Valley Heart

Lettuce

Denomination: 'Valley Heart'
Previously Proposed Denomination: 'PS06511508'
Botanical Name: Lactuca sativa
Applicant/Holder: Seminis Vegetable Seeds, Inc.
800 North Lindbergh Blvd.
St. Louis, Missouri
63167
United States of America
Breeder: Alexandria Quesada, Seminis Vegetable Seeds, Inc., St. Louis, United States of America
Agent in Canada: Seminis Vegetable Seeds, Inc.
613 Tomahawk Cresent
Ancaster, Ontario
L9G 3T4
Canada
Tel: 905-304-1795
Application Date: 2004-12-17
Application Number: 05-4622
Grant of Rights Date: 2010-02-25
Certificate Number: 3807
Date rights revoked: 2012-07-09

Variety Description

Variety used for comparison: 'King Henry'

Summary: The seeds of 'Valley Heart' are white whereas they are black in 'King Henry'.

Description:

SEEDLING: absent or very weak anthocyanin colouration
COTYLEDONS: small to medium size, elliptic shape

PLANT: romaine type
OUTER LEAVES: green, medium intensity of colour
LEAF: medium thickness, elliptic shape, no anthocyanin colouration, medium glossiness, flat profile, entire
ATTITUDE: erect at 10-12 leaf stage, erect to semi-erect at harvest maturity
BLISTERING: weak to medium, small to medium size blisters
LEAF BLADE: entire, very weak undulation of margins, not flabellate (fan-shaped) venation
MARGINS INCISIONS AT APEX: shallow, sparse

SEED: white

Origin & Breeding History: 'Valley Heart' was derived from crossing 'Bautista' with 'Green Towers' in 1998 at the Seminis Vegetable Seed Research Station in Arroyo Grande, California, USA. Pedigree selection breeding method was used, using both single plant selection and mass selection practices. Selection criteria for 'Valley Heart' included uniformity and improved heading ability, adapted to the growing conditions of California and Arizona, and an increased ability to produce romaine hearts.

Tests & Trials: The tests and trials for 'Valley Heart' were conducted at Bank Gardens, Lynden, Ontario and Princeton, Ontario during the summers of 2007 and 2008. The trials consisted of a minimum of 105 plants, across a minimum of 3 replicates. Plants were spaced at 15 and 25 centimetre spacings, with a row spacing of 75 centimetres. Measured characteristics were based on 10 measurements.


Comparison tables for 'Valley Heart' with reference variety 'King Henry'

Plant diameter (cm)

  'Valley Heart' 'King Henry'
mean 30.4 29.6
std. deviation 1.6 3.8

Days to beginning of bolting under long day conditions

  'Valley Heart' 'King Henry'
number of days 52 52

Days to harvest maturity

  'Valley Heart' 'King Henry'
number of days 45 45

Click on image for larger view
Valley Heart
Lettuce: 'Valley Heart' (left) with reference variety 'King Henry' (right)

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