PH42RF

Corn

Variety Description

Variety used for comparison: 'PHEHG'

Summary: From the beginning of anthesis to just before milk development, the brace roots of 'PH42RF' have an absent or very weak intensity of anthocyanin colouration while those of 'PHEHG' have a medium intensity of anthocyanin colouration. The ears of 'PH42RF are longer, and including the kernels, have a smaller diameter than the ears of 'PHEHG'.

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

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

TILLERING: absent

Origin & Breeding History: 'PH42RF' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. In 2009, the initial cross was conducted between proprietary inbred lines in Woodstock, Ontario, Canada. In 2010, the F1 underwent a haploidization process in Oahu, Hawaii, USA. The haploids were doubled and self pollinated with subsequent ear selection. In 2010, the D1 line was self pollinated and harvested in bulk in Puerto Vallarta, Mexico. In 2013, the D2 and D3 lines were self pollinated with subsequent ear selection in Moorhead, Minnesota, USA and Buin, Chile, respectively. In 2014, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Moorhead, Minnesota. 'PH42RF' 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 'PH42RF' 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 201900156, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH42RF' with reference variety 'PHEHG'

Ear length (cm)

Ear diameter (in middle including kernels) (cm)

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Corn: 'PH42RF' (top) with reference variety 'PHEHG' (bottom)