How to cooperate in cotton breeding, and how to talk about details

First of all, gene technology is at the molecular level, and the others are at the cellular level.

Cloning does not alter traits.

Hybridization results in gene segregation (yielding trait segregation).

When looking at it again, it is recommended that you start with 1: self-crossed blending method, "" inside is the word written on the horizontal line after "" 2: Because the cotton suitable for planting in each region is different, it is difficult for you to only say a local.

Breeding programs in terms of salinity tolerance and other aspects are provided as follows: 1. Each variety has its own advantages and disadvantages. Drought Resistance 4:

Single plant selection nursery (final selection of 200 inbred single plants) - plant identification nursery (100 inbred lines selected by the source of tremor) "self-breeding" - seed preservation nursery (100 lines) "bent quietly through self-breeding" - basic seed field - original seed field Note, the specific depends on what variety and insect resistance 3Disease resistance 2 disadvantages、{} inside is written on the word "buried hole slag" in front of {} 3

Disadvantages: Because the cotton suitable for planting in each region is different, it is difficult for you to only say a local, it depends on what variety, each variety has its own advantages and disadvantages, and then it is recommended that you start from 1Disease resistance 2, insect resistance 3Drought Resistance 4:salinity resistance, etc.

The breeding program is provided as follows:

Self-crossing mixed multiplication:

Single plant selection nursery (200 inbred single plants) - plant identification nursery (100 inbred lines) "self-bred" seed preservation nursery (100 lines) "self-inbred" - basic seed field - original seed field.

Note: 1. The words in "" are written on the horizontal line behind "" 2, and the words in {} are written on the front of {}.

3. From the seed preservation nursery including the seed preservation nursery to the future, it is carried out in a cycle.

First, the imported gene (Verticillium wilt resistance gene) is obtained, and then the imported gene is bound to the vector (plasmid, etc.). Prepare cotton seedlings, take their subcotyl shafts, and cut them into small segments as exocolones.

Then, the target gene was introduced into these small segments by Thickening Bacillus infection, co-cultured on a medium with filter paper, and after the infection was completed, it was washed with antibiotics to remove the uninfected Thickening Bacillus.

Then, the calli are cultured on the medium to obtain callus, and the good ones are selected until they are grown into seedlings.

Finally, plants with antimicrobial genes (marker genes) are selected for antibiotics, and these plants are given yield increasing genes. Breeding is carried out again.

The process lasts for a long time.

Cereals provide 70% of the calories in human food, but they are lower in protein. Since the discovery of the high-protein gene of winter wheat in the 50s and the discovery of the high-lysine mutant Opec 2 (O2) in maize in the early 60s, quality breeding has made rapid progress. Some winter wheat varieties with yields not lower than those of the original varieties and with an increase in protein content of 1 2 per cent have been promoted in the United States.

The International Maize and Wheat Improvement Centre has also bred improved maize populations with O2 high lysine gene and hard endosperm. In terms of oil crops, the Soviet Union has increased the oil content of sunflowers from 30% to about 50% in the past 50 years through reincarnation selection. Canada, for its part, has been successful in canola with low erucic acid and low glucosiosides.

While continuously improving the fiber quality, cotton quality breeding is further committed to the breeding of cotton varieties with high oil content, gossypol-free and high protein, which may make cotton a crop with both cotton and oil. Progress has also been made in forage crop breeding to breed varieties with little or no harmful components.

Mexico has a longer history of cotton planting. Today, more than 90% of the world's total cotton production is native to Mexico, which is the origin center of upland cotton, and Mexico is known as the "homeland of cotton". It provides rich and diverse germplasm resources and wild cotton varieties for the world's cotton breeding and improvement, and is known as the world's natural cotton germplasm base.

Nine of the 32 wild species of the genus Cotton have been identified worldwide as being native to Mexico. Mexico's National Cotton Research Center is headquartered in Mexico City. It will collect 120 wild and semi-wild specimens of 19 cotton species and plant them in the Institute's cotton germplasm resource plantation.

Since the 80s, the national agricultural research unit and private farms have jointly signed a contract to set up a research project specializing in the breeding and cultivation of colored cotton, and great progress has been made, and different colors of cotton such as brown red, earth yellow, and camel have been cultivated. According to records, the Uya and Asidec people in Mexico have cultivated colored cotton before the era, and when the Spaniards entered southern Mexico and the Yucatan Peninsula in the 16th century, the local cotton planting industry has been very developed, and the islanders spun the colored cotton into homespun cloth and made it into the national costume that Mexicans love to wear, and it is very popular to sell it in the market.

Now there is colored cotton. In addition to white, there are browns, greens, yellows, reds, and purples, but the colors are not bright. In 1994, China began the research and development of color cotton breeding, and has now bred brown, green, yellow, red, purple and other colors of color cotton.

It's a problem with the spinning process. Maybe it's because the cotton is not good. After that, there can be a way to modify the fabric.

Spinning is also easy to say. But to spin high-quality cotton yarn, then there is learning. Uniformity is the key to stable production and quality assurance.

It can be said that it is the connotation of cotton spinning project. Evenly grip the cotton. Evenly conveying cotton.

Store cotton evenly and in the right amount. Uniform and proper opening and impurity removal. Homogeneous blend blend, uniform cotton layer of cotton mesh and tampon slivers.

Spinning is also easy to say. But to spin high-quality cotton yarn, then there is learning. Uniformity is the key to stable production and quality assurance.

It can be said that it is the connotation of cotton spinning project. Evenly grip the cotton. Evenly conveying cotton.

Store cotton evenly and in the right amount. Uniform and proper opening and impurity removal. Homogeneous blend blend, uniform cotton layer of cotton mesh and tampon slivers.

And -

Look at the draft of the rear area of your spun. Reducing to a multiplier for spacer blocks can also be reduced by multipliers of your existing backspace.

The first is that the temperature and humidity control is not good, the second is the small leakage of the carding bottom, and the third is the problem of rough drafting parts.