Search

[Objective] The present paper aimed to explore the combining ability and the correlation of yield and ear characters of twenty new bred maize inbred lines. [Method] NC-Ⅱ mating design was applied in this research, twenty new bred maize inbred lines were crossed with five testers for obtaining 100 crosses. The utilization potential of crosses were evaluated through the analysis of combining ability and ear characters in two different ecological environment in Yunnan province. [Result] The result showed that all the ear characters were showed extremely significant level(P<0.01) at the cross, line, tester and line×tester, in addition to ear length, ear diameter, row ear number and kernel rate, the differences of ear characters between different locations were extremely significant level (P<0.01). The inbred lines with high significant yield general combining ability (GCA) effects were L1,L2,L3,L4,L6, L7 and L17. Among the top ten strong heterotic combinations, T1×L3, T5×L17, T1×L2, T3×L8, T4×L1, T4×L13, T4×L15, T1×L19, T5×L6 and T5×L16 had showed high significant special combining ability (SCA), most of those crosses were Flint×Dent (Semi-dent) or Dent(Semi-dent) ×Flint. Correlation analysis showed that the GCA effects of maize ear characters such as ear length, ear diameter, kernel row number and weight per 100 kernels had significantly positive correlation to the yield GCA, however, row ear number and kernel rate had not significant correlation with the yield GCA, the results showed that ear length, ear diameter, kernel row number and weight per 100 kernels had significant contributions to maize yield improvement. [Conclusion] According to our comprehensive analysis on the combining ability of yield and ear characters of 20 new bred inbred lines, seven lines L1, L2, L3, L4, L6, L7 and L17 showed higher utilization potential in the future maize breeding. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】 This study adopted the synergetic elongation relationship between leaf ages and organs, explored the applicability of leaf age model diagnosis method in order to provide basic parameters for establishing maize leaf model for varieties with different total leaf numbers in Yunnan Province, and to provide theoretical foundation for finding out a technical system to precisely guide maize high yield cultivation practices. 【Method】Two locations with two repeats each were tested in Kunming during 2014 and 2015. Three maize varieties with different total leaf numbers were selected from large extended maize varieties in Yunnan Province, Yunrui 999, Yunrui 88, and Yunrui 10 to conduct the research. Leaves were marked, number of roots in 10 plants were observed and recorded, and internode lengths were measured at each unfolding leaf age. The differentiation situations of silk and ear were investigated by peeling under anatomical lens at each unfolding leaf age. 【Result】The initial leaf age of ear differentiation of maize variety with 18 total leaf numbers was the6 th unfolding leaf, that of 19 total leaf numbers was the 7 th unfolding leaf, and that of 21 total leaf numbers was the 8 th unfolding leaf. Unfolding of the 1 st hairy leaf and elongation of the1 st internode could be taken as the diagnosis indicator of initiation of silk differentiation and precursor of ear differentiation.Ear differentiation situation were all at pistil development stage in all varieties when ear inserted leaf unfolded. The leaf ages of ear differentiation duration were the same in varieties with same total leaf numbers. The internode length of the 7 th and 8 th internodes were the longest, fitting the fact that most of the ears were inserted in these two nodes(the 7 th and 6 th leaves counting from top) in tested varieties. A set of secondary root would inevitably appear when the 1 st hairy leaf was unfolded.【Conclusion】The 1 st hairy leaf unfolding stage was an important diagnosis indicator with comprehensive diagnosis significance. Ear went into spikelet differentiation stage at the ear inserted leaf visible stage(small whorl stage). It was also a key stage for flower formation. The ear inserted leaf unfolding stage(whorl opening stage) was of great diagnosis significance. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)