Hybridization breeding method of high-phosphorus-efficiency maize

Abstract

The invention discloses a hybridization breeding method of high-phosphorus-efficiency maize. The hybridization breeding method includes the following steps: 1) hybridizing a male parent and a first female parent of maize to obtain hybridized F1-generation seeds; 2) under a screen planting condition, selfing the F1-generation seeds to form a second cycle line population, selecting a specific plant which has screening characters, and continuously selfing the specific plant for 8 generations, and culturing the specific plant to form a selfing line as a second female parent, wherein the screen planting condition comprises three treatment steps to the maize plant: a) sowing the seeds under a low phosphorus condition, b) performing drought treatment from a seven-leaf period to an emulsion period, and c) drought recovery: irrigating a maize planting zone in a milk-ripe period with water containing K20, and then normally irrigating the maize with water; and 3) hybridizing the second female parent with the male parent of the maize to obtain new F1-generation seeds, which are high-phosphorus-efficiency maize seeds. The selfing seeds and the hybridized seeds are high in phosphorus utilization rate, are high in yield and are drought-resistant.

Description

technical field [0001] The invention relates to a hybrid breeding method of phosphorus high-efficiency corn. Background technique [0002] Maize has a large planting area in China and is widely distributed. It is one of the main grains for people in northern and southwestern mountainous areas and other dry valley areas of China. The bumper harvest of corn is a major issue related to food security and social stability. In recent years, due to weather conditions such as drought and the inability to irrigate the corn in time, the yield of corn has been greatly reduced. At the same time, due to the bullish price of phosphate fertilizer in recent years, many farmers apply less or no phosphate fertilizer in corn planting, which also reduces the drought tolerance and yield of corn. Therefore, cultivating high-yielding phosphorus-efficient and drought-tolerant maize varieties is one of the important ways to solve my country's food security, resource and environmental problems in t...

AI Technical Summary

Problems solved by technology

In recent years, due to weather conditions such as drought and the inability to irrigate the corn in time, the yield of corn has been greatly reduced

At the same time, due to the bullish price of phosphate fertilizer in recent years, many farmers apply less or no phosphate fertilizer in corn planting, which also reduces the drought tolerance and yield of corn.