Abstract
Haploids were extracted from 66 differentSolanum tuberosum Group Andigena introductions usingS. tuberosum Group Phureja clone 1.22 as pollinator. The overall frequency of haploids was 13 per 100 fruit, with a high of 106. The overall average number of seeds per fruit was 1.4. Some Group Andigena clones produced primarily haploid, others primarily triploid, and still others primarily tetraploid progeny. The “triploid block” is still evident in these materials even though some clones produce primarily triploid progeny. It is suggested that the ploidy level of progeny produced in 4x - 2x crosses may be under relatively simple genetic control.
Resumen
Utilizando como polinizador el clon 1.22 deS. tuberosum Grupo Phureja, se extrajeron haploides de 66 introducciones diferentes deS. tuberosum Grupo Andigena. La frecuencia general de haploides fué de 13 por 100 frutos con un máximo de 106. El promedio general de semillas por fruto fué de 1.4. Algunos clones del Grupo Andigena produjeron mayormente haploides, mientras que otros, principalmente triploides y aún algunos otros, produjeron predominantemente progenies tetraploides. El “triploid block” es todavía evidente en estos materiales aún cuando algunos clones produjeron principalmente progenies triploides. Los resultados sugieren que el nivel de ploidia de los progenies resultantes de cruces 4x - 2x puede tener un control genético relativamente simple.
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Cooperative investigation of the Agricultural Research Service, U.S. Department of Agriculture and the Wisconsin Agricultural Experiment Station.