Segregation of Morphological Characteristics of Tetraploid Torenis Hybrid (Torenia fournieri x Torenia baillonii) in F2 Population

Abstract

Diploid Torenia (Torenia foumieri x Torenia baillonii) is sterile, and chromosome number is 17  (2n=2x=17). They were duplicated chromosome number with colchicine tablets. There are 34 chromosomes (2n=4x=34). Which are fertile in tetraploid population. Morphological segregations were studied in F₂ population. Seeds were harvested at 30 days after selfing, then were sew in peat moss with 500 ppm GA₃. Two hundred and fifteen plants were studied segregation at the Horticulture Department University, Bangkhen campus. The results were shown continuous segregations in plant heights, which were between 4-30 cm, 2.6-41 cm for plant canopies, 1-32 cm for leaf widths and 1-3.9 cm for leaf lengths respectirely. Flower colours were shown the continuous segregation in blue and yellow colours, the flower colour were depended on blue – yellow colour ratio. Discrete segregations were found in leaf and stem colour, the ratio was 3:1 in red and green colour. Segregations were not found in leaf shape and clambering. This result suggested that some chromosomes were homologous.