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Denomination: 'NL30-RBK'
Previously Proposed Denomination: 'NL30-RBK-350'
Botanical Name: Solanum tuberosum
Applicant/Holder: Monsanto Company
700 Chesterfield Parkway North
Mail Zone BB4D
St. Louis, Missouri
United States of America
Breeder: Monsanto Company, St. Louis, United States of America
Agent in Canada: Osler, Hoskin & Harcourt LLP
Suite 1900
340 Albert Street
Ottawa, Ontario
K1R 7Y6
Tel: 613-235-7234
Application Date: 1997-10-10(priority claimed)
Application Number: 97-1170
Protective direction granted: 1997-10-10
Protective direction withdrawn: 2000-01-25
Grant of Rights Date: 2002-09-10
Certificate Number: 1235
Date rights revoked: 2014-09-10

Variety Description

Variety used for comparison: 'Russet Burbank'

Summary: 'NL30-RBK' produces a leaf type plant while 'Russet Burbank' produces a plant type intermediate between stem and leaf type. 'NL30-RBK' produces smaller tubers than 'Russet Burbank'. 'NL30-RBK' differs from 'Russet Burbank' in that it is resistant to Colorado Potato Beetle (Leptinotarsa decemlineata) provided through the presence of the cryIIIA protein produced in the plant cells due to presence of the gene obtained from Bacillus thuringeinsis subsp. tenebrionis. The variety also resists potato leafroll virus (PLRV) due to the presence of the gene encoding for the replicase of potato leafroll virus.


'NL30-RBK' is a late season maturing potato variety. 'NL30-RBK' has a spreading growth habit and produces a leaf type plant which is medium to tall in height. The stems are thin to medium in thickness and have weak to medium anthocyanin colouration. Stem wings are strongly prominent and waved single. The stem nodes have medium swelling and no anthocyanin. 'NL30-RBK' produces a moderate number of branches.

The leaves of 'NL30-RBK' are olive green in colour and are weak to moderately pubescent on the lower surface. The leaf silhouette is open. The leaf rachis has absent to very weak anthocyanin on the top and no anthocyanin on the bottom. The rachis has strong pubescence on the top and is glabrous on the bottom. The petioles have very weak to weak anthocyanin and the stipules are medium in size. The terminal leaflets are medium ovate in shape with acute shaped tips and obtuse to cordate shaped, symmetrical bases. The margins of the terminal leaflets are very weakly waved. 'NL30-RBK' has five pairs of primary leaflets which are small to medium in size. They are narrowly ovate in shape with acute shaped tips and cordate shaped, weakly asymmetrical bases.

'NL30-RBK' produces a low to medium number of inflorescences per plant and a medium number of florets per inflorescence. The flower buds have medium to strong anthocyanin and are moderately persistent. The flowers are white in colour when fully open with no anthocyanin on the inner and outer side of the corolla. The corolla is medium in size with a moderately prominent star. The calyx and peduncles have absent to weak anthocyanin. The anthers are lemon yellow in colour when the flower is fully expanded and are arranged in a pear shaped cone. The stigma is capitate and light green in colour.

The tubers of 'NL30-RBK' have buff coloured skin with no secondary colour. Skin texture is netted and tuber shape is long. Tuber eyes are deep, high in numbers and evenly distributed. The eyebrows are slight to medium in prominence. The tuber flesh is white in colour with no secondary colour. 'NL30-RBK' produces a medium number of tubers per plant.

The light sprout of 'NL30-RBK' is ovoid in shape with strong pubescence and medium, red-violet anthocyanin colouration at the base. The light sprout tip has a closed habit. The tip has strong pubescence and no anthocyanin. The light sprout has a medium frequency of root initials and weak protrusion of lenticels. The lateral shoots on the light sprout are short in length.

Origin & Breeding History: 'NL30-RBK' contains the cryIIIA gene from Bacillus thuringiensis subsp. tenebrionis which encodes the CPB active protein, the gene encoding for the replicase of potato leafroll virus and the nptII marker gene from the prokaryotic transposon Tn5 which codes for the enzyme neomycin phosphotransferase ll which confers resistance to kanamycin. These genes were stably transferred into the genome of 'Russet Burbank' potato plants using Agrobacterium tumefaciens mediated transformation utilizing binary double border plant expression vector, PV-STMT21.

Tests & Trials: Tests and trials for 'NL30-RBK' were conducted in North Tilley, New Brunswick in 1998. A randomized block design was used with four replicates per variety. All entries were planted in single-row plots which were 18 feet long. Spacing between adjacent plots was 36 inches. There was a total of 18 plants per plot. Measured characteristics were based on 20 measurements. The plots were not treated with insecticides.

Comparison tables for 'NL30-RBK' with reference variety 'Russet Burbank'

Tuber length (mm)

  'NL30-RBK' 'Russet Burbank'
mean 94.7 114.4
range 80-123 91-143
std. deviation 13.1 12.9

Tuber width (mm)

  'NL30-RBK' 'Russet Burbank'
mean 52.2 59.4
range 46-56 55-70
std. deviation 2.3 4.3

Tuber thickness (mm)

  'NL30-RBK' 'Russet Burbank'
mean 44.8 50.9
range 40-48 45-58
std. deviation 2.5 3.4
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