Chen Cheng really didn't expect that a small brown streak disease would be so difficult to deal with.

He had thought too much about it, thinking that as long as the diseased leaves were removed and the fields were disinfected, the problem could be solved.

Unexpectedly, the mud and the lower part of the lotus root mud have been infected with brown streak bacteria!

"It seems that the lotus root brown striae disease in Xiting County this time is too serious!"

The lotus root brown striae spore bacteria are harmless to the human body and do not affect the taste of the lotus root, so their batch of lotus roots can be sold normally, but what will they do in the coming year?

Lotus root is a perennial plant, and digging the root root is the part left in the mud to directly develop new plants in the second year. But now the lotus root has been infected with germs, and it will inevitably be transmitted to the next year's plants.

Changing species is definitely going to be changed. However, the lotus root is manually pulled out by hand section by section, and no one can guarantee that the lotus root in the mud will be dug clean.

It seems that it is necessary to start from the genes of lotus root and completely solve the problem that it is susceptible to brown streaks.

This is just one of them, and the other is how to maintain this year's lotus root production.

This is the problem that Chen Cheng must solve today.

From the current point of view, just applying pesticides will not solve the problem at all, let alone maintain production.

Chen Cheng thought about it and decided to solve the problem of reducing production this year first, and then carry out research on genetic modification of lotus root.

According to the characteristics of this lotus root variety in Xiting County, it enters the lotus root picking period after two months. That is, he must let the lotus root in the mud continue to develop within two months.

The lotus root is a place where nutrients are stored, and in order to continue to develop, it must be continuously fed with nutrients, and the nutrient-producing organ of the plant is the leaf.

The problem is back to the blades.

At present, almost all the lotus leaves of lotus roots are dead, and it is almost impossible to continue to produce nutrients, and the technical solution is to let them germinate new leaves again.

But the germ is still there, and even if it sprouts new leaves, it will soon be damaged by brown streak disease and lose its function.

Going around and around, you can't avoid the treatment of brown streak bacteria.

There will be leaves in the water, and there will be in the water to sanitize the soil, even if the soil can be sanitized again, there is still in the lotus root.

It is difficult to completely eradicate it. It is simply impossible to eliminate it if you want to preserve production!

"Is there a way to stop it?"

Chen Cheng had an idea and changed his thinking.

"Search for the growth habits of brown streak fungus spores!" Chen Cheng said.

[Brown streak fungus: Brown streak, also known as brown spot disease, is mainly a fungal disease caused by Rhizoctonia solizum]

[The causative agent of brown streak disease is cercospora, and the conidia are brown and bunched. The conidia are colorless, whip-shaped, with 3-7 septa. Size 30-983.4-4 μm. The optimal temperature for the growth and development of this bacterium is 27-30 °C, and the development stops above 37 °C or below 5 °C, and the lethal temperature is 45 °C, which can be inactivated in 10 minutes.

[The pathogen overwinters in dead leaves or soil with mycelium or conidia, and begins to occur in early summer with the help of wind and rain, and in autumn, the harm is serious, high temperature and humidity, insufficient light, poor ventilation, continuous cropping, etc. are conducive to the occurrence of diseases]

After reading the introduction of brown streak bacteria, Chen Cheng understood why lotus roots are prone to brown streaks.

The bacteria spread in the wind and rain, and the plants growing on the ground are less likely to be infected with the bacteria by the wind, while the probability of infection of the lotus root soaked in water for a long time is greatly increased, which is why the floating leaves of the lotus root are the first to be infected with the disease.

Summer is the most vigorous stage of lotus root development, lotus leaves are staggered, hot and humid, and each condition is conducive to the rapid reproduction of brown streak bacteria.

At the same time, the introduction also pointed out the direction for Chen Cheng.

That's the ambient temperature.

At temperatures below 5°C, the brown streak bacteria will go dormant and will not be multiplying and infectious.

The breakthrough is here.

Chen Cheng checked the temperature change in Chaxiting County in the last month.

At present, the local temperature is about 10~17 °C, but after more than 20 days, it will enter a large cooling period, and the minimum temperature will be reduced to 4 °C.

That's right, as long as the minimum temperature is lower than the germ's breeding temperature, it will go dormant and will no longer be widely infectious.

Although he found a way, Chen Cheng was not happy at all.

The lower temperature can indeed limit the reproduction of germs, but the lotus leaf also cannot survive.

At temperatures below 10°C, the lotus leaf cells will rupture and then wither, and the accumulation of nutrients will not be realized.

"The First Evolution"

"Simulating the growth of lotus root after adding different proportions of gibberellin and cytokinin."

Chen Cheng felt that it would be simulated first, after all, it was easy to make mistakes by inference.

Gibberellin and cytokinin are plant hormones that promote cell division, induce bud formation and promote their growth, which can accelerate the elongation of cells and promote the differentiation and growth of various tissues.

【Okay】

After receiving the instructions, the supercomputer started the simulation and gave the results in less than a minute.

[After adding 12% cytokinin and 25% gibberellin, the lotus root plant sends out new leaves after 10 days, and the balance between nutrient consumption and income is achieved after 15 days, and after 20 days, due to the sudden drop in temperature, the lotus leaves wither, and the new lotus leaves lose all their functions after 40 days]

"Hiss~ That's true!"

Chen Cheng was not too disappointed, he could only say that the simulation results were consistent with the speculative results, and there was no surprise for him.

One of the most valuable results of the simulation is that "nutrient consumption and income balance will be achieved after 15 days".

That is to say, on the 15th day, the nutrients consumed by the newly sprouted lotus leaves of the lotus root are equal to the nutrients they produce, and after that, the lotus leaves insist on one more day, and the lotus root earns one more day of nutrients.

So at present, we need to find a way to make lotus leaves resistant to low temperatures, so that they can survive in low temperature weather for as long as possible.

Chen Cheng called up the 3D virtual image of the lotus root after the second development simulated in the supercomputer, operated it with his fingers, and carefully examined it.

Through observation, Chen Cheng found that the floating leaves of this variety of lotus root are very large, with the largest leaf diameter of 60cm, floating on the water surface, like an umbrella cover. The leaves are not large, and the largest diameter is only 30 cm, which is the size of a straw hat.

Chen Cheng clicked on the button of [Dynamic Growth Process], and the 3D virtual lotus root began to evolve gradually from the application of auxin.

The awesome thing about the system is that it can mark and display the movement of nutrients, water, etc. in the whole process within the plant.

"Stop!"

Chen Cheng keenly found that when the low temperature came, the flow rate of nutrients and water in the lotus leaf meridians gradually decreased, and although the cell activity decreased, it was still working normally. When the minimum temperature drops to 0°C, all cells are suddenly destroyed, and then they gradually wither from the outside in.

“0℃？ Icing causes cell death in leaves? ”

Chen Cheng zoomed in on the 3D model to the extreme, and sure enough, he found that it was the ice that caused the rupture of the leaf cells.

Lotus root is a temperature-loving plant, in order to adapt to the environment, its leaf stomata are wide open, and the leaf cell wall is very thin, but the cell activity is strong, and the water content in it is very full.

This is great for growing in the summer, but it can easily freeze to death in the winter.

Chen Cheng slapped his head, then it was the opposite!

"Simulating the results of reduced leaf cell water content and reduced cell viability!" He hurriedly said.

【Okay】