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Effects of D-genome chromosomes on crossability of hexaploid triticale (X Triticosecale Wittmack) with maize

By: Inagaki, M.N.
Contributor(s): Lukaszewski, A.J [coaut.] | Mergoum, M [coaut.] | Mujeeb-Kazi, A [coaut.] | Pfeiffer, W.H.
Material type: materialTypeLabelArticlePublisher: 1997ISSN: 1439-0523 (Revista en electrónico).Subject(s): Embryo culture | Genetic inheritance | Hexaploidy AGROVOC | Maize | Research projects | Triticales | CIMMYT | Zea mays AGROVOC | Plant breeding AGROVOC In: Plant Breeding v. 116, no. 4, p. 387-389649193Summary: With the aim of producing polyhaploids of hexaploid triticale, 20 genotypes from a CIMMYT breeding programme and eight D-genome chromosome substitution lines of 'Rhino' were crossed with maize. In crosses between 20 triticale genotypes and maize, 15 lines produced embryos. Frequencies of embryo formation ranged from 0.0 to 5.4%, with an average of 1.1%. From a total of 200 pollinated spikes, 62 plants were regenerated. Most regenerated plants were polyhaploids with 21 chromosomes, and few aneuhaploids with 22 chromosomes were found. In crosses of triticale substitution lines with maize, all the lines produced embryos, while 'Rhino' produced no embryos at all. Higher frequencies of embryo formation were obtained in substitution lines with chromosomes 2D and 4D. These results suggest that D-genome chromosomes in a triticale genetic background have the effect of increasing the frequency of polyhaploid production in triticale x maize crosses.Collection: CIMMYT Staff Publications Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-2595 (Browse shelf) 1 Available 649193
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0179-9541

With the aim of producing polyhaploids of hexaploid triticale, 20 genotypes from a CIMMYT breeding programme and eight D-genome chromosome substitution lines of 'Rhino' were crossed with maize. In crosses between 20 triticale genotypes and maize, 15 lines produced embryos. Frequencies of embryo formation ranged from 0.0 to 5.4%, with an average of 1.1%. From a total of 200 pollinated spikes, 62 plants were regenerated. Most regenerated plants were polyhaploids with 21 chromosomes, and few aneuhaploids with 22 chromosomes were found. In crosses of triticale substitution lines with maize, all the lines produced embryos, while 'Rhino' produced no embryos at all. Higher frequencies of embryo formation were obtained in substitution lines with chromosomes 2D and 4D. These results suggest that D-genome chromosomes in a triticale genetic background have the effect of increasing the frequency of polyhaploid production in triticale x maize crosses.

English

9801|John Wiley|R97-98ANALY|EE|Maria|anterior|Fdo|FINAL9798|3

CIMMYT Staff Publications Collection

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