Semigametic Production of Haploids in Pima Cotton1
- E. L. Turcotte and
- Carl V. Feaster2
Semigamy is a type of fertilization in which a sperm nucleus penetrates the egg cell but does not fuse with the egg nucleus. The egg and sperm nuclei divide independently, resulting in a heterogeneous embryo.
Haploids sectored for maternal and paternal tissue were obtained among F2 progenies of crosses of a semigametic line of Pima cotton (Gossypium barbadense L.), as female, with recessive multiple-marked stocks. Truebreeding lines of paternal origin were obtained by colchicine doubling of paternal sectors of certain chimeral haploids. Thus homozygous lines of selected parentage were produced.
Semigamy was controlled genetically and transmitted through both the egg and pollen but was functional only if the egg nucleus contained the factor or factors that condition it.
The development of a semigametic, marked stock widened the scope of material from which haploids can be produced effectively.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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