Salt Tolerance Evaluation Method of Rice Varieties

Abstract

The invention relates to a rice-variety salt-tolerance evaluating method and belongs to the technical field of plant breeding. The invention provides an identifying and evaluating method for a rice-variety salt-tolerance system, i.e., the salt tolerance of rice varieties is comprehensively evaluated under the same salt concentration and different salt concentrations at three salt sensitive periods, i.e. the budding and seedling period, the tillering stage and the booting stage of rice respectively at a laboratory, a manually-simulated salt pond and a saline soil field by adopting a total biomass-measuring method according to salt-tolerance indexes (the total biomass dry-weight specific-value percent of the rice varieties in a saline environment and a saltless environment). Compared with laboratory assessment in the prior art, the rice-variety salt-tolerance evaluating method has stronger practical effects and can be more directly applied to the planting of the rice varieties.

Description

technical field [0001] The invention relates to the technical field of plant breeding, in particular to a method for evaluating the salt tolerance of rice varieties. Background technique [0002] The world's saline-alkali land area accounts for about 1 / 3 of the land area, accounting for 20% of the world's total cultivated land area. The area of ​​saline-alkali land in China is about 20 million hm2. Due to the impact of many factors such as human activities, soil salinization is constantly devouring the land on which human beings live, and the area of ​​land available for cultivation is decreasing day by day. Rice is the second largest food crop in the world, with an annual planting area of ​​about 2 billion mu, and about one-third of the world's people use rice as a staple food. In my country, rice is the largest grain crop. The annual planting area in my country is about 500 million, which is 1 / 3 of the national grain planting area, and rice production accounts for 44% of...

AI Technical Summary

Problems solved by technology

[0004] At present, the evaluation of salt tolerance of rice varieties is mostly limited to the germination stage of rice in the laboratory environment, and it is not possible to evaluate the salt tolerance of rice during the whole growth period of rice, especially the salt-sensitive period, due to the laboratory environment and saline-alkali land. There is a big gap in the field environment, resulting in the results of laboratory identification and field planting results are often very inconsistent, lacking systematization and effectiveness