PH25VV

Corn

Variety Description

Variety used for comparison: 'PH0AV'

Summary: The tassel of 'PH25VV' has few primary lateral branches while the tassel of 'PH0AV' has a medium number of primary lateral branches. From the beginning of anthesis to just before milk development, the brace roots of 'PH25VV' have a medium to strong intensity of anthocyanin colouration while those of 'PH0AV' have an absent or very weak intensity of anthocyanin colouration. The main axis of the tassel above the highest lateral branch is medium in length for 'PH25VV' while it is very short to short for 'PH0AV'. Including the tassel, the plants of 'PH25VV' are taller than the plants of 'PH0AV'. The leaf blade just above the upper ear of 'PH25VV' is wider than that of 'PH0AV'. The ears of 'PH25VV' are longer, and including the kernels, have a larger diameter than those of 'PH0AV'.

Description:

PLANT: inbred yellow variety, small to medium ratio for height of insertion of peduncle of upper ear to plant height, anthesis and silk emergence occur mid-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): strong degree of undulation of margin, small angle with stem, straight

TASSEL: few primary lateral branches, medium density of spikelets on middle third of main branch, main axis above lowest lateral branch medium to long, main axis above highest lateral branch medium in length
LATERAL BRANCHES (SECOND BRANCH FROM BOTTOM OF TASSEL): straight, small angle with main axis, short to medium in length
GLUME: absent or very weak intensity of anthocyanin colouration at base, absent or very weak to weak intensity of anthocyanin colouration at middle and apex
ANTHER (ON MIDDLE THIRD OF MAIN BRANCH): strong to very strong 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 ear above tip), cylindrical shape, few to medium number of rows of grain, very strong intensity of anthocyanin colouration on glumes of cob
EAR WINGS: absent
KERNEL: dent type, yellow on top and dorsal side

TILLERING: absent

Origin & Breeding History: 'PH25VV' 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 Eau Claire, Wisconsin, USA. In 2007, the F1 underwent a haploidization process in Kekaha, Kauai, Hawaii, USA with the resulting haploid doubled and self pollinated with subsequent ear selection in Arica, Chile. In 2008, the D1 line was planted, self pollinated and harvested in bulk in Willmar, Minnesota. From 2010 to 2012, the D2 to D6 lines were self-pollinated with subsequent ear selection. In 2013, the D7 line was self pollinated and the D8 seed bulked as breeder seed in Willmar, Minnesota. 'PH25VV' 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 'PH25VV' 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 26 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 201700287, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH25VV' with reference variety 'PH0AV'

Plant height (including tassel) (metres)

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

Ear length (cm)

Ear diameter (in middle including kernels) (cm)

Click on image for larger view

Corn: 'PH25VV' (top) with reference variety 'PH0AV' (bottom)