29th International Horticultural Congress on Horticulture - Sustaining Lives, Livelihoods and Landscapes (IHC) / International Symposium on Plant Breeding in Horticulture, Brisbane, Australia, 17 - 22 August 2014, vol.1127, pp.389-393
Mutation breeding is one of the methods that is most used for ornamental plant breeding. Through this method, the most commonly seen features among new cultivars of ornamental plants are changes of colour, texture and shape of flowers and leaves, endurance of plants, plant growth type and the difference of flowering time. In this study, Crocus flavus 'Golden Yellow' was used. The objective was to create variation by gamma irradiation and to improve traits by mutation breeding. Corms of 'Golden Yellow' were irradiated with gamma rays at seven doses: 0, 5, 10, 15, 20, 25 and 30 Gy. The effective mutation dose (EMD) was calculated as 43.10 Gy at the M1V1 vegetation period. In the M1V3 period, some changes were observed in flowers and leaves of the plants. For flowers, changes were observed in stigma formation and tepal differentiation. The changes in the tepals were a doubling of the outer tepal, formation of a new small tepal in the middle of the flower and changes in the number of tepals. For the leaves, the number of white-surfaced grooves on the upper side changed and some sticked leaves were seen. We observed 25 different plants from the 5 and 10 Gy groups, 31 plants in the 15 Gy group and two plants each from the 20 and 25 Gy gamma-irradiated groups. Information for plant passports was prepared for each plant.