Crossability of LA 1708 and interspecific hybrids as genetic bridge between L. peruvianum and L. esculentum

Previously Rick (1983) reported two L. peruvianum accessions (LA 1708 and LA 2172) which could be crossed with L. esculentum. Lindhout and Purimahua (1988) concluded that L. peruvianum accessions LA 1708 and LA 2172 are crossable with L. esculentum but not with other L. peruvianum accessions. Similar results were obtained, at "La Selva" Experiment Station, located at Rionegro (Antioquia, Colombia), with LA 1708 in the sense that is crossable with different L. esculentum varieties (cvs "Licato" and Alcobaca") as well as L. esculentum var. cerasiforme lines LA 2402 and LA 2394, when the former is used as male parent.

One self-incompatible adult plant was obtained from the cross LA 2394 x LA 1708. When LA 1708 was crossed with other L. peruvianum, no normal seeds were obtained, but when the hybrid was pollinated with the peruvianum accessions, normal, germinable, seeds were obtained. The above points out the possibility of using the interspecific hybrid as genetic bridge between esculentum and peruvianum. Also the backcross between LA 2394 x LA 1708 yielded seed when crossed with L. peruvianum as male parent. The obtained results are included in Table 1.

Table 1. Crossability of LA 1708 and interspecific hybrids between L. esculentum and L. peruvianum.

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       Parents           Number   % Fruit  Normal Germination
Female       Male      of Crosses   Set    Seeds    
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LA 2402    x LA 1708        10       70       1        +
cerasiforme  peruvianum
LA 1708    x LA 2402        12        0       -        -
peruvianum   cerasiforme
LA 2394    x LA 1708         5       80       3        +
cerasiforme  peruvianum
LA 1708    x LA 2394         9        0       -        -
peruvianum   cerasiforme
Licato     x LA 1708        20       70       1        +
esculentum   peruvianum
LA 1708    x Licato         12        0       -        -
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       Parents           Number   % Fruit  Normal Germination
Female       Male      of Crosses   Set    Seeds    
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peruvianum x esculentum 
"Alcobaca" x LA 1708           5      80      2        +
esculentum   peruvianum
LA 1708    x LA 98            13      67      0        -
peruvianum   peruvianum
(LA 2394  x LA 1708) x LA 98  12      58     22        +
Intersp.. hybrid peruvianum
LA 1708  x LA 103             20      65      0        -
peruvianum  peruvianum
(LA 2394  x LA 1708) x LA 103 10      70     46        +
Intersp.. hybrid peruvianum
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Lindhout, Pim, and Coen Purimahua. 1988. Use of L. peruvianum LA 1708 and LA 2172 as bridge between L. esculentum and L. peruvianum. TGC Report 38:29.

Rick, C. M. 1983. Crossability between L. esculentum and a new race of L. peruvianum. TGC. Report 33:13.