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Cucurbit Genetics Cooperative Report 22:14-15 (article 6) 1999

Description and Inheritance of an Albino Mutant in Melon

D. Besombes, N. Giovinazzo, C. Olivier, C. Dogimont, and M. Pitrat

INRA, Station de Genetique et d'Amelioration des Fruits et Legumes, BP 94, 84143 Montfavet Cedex (France)

A spontaneous albino mutant of Cucumis melo L. has been observed ion 'Trystrorp', an accession from Sweden. Cotyledons are white and plants died one to two weeks after germination. Germination of the seeds was very high in different generations indicating no lethal effect on the embryos. Because homozygous plants cannot be used as female or male parents, only heterozygous plants can be used for inheritance studies.

The F1 between 'Trystorp' and 'Vedrantais' was backcrossed three successive times to 'Vedrantais' (a normal charentais type line). These plants were selfed after each backcross (BCXS1) in order to verify if they were heterozygous for albino or normal. All the heterozygotes were normal indicating that albinism is completely recessive. Selfed backcrosses segregating for albinism fit a 1:1 ratio (Table 1) in the different generations. the number of progenies fit a 3:1 ratio in the BC1 and BC2 , but in the BC3 and BC4 there was an excess of albinos (Table 2). The segregation observed on the total number of plants in the different progenies fits a 3:1 ratio. Therefore, the albino trait can be explained by the action of one recessive gene. No other albino mutants has been described to our knowledge. We propose this mutant be named albino with the symbol alb.

Table 1. Number of plants whose selfed progeny segregated for albino in successive backcrosses of the F1('Trystorp' x Vedrantais') to 'Vedrantais'.

 
Number observed
X2
Segregating
Non-segregating
Ratio tested
Value
Probability
BC1
9
5
1 : 1
1.143
29%
BC2
8
12
1 : 1
0.800
37%
BC3
10
7
1 : 1
0.529
47%
BC4
7
12
1 : 1
1.316
25%
Total
17
19
1 : 1
0.111
74%

Table 2. Segregation for albino observed in selfed BC progenies.

Population
Number observed
X2
 
Normal
Mutant
Ratio tested
Value
Probability
BC1S1

95-2033

11
1
3 : 1
1.778
18%

95-2034

41
15
3 : 1
0.095
76%

95-2019

48
11
3 : 1
1.271
26%

95-2023

32
8
3 : 1
0.533
47%
Total BC1S1
132
35
3 : 1
1.455
23%
BC2S1

96-1008

47
14
3 : 1
0.137
71%

96-1010

30
11
3 : 1
0.073
79%

96-1012

14
4
3 : 1
0.074
79%

96-1020

25
6
3 : 1
0.527
47%
Total BC2S1
116
35
3 : 1
0.267
61%
BC3S1
97-1039
40
27
3 : 1
8.363
0.4%
97-1040
60
28
3 : 1
2.182
14%
Total BC3S1
100
55
3 : 1
9.086
0.3%
BC4S1

98-1060

41
19
3 : 1
1.422
23%

98-1062

65
31
3 : 1
2.722
10%
Total BC4S1
106
50
3 : 1
4.137
4%
Total
454
175
3 : 1
2.671
10%
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Page citation: Wehner, T.C., Cucurbit Genetics Cooperative;
Created by T.C. Wehner and T. Ng, 1 June 2005; design by C.T. Glenn;
send questions to T.C. Wehner; last revised on 23 October, 2009