Cucurbit Genetics Cooperative Report 11:37-38 (article 17) 1988
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 |
normalfas/+ |
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
- Robinson, R.W., 1978. Fsaciation in the cucumber. Cucurbit Gen. Coop Rept., 1, 11.