Basic content
I. Formation of beryllium seed
Americium is a plant of different species, and under natural conditions it is almost equal. The female and the male are born in the female and the male herbs, single or cluster, in bell form. Females are fertilized with pollinating fertilisation, with growth results, spherical berries, 7-8 mm in diameter, similar to peas, consisting of three parts of fruit peels, fruit meat and seeds. The fruit is green before maturity, gradually turning to light green, orange green, orange red, and red when mature, with three heartrooms with 1 to 2 seeds per room. Seeds are black, thousands weigh about 20 grams。
Ii. Selenium seed production
Neptunium is highly sophisticated and is generally used in cropping methods, i. E. Multi-year seeding with mother roots, which preserve the characteristics of the original species. The disadvantage, however, is that each year the strain is easily infected with the mother's root and causes death. As a result, our seeding technology has begun to be cultivated using group training methods, which are now effective and will be used and produced in the near future, so that china, which is completely dependent on foreign imports, will save the cost of seed cultivation. At present, aluminum seeds are mixed in male and female species and are grown in male and female terms。
Iii. Technology for the employment of pill abology
An increase in the proportion of males in daeda is an important means of seizing the high yield of platinum (precious tubers) as a result of the unsatisfied presence of males, the concentration of nutrients in the growth of the plume (eating part) and the 20-30 per cent increase in the production of females。
The seedlings of the male platinum can be obtained using tissue culture, but production equipment and technology are high. According to the test, the production is based on the use of a “female-to-male strain” method, which also provides access to an all-male herring seedling。
The prevalence rate of thorium is about 0? 01 per cent to 0 per cent? 2 per cent, with the same genetic type as the male. These “mixed strains” are used for self-intercourse or interlocking, with one quarter of the total male and one quarter of the total female offspring, while the remaining two quarters are identical. One fourth of the pure male strains are separated and paired with the female plant, so that all male seeds can be obtained. The operation is as follows: (1) carefully search for the same material in the medium- and later stages of the growth of the mother-plant of the pelican. At this point, female strains are generally exhausted, and it is possible to detect female and male strains from which female and male well-developed plants with few results are observed and their flowers are being opened. (2) using the above-mentioned female and male hybrids, the seeds obtained shall be sowed and removed separately in the following year; when they grow, the female and the male shall be numbered separately and then re-intersected manually and the seeds shall be collected separately. (3) female and male seeds will be planted separately from the third year, and when they are flowered, they will be pure male if all of them are found to be male, and the seeds produced by them will be pure male seeds, which will be used for field production, so that all of the beryllium seed will be produced。
Iv. Methodology and development of ground reduction technology
The group selection method, i. E. The selection of female and male strains from a group that meet the requirements for breeding, is most used for the seeding of platinum. Despite a marked increase in the genre of seeds grown in this method, their offspring are divided into large numbers and are subject to extensive cultivation observation. At the current stage, four more methods are used for the breeding of aluminum seeds: the first is conventional breeding, mostly single-crossing, and the second is hybrid. Single fertility is characterized by parents being limited to two strains, the geneticity of the offspring being more consistent with that of the group, and the amount of seeds received. The hybrid approach is characterized by a high number of hybrid seeds, lower seed costs and more complex planting procedures. The common disadvantage is that they have longer breeding times. Second, new varieties are developed using the high-intensity, non-sexual systems, rapid access to cloning systems with one or some of the best characteristics, combined with hybrid sex technologies. The third is the whole male species, which are regenerated by single or double cells derived from the use of flowers, and which, after artificial or natural doubling, acquire a pure or super-male plant with yy-sexual chromosomes, which is ultimately used in production through ion proliferation, natural screening and evaluation tests. In addition, all male varieties can be developed using gender strains found in the fields. Fourth, genetically modified varieties are developed to improve the selection and reproduction of cytogenesis by using cell integration or the introduction of dna by peg or electro-generic methods。
V. Temperature conditions for the emergence of beryllium seeds
The seed of americium is born at a minimum of 5°c, and the temperature is reduced to below 5°c, with little or no gerontology, below 15°c, and a marked decrease in gerontology. In low-temperature areas, therefore, it takes a considerable period of time for early spring seeding to take place, and attention must be paid to taking certain measures before seeding takes place, as well as to some temperature protection after seeding. The most appropriate temperature is 20-25°c for seed growth, with a gerontization rate of over 90%. The seed will be placed at 25°c and it will begin to sprout for about three days, with most of the seed sprouts occurring over 10 days. At 25-30°c, seed sprouts begin earlier, but the sprouts are longer and take place less than 20-25°c. Seed sprouts have declined significantly under conditions above 30°c, and they have largely stopped at more than 35°c. Selenium seeds have a very low bulging and bulging rate at higher temperatures, which may be associated with a-thinase activity that decreases rapidly with the length of the bud. Within a given temperature range, the growth rate of temperature-induced buds is better than that of constant temperature-induced buds, especially when the effects of low-temperature processing are more evident. The bulge rate is as high as 98 per cent, using 25°c during the day and 20°c at night。
