PH42SY

Corn

Variety Description

Variety used for comparison: 'PH1DB1'

Summary: The angle between the main axis and second lateral branch from the bottom of the tassel for 'PH42SY' is small while the angle is very small for 'PH1DB1'. Midway though anthesis, the silks on the ear of 'PH42SY' have a weak to medium 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 'PH42SY' have a strong intensity of anthocyanin colouration while those of 'PH1DB1' have a medium intensity of anthocyanin colouration. The main axis of the tassel above the highest lateral branch is medium in length for 'PH42SY' while it is long for 'PH1DB1'. Including the tassel, the plants of 'PH42SY' are shorter than the plants of 'PH1DB1'. The ear of 'PH42SY' is shorter, and including the kernels, has a larger diameter than that of 'PH1DB1'. The kernel of 'PH42SY' is dent-like type while the kernel of 'PH1DB1' is flint-like type. The primary ear of 'PH42SY' is located lower on the stem than that of 'PH1DB1'.

Description:

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

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

TASSEL: few 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, small angle with main axis, medium in length
GLUME: absent or very weak intensity of anthocyanin colouration throughout
ANTHER (ON MIDDLE THIRD OF MAIN BRANCH): absent or very weak to weak intensity of anthocyanin colouration

EAR: weak to medium intensity of anthocyanin colouration of silks, short to medium husk (level with to extending one quarter the length of the ear above tip), conico-cylindrical shape, medium to many rows of grain, medium to strong intensity of anthocyanin colouration on glumes of cob
EAR WINGS: present on a high percentage of plants, medium in length
KERNEL: dent-like type, yellow on top and dorsal side

TILLERING: present on a medium to high percentage of plants

Origin & Breeding History: 'PH42SY' 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 Moorehead, Minnesota, USA. The F1 generation was planted, self pollinated and harvested in bulk in 2008 in Buin, Chile and the haploidization process conducted on the resulting F2 progeny in 2009, in St. Polycarpe, Quebec, Canada. The haploids were doubled and self pollinated with subsequent ear selection in Buin. In 2009 and 2010, the D1 and D2 lines were self pollinated and harvested in bulk in St. Polycarpe, Quebec. In 2012, the D3 line was self pollinated with subsequent ear selection in St. Polycarpe, Quebec. In 2013, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Buin. 'PH42SY' 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 'PH42SY' 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 201900158, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH42SY' with reference variety 'PH1DB1'

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: 'PH42SY' (top) with reference variety 'PH1DB1' (bottom)