PH42JS

Corn

Variety Description

Variety used for comparison: 'PH1DK3'

Summary: During anthesis, the angle between the main axis and the second lateral branch from the bottom of the tassel of 'PH42JS' is very small to small while the angle is small to medium for 'PH1DK3'. Midway through anthesis, the silks on the ear of 'PH42JS' have a weak intensity of anthocyanin colouration while those of 'PH1DK3' have a very strong intensity of anthocyanin colouration. The main axis of the tassel above the highest lateral branch is of medium length for 'PH42JS' while it is very short to short for 'PH1DK3'. Including the tassel, the plants of 'PH42JS' are taller than the plants of 'PH1DK3'. The leaf blade just above the upper ear of 'PH42JS' is wider than that of 'PH1DK3'. The ear of 'PH42JS' is shorter than that of 'PH1DK3'. The kernel of 'PH42JS' is yellow on the dorsal side while it is yellow orange for 'PH1DK3'. The glumes on the cob of 'PH42JS' have a medium intensity of anthocyanin colouration while that of 'PH1DK3' has a strong intensity of anthocyanin colouration.

Description:

PLANT: inbred yellow variety, very small ratio for height of insertion of peduncle of upper ear to plant height, anthesis occurs mid-season to late in the season, silk emergence occurs 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): absent or very weak undulation of margin, very small to small angle with stem, straight

TASSEL: few to a medium number of 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): slightly to moderately recurved, 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): weak to medium intensity of anthocyanin colouration

EAR: weak intensity of anthocyanin colouration of silks, short husk (level with tip), cylindrical shape, medium to many rows of grain, medium intensity of anthocyanin colouration on glumes of cob
EAR WINGS: absent
KERNEL: dent type, yellow on top and dorsal side

TILLERING: present on a low percentage of plants

Origin & Breeding History: 'PH42JS' 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 Puerto Vallarta, Mexico. In 2009, 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 Eau Claire, Wisconsin, USA. In 2011 and 2013, the D2 and D3 generations were self pollinated and harvested in bulk in Willmar Minnesota, USA. In 2013, the D4 line was self pollinated and the D5 seed bulked as breeder seed in Buin, Chile. 'PH42JS' 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 'PH42JS' 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 29 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 201900154, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for 'PH42JS' with reference variety 'PH1DK3'

Plant height (including tassel) (metres)

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

Ear length (cm)

Click on image for larger view

Corn: 'PH42JS' (top) with reference variety 'PH1DK3' (bottom)