PH2TBY

Corn

Variety Description

Variety used for comparison: 'PH1DB1'

Summary: During anthesis, the angle between the main axis and the second lateral branch from the bottom of the tassel of 'PH2TBY' is of a medium degree while the angle is very small for 'PH1DB1'. Midway through anthesis, the silks on the ear of 'PH2TBY' have a very strong intensity of anthocyanin colouration while those of 'PH1DB1' have a strong intensity of anthocyanin colouration. From the beginning of anthesis to just before milk development, the brace roots of 'PH2TBY' have a very strong intensity of anthocyanin colouration while those of 'PH1DB1' have a medium intensity of anthocyanin colouration. The ear of 'PH2TBY' is shorter, and including the kernels, has a larger diameter than the ear of 'PH1DB1'. The kernel of 'PH2TBY' is yellow orange on the dorsal side while it is yellow for 'PH1DB1'.

Description:

PLANT: inbred yellow variety, medium ratio for height of insertion of peduncle of upper ear to plant height, anthesis occurs early to mid-season, silk emergence occurs early in the 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 degree of undulation of margin, small angle with stem, slightly recurved

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

EAR: very strong intensity of anthocyanin colouration of silks, medium length husk (extends one quarter the length of the ear above tip), conico-cylindrical shape, few to a medium number of rows of grain, strong intensity of anthocyanin colouration on glumes of cob
EAR WINGS: present on a very low percentage of plants
KERNEL: intermediate between flint-like type and dent-like type, yellow on top, yellow orange on dorsal side

TILLERING: present on a low to medium percentage of plants

Origin & Breeding History: 'PH2TBY' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2008, the initial cross was conducted between proprietary inbred lines in Moorhead, Minnesota, USA. In 2009, the F1 underwent a haploidization process in Arica, Chile. The haploids were doubled and self pollinated with subsequent ear selection in Buin, Chile. In 2010 and 2011, the D1 and D2 lines were self pollinated and harvested in bulk in Moorhead, Minnesota. In 2012, the D3 line was self pollinated with subsequent ear selection. In 2013, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Moorhead, Minnesota. 'PH2TBY' 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 'PH2TBY' 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 201900134, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH2TBY' with reference variety 'PH1DB1'

Ear length (cm)

Ear diameter (in middle including kernels)(cm)

Click on image for larger view

Corn: 'PH2TBY' (top) with reference variety 'PH1DB1' (bottom)