Genotype X Environment Interactions for Ovule Abortion in Interspecific Cotton Hybrids and Their Parent Cultivars

Richard G. Percy and Carl V. Feaster


 
ABSTRACT

High ovule abortion rates observed in G. hirsutum L. X G. barbadense L. interspecific F1 hybrids (ISH) have generally been attributed to the presence of genetic incompatibilities between the two parent species. Other causes of mote production within G. hirsutum and G. barbadense cottons are adverse environmental factors. This study was conducted to determine to what degree environment contributes to the large mote numbers observed in ISH, and to determine if parental combinations might influence hybrid sensitivity to mote production. Data were collected from four ISH and their four parent strains under normal and reduced irrigation regimes at two locations in 1983 and under normal and reduced irrigation regimes on three dates at one location in 1984. Measurements included potential seed number, ovule abortion rate, and locule weight. Significant generation X environment interactions were obtained for ovule abortion rates in 1983 and ovule abortion rates, potential seed number, and locule weight in 1984. ISH F1 populations' environmental responses were found to leviate significantly from the midparent response. Although the hybrid response was generally greater than that of either parent species', there appeared to be a preponderant influence of the G. barbadense parent upon the abortion response of the hybrid. No cultivar-within-species contribution to the interspecific hybrid's environmental response was observed. Little or no environmental response variation was observed among the ISH populations for the traits measured. Identification of environmental sensitivity within interspecific hybrids and its source should allow appropriate breeding efforts to be made to alleviate the problem.



Reprinted from 1986 Proceedings: Beltwide Cotton Production Research Conferences pg. 100
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998