Field selection method for indica hybrid rice ideal strain type at the middle and lower reaches of Changjiang River

Abstract

The invention discloses a field selection method for ideal plant types of New Indic Rice in the rice areas of the middle and lower reaches of the Yangtze River. According to the ecological characteristics of the growing seasons of the rice in the middle and lower reaches of the Yangtze River, a selection mode and a field selection index are provided for the plant types of one-season Indic rice grains during the yellow maturity period. The key point of the invention is that a selection with three-high: high growing quantity, high storage quantity and high filling degree is established; according to the three-high mode, quantitative selection indexes for the individual and group plants are established. The individual selection indexes are shown as follows: big, erecting, sparse, solid, excellence and resistance; the selection indexes for the group plants are presented as follows; enough, strong, penetration, elegant and standing. When the single plant is selected, the comprehensive property is investigated; meanwhile, the behavior of individual plant in the group is also investigated; when the group plant is selected, the group structure is investigated and the single plant property is investigated at the same time. Individual plants are selected out of excellent group plants and the group plant is established by excellent individual plants; the process is repeatedly promoted to all seed raising generations, thus improving the selection effect. The improvement of single property is developed to the establishment of the comprehensive property; the qualitative analysis of configuration is developed as quantitative selection of the plant factors; the pure configuration design is developed as the improvement of comprehensive function, thus establishing the frame for the comprehensive selection of the ideal plant type of the New Indic Rice.

Description

technical field [0001] The invention relates to a rice breeding method, in particular to an indica rice breeding selection method in the middle and lower reaches of the Yangtze River. Background technique [0002] Since Australian scholar C.M.Donald proposed the concept of crop ideal plant type in 1968, breeders at home and abroad have conducted research around this important topic and proposed a variety of ideal plant type models. [0003] Khush of the International Rice Research Institute proposed the "less tiller, large spike" model, the main features are: few tillers (4-6), large spikes, high spike rate, less dark green leaves, well-developed root system, etc. [0004] Huang Yaoxiang of Guangdong Academy of Agricultural Sciences proposed the "clustered early growth" model, focusing on the study of plant type in the early stage of rice growth, early growth and fast growth, and the accumulation of material foundation for later growth. The designed plant type model is 105-1...

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