不同轮回选择改良轮次玉米群体选系的育种潜势

doi:10.3864/j.issn.0578-1752.2012.18.002

Abstract

Abstract: 【Objective】The objective of the present study is to estimate the breeding potentiality of 18 lines derived from six improved populations, thus to provide a scientific basis for generating strategies of deriving lines from an improved population.【Method】A total of 18 inbred lines derived from 6 maize populations developed by different cycles of recurrent selection were used as experiment materials. The phenotypes of the 18 lines per se were analyzed, and the combing ability of major traits was tested according to an incomplete diallel model, the genetic diversity of the lines was analyzed by SSR markers. 【Result】 The results showed that the inbred lines derived from different populations, and the inbred lines derived from different basic individuals in a same population varied in the phenotype and combing ability. The inbred lines P4MSC2-1, P4MSC2-2, P5MSC2-2 and P5MSC2-3 derived from the improved population were superior in yield, yield component and their general combing ability (GCA), the hybrids between these lines and the testers were high in yield. In summary, most of the inbred lines derived from the improved population were better than the inbred lines derived from the base population in yield, yield component and their GCA. However, the inbred lines derived from the improved population were taller in plant height and ear height. The number and percentage of homozygote of the lines derived from the improved populations were roughly equivalent to that of the lines derived from the basic populations with one inbred generation less. The genetic diversity of the lines derived from the improved population showed a decrease trend, but the genetic diversity was still rich relatively. 【Conclusion】All the results indicated that the inbred lines derived from an improved population were more superior, and when the individuals of the improved populations were inbred to develop lines, it became homozygous faster than the basic populations.

Key words: maize, population, recurrent selection, inbred line, SSR, combing ability

LI Lu-Jiang, CHEN Wen-Sheng, YANG Ke-Cheng, LAN Hai, PAN Guang-Tang, RONG Ting-Zhao. Breeding Potentiality of the Inbred Lines Derived From the Maize Populations Developed by Different Cycles of Recurrent Selection[J].Scientia Agricultura Sinica, 2012, 45(18): 3688-3698.

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Breeding Potentiality of the Inbred Lines Derived From the Maize Populations Developed by Different Cycles of Recurrent Selection

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