Effect of Gamma Irradiation on Growth and Inflorescence Size in Curcuma alismatifolia cv.‘Red Shadow’
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Abstract
Patumma 'Dang Shadow' (Curcuma alismatifolia cv. ‘Red Shadow’) is a widely popular flowering plant variety cultivated as an ornamental plant in Thailand. This research aimed to study the effects of gamma radiation on the growth and inflorescence characteristics of 'Dang Shadow' rhizomes. Gamma radiation was administered at five different levels: 0 (control), 20, 40, 60, and 80 Gy, using 10 rhizomes per treatment level. The results showed that irradiated with 0, 20, 40, and 60 Gy were able to survive, with an LD50 value determined at 45.45 Gy. The 0 Gy showed the best results in growth, plant height and number of leaves. Conversely, the 60 Gy treatment resulted in the lowest plant height, with 10.17 centimeters. Regarding inflorescence characteristics, it was found that only the treated with 0, 20, and 40 Gy were able to produce flowers. The non- irradiated (0 Gy) exhibited the highest values for length and width of the inflorescence, length and width of the peduncle, number of upper and lower bracts, the size of both upper and lower bracts compared to the irradiated groups. Meanwhile, the 60 Gy resulted in the lowest morphological characters on the inflorescence. These findings demonstrate that appropriate levels of gamma radiation can be effectively utilized for breeding improvement or studying genetic variations in Patumma 'Dang Shadow'.
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