Abstract
Nineteen haploids (2n = 2x = 24) extracted from four tetraploids ofSolanum tuberosum (2n = 4x = 48) with high 2n egg frequencies and known mode of 2n egg formation were evaluated via 4x progeny from 2x × 4x crosses (haploid × cultivar) for total tuber yield, tuber appearance and tuber set. Ninety-eight, 4x families (15-20 genotypes each) were planted in the randomized complete block design with two replications at two locations. Analyses of variance were conducted for all haploids over three common testers, and each of the four groups of haploids individually over a variable number of testers. The performance of haploids, based on general combining ability effects, was consistent for all traits, when tested with either three or more testers. Diploid clones can be evaluated in 2x × 4x crosses using three unrelated adapted 4x testers. Nonorthogonal comparisons indicated no significant differences for all traits among four groups of haploids, and between modes of 2n egg formation. Significant variation within each group of haploids indicates that selection at the haploid level should be carried out among haploids from either the same or different cultivars. Superior haploids can be utilized in 2x × 4x and 2x × 2x breeding schemes to generate 4x clones.
Compendio
Diecinueve haploides (2n = 2x = 24) extraidos de cuatro tetraploides deSolanum tuberosum (2n = 4x = 48) con alta frecuencia de huevos 2n y con un modo conocido de formación de los mismos, fueron evaluados vía una progenie 4x procedente de cruzamientos 2x × 4x (haploide × cultivar), para rendimiento en tubérculos, apariencia de tubérculo y formación de tubérculos. Noventa y ocho familias 4x (con 15–20 genotipos cada una) fueron plantadas en diseño de bloques completamente randomizados con dos repeticiones y en dos localidades. Se condujeron análisis de variancia para todos los haploides sobre tres probadores comunes e individualmente cada uno de los cuatro grupos de haploides sobre un número variable de probadores. El comportamiento de los haploides, basado en los efectos de su habilidad combinatoria general, fue consistente para todas sus características, cuando se les probó con tres o más probadores. Los clones diploides pueden ser evaluados en cruzamientos 2x × 4x utilizando tres probadores 4x adaptados no relacionados. Comparaciones no ortogonales no mostraron diferencias significativas para todas las características entre cuatro grupos de haploides, y entre los modos de formación de huevos 2n. La variación significativa dentro de cada grupo de haploides indica que la selección al nivel de haploide debe ser llevada a cabo entre los haploides ya sea para los mismos o diferentes cultivares. Haploides superiores pueden ser utilizados en programas de mejoramiento 2x × 4x y 2x × 2x, para generar clones 4x.
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Werner, J.E., Peloquin, S.J. Potato haploid performance in 2x × 4x crosses. American Potato Journal 68, 801–811 (1991). https://doi.org/10.1007/BF02853854
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DOI: https://doi.org/10.1007/BF02853854