1PTBJ78

Corn

Variety Description

Variety used for comparison: 'PH25VF'

Summary: Including the tassel, the plants of ‘1PTBJ78' are shorter than those of ‘PH25VF'. The brace roots of ‘1PTBJ78' have an absent or very weak intensity of anthocyanin colouration whereas those of ‘PH25VF' have a medium intensity of anthocyanin colouration. The leaf blade of ‘1PTBJ78' is wider than that of ‘PH25VF'. The angle between the main axis and lateral branches on the tassel of ‘1PTBJ78' is very small whereas that for ‘PH25VF' is medium sized. The ear of ‘1PTBJ78' is longer than that of ‘PH25VF'. The glumes of the cob of ‘1PTBJ78' have an absent or very weak intensity of anthocyanin colouration whereas those of ‘PH25VF' have a medium intensity of anthocyanin colouration.

Description:

PLANT: inbred yellow variety, small ratio of height of insertion of peduncle of upper ear to plant height, anthesis occurs mid-season, silk emergence occurs 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, small angle with stem, slightly recurved

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

EAR: weak intensity of anthocyanin colouration of silks, short husk (level with tip), conico-cylindrical shape, very many rows of grain, absent or very weak intensity of anthocyanin colouration on glumes of cob
EAR WINGS: absent
KERNEL: intermediate type, yellow on top, yellow on dorsal side

TILLERING: absent

Origin & Breeding History: ‘1PTBJ78' was developed by Pioneer Hi-Bred International, Inc. using a double haploid plant breeding method. The variety resulted from a cross between two inbred lines, designated ‘PH25VF' and ‘PH2FV2', conducted in Puerto Vallarta, Mexico in 2013. The F1 generation underwent haploidization, followed by chromosome doubling and selfing, as part of a field experiment conducted in Oahu, Hawaii,k USA, which was planted in October 2013. Resulting DH1 lines were self pollinated and harvested in bulk. ‘1PTBJ78' was selected 2016 based on tassel size, pollen production, germination ability, stalk lodging resistance, late season plant health, yield in hybrid combination, grain quality, as well as disease and insect resistance. Breeder seed was established at the DH2 in 2016.

Tests & Trials: The comparative trial for ‘1PTBJ78' was conducted in Coteau-du-Lac, Quebec during the 2023 growing season. The trial was planted in a RCB design with 3 replicates. Each replicate consisted of one 3 metre long row with 76 cm between the rows. With approximately 20 plants per row, there was a total of 60 plants per variety. Measured characteristics were based on a minimum of 30 measurements per variety. Mean differences were significant at the 5% confidence probability level based on a paired Student's T-tests. Results were supported by the official technical examination report number 202300228, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for '1PTBJ78' with reference variety 'PH25VF'

Plant height (including tassel) (metres)

Leaf width (cm)

Ear length (cm)

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Corn: '1PTBJ78'

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Corn: Reference variety 'PH25VF'

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Corn: '1PTBJ78' (top) with reference variety 'PH25VF' (bottom)