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Effect of r-ray on the Growth of Poinsettia

By 傅仰人, 朱建鏞, 黃敏展, Yang Jen Fu, Chien Young Chu and Min Chang Huang


以γ-射線照射聖誕紅的插穗、發根苗及盆苗,期能誘發雙異,育成新品種。試驗使用'Peterstar'打發根苗為材料,處理γ射線0、25、35、45、50及l00格雷(Gy)劑量之結果顯示,隨劑量增加而使根部之傷害嚴重,株高之生長抑制也愈明顯,超過45Gy則植株均不能成活。其中以25Gy劑量照射者變異率為3.5%,而35Gy劑量照射者變異率為2.3%。另以'Peterstar'插穗先行25Gy照射,經扦插4週發根完全後再行25Gy照射,則變異率增為6.7%。而''Peterstar'發根苗上盆後以25Gy劑量照射一次,間隔3週再行25Gy劑量處理之分次累積照射時,其變異率可達4.3%。以對照組生長速率為100%,比較經γ-射線處理的植株的生長,發現相對生長速率為33-37%時變異率最高。不同品種聖誕紅經γ射線照射後之當代側枝變異率,'Peterstar'或'Freedom'分別為5.4%或7.3%之間,而'Lilo'及'Supjibi'品種則沒有變異產生。花色變異'Freedom'佔51.3%,而'Peterstar'佔28.6%。This study γ-ray irradiated on the unrooted, rooted cutting or potted p;ants to induce mutants for poinsettia breeding. The rootrf 'Peterstar' cuttings were treated with γ-ray at 0, 25, 35, 45, 50 and 100 Gy. The higher γ-ray irradiated the more damage was on the root, as well the more inhibition was on the shoot growth. There was no survival when the dose was over 45 Gy. Rooted 'Peterstar' treated with 25 Gy was induced 3.5% mutatioon and treated at 35 Gy was induced 2.3% mutation. Cuttings were irradiated at 25 Gy before inserting and cutting and re-irradiated 4 weeks after, the growth rate was 37.7% and the mutation rate increased to 6.7%. Potted poinsettia of 'Peterstar' irradiated γ-ray at 25 Gy and re-irradiated again 3 weeks later, the growth rate was 33.1% but the mutation rate was 4.3%. They were better than once irradiation decreased the relative growth rate 33-37% it was suitable dosage. Poinsettia of ;Peterstar' or 'Freedom' treated with γ-ray the mutantion types of bract color was 28.6 or 51.3% in the total mutants of 'Peterstar' or 'Freedom' , respectively

Topics: mutation breeding, irradiation, poinsettia, r-射線, 聖誕紅, 誘變育種
Year: 2014
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