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大苞鞘石斛(Dendrobium wardianum)离体培养与快速繁殖的研究
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摘要
本论文以大苞鞘石斛(Dendrobium wardianum)的种胚为试验材料,对其胚培养和快繁技术进行了系统的研究,建立了大苞鞘石斛的快繁技术体系,为种质资源的保存奠定了基础。
     试验结果表明,在开花第5 d时授粉(花瓣完全展开当天)结实率最高,结实率为80.95%,种子有胚率为90.73%。将种胚播于B5+绵白糖20 g?L-1+椰乳20%+ pH 5.4上,培养50 d后萌发率达79%。而后转接于花宝1号3 g?L-1+蛋白胨2 g?L-1+NAA 0.2 mg?L-1+椰乳10% +马铃薯提取液10%+葡萄糖20 g?L-1+pH 5.6上进行分化培养,培养时间70 d。选取分化后的小苗接入CHB+ NAA 0.5 + 6-BA 0.2 +椰乳10% +蔗糖30 g?L-1+pH 5.8进行丛生芽增殖培养,培养150 d后增殖系数为6.68。将增殖后的无菌大苗转入花宝2号3 g?L-1+蛋白胨2 g?L-1 +IBA 1 mg?L-1+ CW 10%+蔗糖30 g?L-1+pH 5.6进行生根诱导,培养45 d后诱导率100%,平均根数2.3条。最后在花宝1号3 g?L-1+蛋白胨2 g?L-1+蔗糖30 g?L-1 +活性炭1 g?L-1+pH 5.6做壮苗生根培养,培养90 d后即可炼苗并移栽于松树皮+珍珠岩+兰花基石(1:1:0.5)中,基质采用高压蒸汽灭菌消毒(121℃,120 min),移栽成活率92 %。
     利用拟原球茎增殖的方法:选取植株健康、长势健壮,株高在2㎝以上的无菌苗,每1~2节为一段,接入诱导培养基1/2MS+2.4-D 0.2 mg?L-1+蔗糖30g?L-1+pH 5.8,20 d后,拟原球茎约为1.2~1.5㎜时将拟原球茎剥离,并接入同种培养基继续诱导;15~20 d转瓶增殖培养,最优培养基为1/2MS+NAA 1 mg?L-1+椰乳10%+蔗糖30 g?L-1+pH 5.6。25~30 d需转接1次,增殖系数为7.33。拟原球茎分化最优培养基为1/2MS+NAA 0.5 mg?L-1+蔗糖30g?L-1+椰乳10 %+pH 5.6。
The paper took the seeds of Dendrobium. wardianum as research objects. This thesis had a systematic research on the embryo culture and rapid propagation. It was laid the foundation for the preservation of genetic resources and rapid propagation system establishment.
     The results showed that the best pollination time of the female flower(mother) was after blooming of 1 day when not only would the capsule setting rate be reached 80.95% but the plump seed ratio be reached 90.73%.Seeds of Den. wardianum cultured on the media of B5 +Sugar20 g?L-1 + CW20 % + pH 5.4 for 50 days and the germination rate was reached 79%. The optimal differentiation medium of protocorm from former stage was Hyponex No.1 3 g?L-1+Peptone 2 g?L-1+NAA 0.2 mg?L-1+CW 10% + Potato extract 10%+Plucose 20 g?L-1+pH5.6 and the protocorm was cultured 70 days. The proliferation medium for adventitious buds was CHB+ NAA 0.5 + 6-BA 0.2+CW10%+Sugar 30g?L-1 +pH 5.8.It was 150 days for this culture stage and the multiplication coefficient was 6.68.The aseptic seedling which obtained from the former culture stage were cultured on the root induction media of Hyponex No.2 3g?L-1+ Peptone 2 g?L-1 +IBA1 mg?L-1+ CW 10%+ Sugar 30 g?L-1 +pH 5.6 for 45 days ,with the rooting rate at 100%,and the average root number of 2.3. The last stage of in vitro was strong plantlets and rootage. The optimal medium was Hyponex No.1 3 g?L-1+ Peptone 2 g?L-1 +Sugar 30 g?L-1 + Activated carbon 1 g?L-1+pH 5.6. 90 days later the plantlets were hardening-seedling and transplanting in the materials mixed pine bark with perlite and orchid matrix, ,with the survival rate at 92%.The culture substrate was sterilized with high pressure steam(121℃, 120 min).
     Aseptic seedling with strong growth vigor and 2㎝ height was adopted for the PLBs induction materials. Shoot segments with 1-2 nodes were excised from Den. wardianum plants raised in vitro. The segments were cultured on the media of 1/2MS+2.4-D 0.2 mg?L-1+Sugar 30g?L-1+pH 5.8 for 20 days.When the shoot bud diameter reached to 1.2-1.5㎜, it must be detached and transferred to the same media for 15-20 days.Then the PLBs subcultured on 1/2MS+NAA 1 mg?L-1+CW10%+Sugar 30 g?L-1 +pH 5.6 for proliferation with the proliferation rate at 7.33.The PLBs transferred to the 1/2MS media within 25-30 days.The optimal PLBs differentiation medium was 1/2MS+NAA 0.5 mg?L-1+Sugar 30 g?L-1+CW 10%+pH 5.6.
引文
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