant height (including tassel) (metres)

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

Ear length (cm)

Ear diameter (in middle including kernels) (cm)

Primary ear, height from ground (metres)

Click on image for larger view

Corn: 'PH2TVM' (top) with reference variety 'PHEWB' (bottom)