seeding 176 copies of the material to search for the extension of the high yielding sea rice
"the 176 marine rice materials we have cultivated in the southern propagation base, which are about to sow five typical saline soils." Zhang Guodong, deputy director of Qingdao seawater rice research and development center, said.
seawater rice is not grown in seawater, its soil is saline alkali soil. Generally, the salt tolerance of rice varieties is below 3 per thousand. In the world "brackish water" area, many wild rice resources with salinity tolerance of 3 to 12 per thousand have been found, but they are generally low yielding. "Half wild rice varieties in seawater yield only about 100 kg per mu. Only high yield and salt tolerant seawater rice with a yield of more than 300 kg per mu can be planted and popularized. Yuan Longping said.
helps to solve the problem of high yield of seawater rice. Yuan Longping is no longer a high-yielding breeding skill for his team.
on the one hand, by 2050, the population of the world will increase by 2 billion 300 million and the grain production must increase by 70%, and the "worry of full belly" can be solved. On the other hand, abiotic stress, such as salt, drought and low temperature, will seriously affect the high yield and stable yield of crops.
it is reported that more than 6% of the land area in the world is damaged by salt and alkali. In the arable land, 19.5% of the paddy fields and 2.1% of the dry land have been affected by salt and alkali. 15% of the paddy fields in China are affected by different degrees of salt damage. With the influence of climate change, sea level promotion, irrationality and irrigating system, and the bottom rock rich in harmful salt, the area of salinized land will continue to expand in the world.
"rice is a salt sensitive crop. After a period of salt stress, it will cause photosynthesis decline, plant growth and even death. Lin Jianzhong, an associate professor at the Hunan University, said. He said that the research on rice salt tolerance mechanism has made great progress, but there are still many problems. For example, how to clarify the complex network model of salt stress signal pathway, the mechanism of rice transporter in salt stress stress response and ion transmembrane transport, and how to use identified salt stress related molecular markers and gene loci to cultivate salt tolerant rice varieties. "Salt tolerance of rice is a comprehensive expression of many physiological traits, controlled by multiple genes. It is imperative to increase the exploitation and utilization of rice salt tolerant germplasm resources, strengthen the study on the location of salt tolerant molecular markers in rice, clone the salt tolerant genes, and study the mechanism of its action.