Revised List of Monogenic Stocks

Chetelat, R. T.

C.M. Rick Tomato Genetics Resource Center Dept. of Plant Sciences Univ. of California, Davis, CA 95616

The following catalogue of 1,017 monogenic stocks (at 622 loci) is a revision of the previous list issued in TGC 52. (Lists of available wild species and miscellaneous genetic stocks were last updated in TGC 53 and TGC 54, respectively.) Certain obsolete or unavailable items have been deleted, newly acquired stocks have been added, inaccuracies corrected, and gene symbols revised to reflect allele tests or other information. This stock list includes only accessions we consider to be the primary sources for individual mutations: usually the original stock in which the mutation was first described, as well as any nearly isogenic lines into which it has been bred. Most mutant stocks are homozygous and true-breeding. However, seed of the male-steriles, homozygous-inviable mutants, and other stocks that are difficult or impossible to maintain as homozygotes, must be propagated via heterozygotes. In these cases, seed are provided in the form of segregating F2 or BC populations.

Monogenic mutants acquired since the last edition of this stock list are: bks¹ and bks² , seed testa mutants isolated by Bruce Downie; breeding lines containing Ph-3, a gene for resistance to Phytophthora infestans, bred into L. esculentum from L. pimpinellifolium by Peter Hanson; an indeterminate (sp⁺) isoline of M-82 donated by Dani Zamir; a stock of Rg-1 for high efficiency regeneration from tissue culture, bred into L. esculentum from L. peruvianum by Maarten Koorneef; allozyme variants for the markers Dia-2, Dia-3, Dia-4, Fdh-1, and Mae-1 transferred from S. lycopersicoides; stocks of the leaf vein mutant obv and its wild type (clear vein) allele.

Documented cases of allelism between mutants are incorporated into this list, and gene symbols revised accordingly. The mutant dg (dark green) was reported by Levin et al. (TAG 2003, 106: 454-460) to be an allele of hp-2 (high pigment-2), and is herein designated hp-2^dg.

Additional information on individual stocks, including phenotypes, references, images, chromosomal locations, etc., can be obtained through our website (http://tgrc.ucdavis.edu). We ask that users report any problems they detect in our lines, such as aberrant segregation, incorrect phenotypes, unexpected variability, etc. TGC members are also encouraged to submit stocks of verified monogenic mutants not listed here to the TGRC for maintenance and distribution.

Table 1. List of monogenic stocks, sorted by gene symbol. For each locus, stocks containing the original mutant allele are listed first, followed by any additional alleles at the same locus (‘prov’ indicates a provisional allele). Older gene symbols (synonyms) for each allele are listed (‘^’ indicates superscript). Each mutant is assigned to one or more phenotypic categories (Class), defined in Table 2 (‘*’ indicates the primary category for each allele). Background genotypes (Back.) of each stock are listed in abbreviated form, with full names given in Table 3. The origin of each mutation is specified as either spontaneous (‘SPON’), or induced by chemical treatment (‘CHEM’) or irradiation (‘RAD’). Isogenicity (Iso.) indicates whether the nonmutant control is available as an isogenic (‘IL’) or nearly isogenic (‘NIL’) line, or is nonisogenic (‘NON’).

Table 2. Definition of phenotypic class symbols listed in Table 1.

Class	Description
A	Anthocyanin modifications: intensification, reduction, elimination
B	Chlorophyll deficiency: white or whitish
C	Chlorophyll deficiency: yellow or yellowish
D	Chlorophyll deficiency: light, grey, or dull green
E	Chlorophyll deficiency: yellow-green
F	Virescent: chlorophyll deficiency localized at growing point
G	Variegation, flecking or striping
H	Leaf necrosis
I	Hair modifications: augmentation, reduction, distortion, elimination
J	Leaf form and size
K	Plant habit and size
L	Flower form and color
M	Inflorescence (exclusive of L)
N	Sterility: any condition leading to partial or complete unfruitfulness
O	Fruit form and surface texture
P	Fruit color and flavor, ripening modification
Q	Disease resistance
R	Root modification
S	Seed
T	Foliage color: dark
U	Foliage color, miscellaneous: olive, brown, blue-green
V	Allozyme variant
W	Overwilting stomatal defect
X	Vascular modification
Y	Nutritional or hormonal disorder
Z	Precocious development