羽衣甘藍(lán)游離小孢子培養(yǎng)與再生體系構(gòu)建
[Abstract]:Brassica oleracea var. acephala is rich in vitamins, mineral elements and some biological active ingredients. It has strong cold resistance. Therefore, it can be used as a vegetable in cold winter and can assemble colorful winter flower beds. Free microspore technology is one of the fast ways to obtain pure inbred lines. Therefore, increasing the rate of free microspore embryogenesis and the rate of direct embryoid regeneration can shorten the time of obtaining homozygous inbred lines and improve the breeding efficiency. The construction of in vitro regeneration system of cabbage is an effective method for expanding the propagation of isolated microspore single plant. In this study, a high efficient and stable regeneration system was established and a large number of homozygous clones were obtained by using the excellent homozygous breeding strains obtained after free microspore culture. Five factors affecting embryogenesis in spore culture were genotype, developmental stage, sucrose concentration, low temperature pretreatment and high temperature heat shock. The effects of direct embryoid regeneration on seedling formation, how to obtain robust plants, and the factors affecting bud induction were discussed. The main results are as follows: 1. In the process of microspore induction, 12 of 19 materials were able to obtain embryoids. Among them, the highest embryogenic rate was'Red Peacock', and the lowest was'6BZ', among which'42 Red','42 White','edible','DHZ,'DFZ','black wrinkle-powder', and'D10 x 6BZ'seven genotypes were not obtained after repeated culture experiments. 2. Bud size can reflect the microspore development process, but the microspore development stages of different genotype materials are very different. When the bud length of kale is 2.51-4.00 mm, the free microspore is generally in the early stage of monocyte. The free microspore of different genotypes of Brassica oleracea had different requirements on the time of low temperature treatment. Generally speaking, the embryo yield of each genotype was increased when the bud was pretreated at low temperature for 24-48 hours before microspore culture. Heat shock at 33 C for 24 to 48 h promoted the embryogenesis of microspore embryoids in Brassica oleracea L. Different genotypes had different requirements for suitable sucrose concentration. Generally speaking, the sucrose concentration suitable for microspore culture was 130 g L ~(- 1) and 160 G (- 1). 4. Before induction, the cotyledon embryoids could be induced more successfully than other embryoids. MS was the most suitable medium for cotyledon embryoids to regenerate seedlings directly, and it was easier to regenerate seedlings directly. The best ratio of hormone concentration for embryoid regeneration of Brassica oleracea L. ~(-1) 6-BA + O.1 mg (-1) NAA was 0.2 mg L (-1) NAA. Adding appropriate concentration of NAA to 1/2 MS medium could significantly promote the growth and rooting of microspore plants. In the process of bud induction and regeneration, axillary bud is an ideal regeneration explant material. Adding a certain concentration of 6-BA on the basis of adding NAA in the medium can promote the healthy growth of regeneration bud. The optimum ratio of hormone is MS + 1.Omg (-1) 6-BA + 0.05mg (-1) NAA. 6. Adding suitable concentration of NAA in the medium is the best way to induce axillary bud regeneration. When the concentration of NAA was 0.2 mg (-1), the bud growth vigor was the best, the leaf color was oily green, the leaf area was the largest, the stem was strong, and the growth was vigorous. 7. Root length was 0.5-1.5 cm, which was the best medium for the regeneration of strong seedlings. In the later stage, the seedling mortality rate was low, and the plant growth condition was the best.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:S681.9
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