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RESPONSE OF SUGAR CORN LINES TO M- AND C- TYPES OF CYTOPLASMIC MALE STERILITY

RESPONSE OF SUGAR CORN LINES TO M- AND C- TYPES OF CYTOPLASMIC MALE STERILITY

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Date posted online

13.06.2017

Institution

SE “Institute of Grain Crops” of NAAS of Ukraine

Bibliography

Section

SOURCES AND DONORS

Abstract

Goal. In  the light of the importance of CMS in the heterosis breeding of sugar corn, the objective of this work was to study the response of this crop lines to M- and S-types of sterility, their differentiation according to sterility and fertility classes, identification of sterility fixers and fertility restores of these types of CMS among them and determination of these lines’ places in the forthcoming crossing scheme (female and male forms).

Results and Discussion. The response of sugar corn lines for M- and C- types of CMC was studied on hybrid generations derived from crossing lines - analyzers of these types of sterility with fertile lines. Assessment of the test crosses revealed patterns of formation of the “panicle sterility and fertility” trait in F1 hybrids. Lines were categorized by its fixing and restoring capacities in percentages of sterile and fertile plants within a particular hybrid genotype under analysis. Lines were systematized by sterility and fertility recovery groups of the estimated types of CMS and by growing season duration. The ways of using lines in sugar corn breeding programs to create high-yielding hybrids on a sterile basis with a high level of fertility restorers, which will meet the current agribusiness requirements, were outlined.

Conclusions. The lines- sterility fixers, partial and complete fertility restorers of these types of CMS were identified. A higher static character of the genetic control for the "sterility-fertility" traits is typical for S-type lines, in comparison with M-type. accessions. Across lines with M-type CMS, 94.2% are early-ripening or mid-early sterility fixers. Most of the lines (61.0%) estimated by their response to S-plasma had a high restoring ability. A considerable number of them (32.2%) belonged to the mid-early group. Lines KTs 420-1, KTs 421-1 and МS 11 are natural universal restorers of fertility. They can provide a high restoring ability in hybrids of both types of CMS.

Keywords

sugar corn, line, response, classification, fixers, restorers, CMS types