栓皮栎体细胞胚胎诱导的研究
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摘要
栓皮栎(Quercus variabilis Bl)是我国最重要的软木资源树种。其种子
    不耐贮藏,扦插繁殖困难,目前主要依靠天然更新。本研究以栓皮栎未成熟合子
    胚、成熟合子胚和2~4周龄的实生幼苗茎段作为外植体,诱导体胚发生。系统地
    研究了栓皮栎体细胞胚胎发生和植株再生所涉及的各种影响因素和体胚发生发
    育过程中的组织学和细胞学特征。研究成果将为栓皮栎优良无性系繁殖、基因保
    存、遗传改良,以及人工种子生产奠定基础。具体结果如下: 
    1. 未成熟合子在 MS 和 WPM 基本培养基上均能诱导出体胚。两者相比,培养于
     MS 上的合子胚不但生长健壮,诱导出的体胚数量较多,个体较大,而且体胚
     诱导率也较高。16h.d-1 光照培养和暗培养条件,体胚诱导率无显著差异,但
     光培养下的体胚生长迅速而且健壮,暗培养下的部分体胚在发育的过程中会
     愈伤组织化且诱导出的胚性愈伤组织在去掉激素后需要较长的时间才能分化
     出体胚。
    2. BAP 与 TDZ 单独使用时,均以直接体胚发生为主,但前者诱导出的体胚数量
     较多,质量高,发生早,发育快。二者分别与 2,4-D 配合使用可以显著提高
     诱导效率,以间接体胚发生为主。
    3. 7 月中旬采的未成熟合子胚体胚诱导率较高,6 月中旬和 8 月中旬的未成熟合
     子胚体胚诱导率较低,只有个别成熟合子胚诱导出体胚而幼苗茎段未能诱导
     出体胚。不同发育时期的未成熟合子胚对激素配比要求也有一定差异。7 月
     中旬的未成熟合子胚对激素浓度适应范围较广,但以同时附加 0.1 mg.L-1 
     2,4-D 和 0.5 mg.L-1 BAP 诱导效果为佳,8 月中旬的未成熟合子胚要求较高浓
     度的 2,4-D,而 6 月中旬未成熟合子胚则正好相反。
    4. 同一时间采自同一母树上的不同大小的未成熟合子胚体胚诱导率无显著差
     异,但采自不同母树上的未成熟合子胚体胚诱导率差异很大。未成熟合子胚
     的手术不利于体胚发生,全胚接种不仅诱导率最高,而且长出的体胚数量也
     多,品质也好。胚轴是体胚发生的重要部位,具胚轴的合子胚片段体胚诱导
     率显著高于无胚轴片段。合子胚的手术对体胚诱导率的影响可以通过在培养
     剂中添加 2,4-D 而得以部分补偿。
    5. 栓皮栎体胚增殖较为适合的培养基为附加 0.5 mg.L-1 BAP 的 MS 培养基;体
     胚成熟较为适合的培养基为附加含有 4~5%的蔗糖的 MS 培养基,而 ABA 并不
     能有效地促进体胚成熟;体胚萌发较为适宜的培养基为 1/2MS 培养基。光培
     养和暗培养下萌发率无显著差异,但暗培养不利于体胚苗的展叶,所以
    
    
    16h.d-1的光照条件对栓皮栎体胚萌发较为适宜。萌发培养基中添加BAP和IBA
     均不利于体胚的正常萌发。0.3 和 0.7mol.L-1 的山梨醇渗透预处理 15d 和冷
     处理 15d、70d、90d 对体胚萌发率均无显著影响。
    6. 组织学观察表明栓皮栎次生体胚和间接体胚为单细胞外起源。个别原胚具有
     “胚柄” 状结构。个别成熟体胚的子叶中有成片的多核细胞存在,核数最多
     达 34 个。
    7. 观察 8 个多月的胚性愈伤组织染色体标本,其中四倍体细胞占 1. 87%,单倍
     体细胞占 0.93%,二倍体细胞占 97.20%,未发现有异形核和明显的染色体形
     态结构变异和非整倍性变异。
Quercus variabilis is one of the primary sources of industrial cork in China.
    Presently its stands were established mostly by natural regeneration as a result of
    difficult to storage seeds and conventional vegetative propagation such as cutting.
    Immature and mature zygotic embryos as well as young stem segments of seedlings
    were used as a source of initial explants. We studied on the effects of factors and the
    histological and cytological characteristics that related to the somatic embryogenesis
    and plant regeneration of Q. variabilis. The results would lay a good foundation for
    propagation excellent clones, gene preservation, genetic improvement and large-scale
    artificial seed production for Q. variabilis. The results were as follows:
    1. Somatic embryos can be induced on MS and WPM medium with immature
     zygotic embryos. MS medium with 16 hours light condition was more favorable
     to embryogenesis. Higher embryogenic responses were gained on MS medium
     than on WPM medium. Although the embryogenic responses were not significant
     with light conditions, better quality was reached at 16 hours light condition than at
     dark condition.
    2. Direct somatic embryos were gained on MS medium with BAP or TDZ
     individually. And the quality of the somatic embryos induced on the former was
     higher than on the latter. Indirect embryos were also gained on MS medium
     containing 2,4-D, BAP or TDZ individually. Higher inducing rates were obtained
     on MS medium with BAP and 2,4-D.
    3. More efficient induction of embryogenic cultures was achieved from the immature
     zygotic embryos sampled in middle of July. The embryogenic responses from
     mature zygotic embryos were very low and there was no somatic embyogenesis
     responses from young stem segments of seedlings. The requirment for
     combination and concentration of phytohormones changed with the developing
     time of immature zygotic embryos: immature zygotic embryos sampled in middle
     of July adapted larger range combination and concentration of phytohormones,
     but 0.1 mg.L-12,4-D combined with 0.5 mg.L-1 BAP got a better result; those
     sampled in August needed higher 2,4-D concentration, while those sampled in
     June needed lower 2,4-D concentration.
    4. The immature zygotic embryos sampled from different individuals were
     significant in the embryogenic responses. But there was not significant with
     different scales sampled from the same individual. Surgery on the immature
     zygotic embryos was not favorable to embryogenesis and inoculating entire
     zygotic embryos got higher embryogenic responses. The hypocotyl was important
     section to embryogenesis, and the embryo segments joined to the hypocotyls got
     higher embryogenic responses than those without the hypocotyls. It could
     compensate the decrease of embryogenic response by adding 2,4-D in cutting
     treats culture.
    5. MS with 0.5 mg. L-1 BAP could meet the need of proliferation of somatic embryos.
    
    
    Somatic embryos cultured on MS media contained 4~5% sugar got higher
     maturation rates, while ABA had not significant effect on maturation. The mature
     somatic embryos were transferred into 1/2MS medium with 16 hours light
     condition got a better germination rate. Although the rooting rates, shooting rates
     and geminating rates were no significant at 16 hours light condition and at dark
     condition, the dark culture was not favorable to leaf spread. 0.3 and 0.7mol.L-1
     sorbitol desiccation lasted for 15 days and 4℃ chilling lasted for 15,70 and 90
     days had not significant effect on germination rate.
    6. Histological study showed that secondary embryos derived from epidermal cells
     and from subjacent cells of somatic embryos by unicellular pathway and
     multinuclear cells were very common in cotyledon of some somatic embryos and
     34-nuclear-cell was found occasionally.
    7. By analyzing chromosomes with 8 months of continuous subculture somatic
     callus tissue cell demonstrated that there were 1.87%
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