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Cucurbit Genetics Cooperative Report 11:37-38 (article 17) 1988

A Fasciated Mutant in Cucumis melo

D. Gabillard

Institut de Recherches Vilmorin, Ledenon, 30210 Remoulins, France.

M. Pitrat

Institut National del la Recherche Agronomique, BP 94, 84140 Montfavet, France.

As in Cucumis sativus (1) fasciated plants sometimes occur in C. melo. We have observed such a mutation in the line 'Vilmorin 104' in the 'Cantaloup Charentais' type. The plant grows normally for several nodes, then the main stem gets flat and wider and wider (up to 10-15 cm); no more lateral branches appear. The leaves remain small. The male and female flowers are fertile. This character can be seen easily on the main stem but it can also appear on lateral branches when the main stem has been previously cut. Fasciation seems to ne related with opposite leaf arrangement on the upper nodes. No influence of environmental factor has been detected.

The study of F1 and F2 progenies shows that fasciation is controlled by a recessive gene (Table 1). We propose the name "fasciated" and the symbol "fas" for this mutant.

First attempts to localize this mutant have been conducted with a line monoecious (a+), male sterile (ms-4), with dark green color of the fruit skin (w+) and an unknown gene for powdery mildew resistance (Pm). Fasciated segregates independently from these four genes.

Table 1. Observed phenotypes in F1 and F2 progenies between 'Vilmorin 104' (fasciated) and 'Bulgarie 7' (normal).

 
Normal
Fasciated
Chi square (3:1)
value
Probability
Vilmorin 104
0
20
Bulgarie 7
20
0
F1 = Bulgarie 7 x Vilmorin
25
0
F2 = F1 (x)
136
37
1.204
27.2

Table 2. Segregation data observed in F2 progenies between fasciated (fas) mutant and a, Pm, ms-4 and w.

Genes

normal

fas/+

fasciatedfas/fas

chi square (9:3 : 3:1)
 
value
probability
a+/-
96
31
2.388
49.6
a/a
38
7
Pm/-
100
29
0.945
81.5
Pm+/Pm+
35
9
ms-4+/-
102
26
1.582
66.4
ms-4/ms-4
34
11
w+/-
87
23
3.879
27.5
w/w
35
6

Literature Cited

  1. Robinson, R.W., 1978. Fsaciation in the cucumber. Cucurbit Gen. Coop Rept., 1, 11.
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Page citation: Wehner, T.C., Cucurbit Genetics Cooperative;
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