Maize tertiary trisomic stocks derived from B-A translocations.

Area of Science:

• Plant Genetics
• Chromosome Engineering
• Maize Biology

Background:

• Reciprocal translocations between B chromosomes and A chromosomes in maize offer tools for chromosomal segment dosage manipulation.
• B-A translocations are instrumental in generating aneuploid gametes.

Purpose of the Study:

• To develop and characterize tertiary trisomic stocks derived from B-A reciprocal translocations in maize.
• To compare the effects of maternally versus paternally transmitted B-A chromosomes.
• To analyze the transmission rates of B-A chromosomes in tertiary trisomic stocks.

Main Methods:

• Development of 15 B-A reciprocal translocation stocks with genetic markers.
• Creation of tertiary trisomic stocks (2n+1 aneuploids) utilizing B-A translocation elements.
• Introgression of stocks into the W22 inbred maize line for comparative analysis.
• Assessment of male and female transmission rates of B-A chromosomes.

Main Results:

• Successfully generated tertiary trisomic stocks from B-A translocations.
• Tertiary trisomics efficiently transmit hyperploid gametes maternally, contrasting with sperm aneuploidy from B-A translocations.
• Data on male and female transmission rates of B-A chromosomes in these stocks are presented.

Conclusions:

• Tertiary trisomic stocks derived from B-A translocations are effective tools for studying chromosome dosage and transmission.
• The study provides a foundation for comparing maternal and paternal effects of B-A chromosome transmission in maize.
• These genetic resources enhance the manipulation and analysis of chromosomal segments in maize.