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1·The lower ploidy materials, the higher chromosome doubling frequency.

倍性低的材料加倍率较高。

2·The chromosome doubling of haploid and double haploid in cucumber was studied.

进行了黄瓜单（双单）倍体染色体加倍试验。

3·If artificial chromosome doubling in vitro is used, a high-efficient tissue culture system must be established.

而要利用组织培养对离体组织进行染色体加倍，首先要建立高效的组织培养再生体系。

4·Chromosome doubling for somatic cells and somatic hybridization via cell fusion are effective methods to create polyploidy.

细胞融合和体细胞染色体加倍是获得杨树多倍体种质的有效途径之一。

5·This indicated that different response existed in some distinct genotypes to chromosome doubling through treating in vitro microspores with colchicine.

由此说明，基因型对秋水仙碱处理离体小孢子诱导染色体加倍的反应不同。

6·A poisonous, pale-yellow alkaloid, C22H25NO6, obtained from the autumn crocus and used in plant breeding to induce chromosome doubling and in medicine to treat gout.

秋水仙碱一种有毒的、淡黄色生物碱，c22h25no6，从秋天的番红花中提取，用于植物生长中的染色体加倍和用于治疗痛风。

7·Results are as follows: 1. Axillary buds culture and callus differentiation were studied in this paper, which provide experience for in vitro chromosome doubling and protoplast culture techniques.

主要研究结果如下：1。研究了小青杨单芽茎段培养和愈伤组织再生技术，为进一步开展离体叶片细胞染色体加倍以及原生质体培养奠定了基础。

8·The haploid plant is the best material for genetic research of carrot, and homozygous diploid formed by doubling chromosome of the haploid plant is also the best resource of breed seed selection.

而单倍体植株是胡萝卜遗传研究的最好 材料，由单倍体植株染色体加倍而成的纯合二倍体，又是品种选育的最好资 源。