NDLI: A bentazon and sulfonylurea sensitive mutant: breeding, genetics and potential application in seed production of hybrid rice

Content Provider	Springer Nature Link
Author	Zhang, J. Xu, Y. Wu, X. Zhu, L.
Copyright Year	2002
Abstract	The use of a thermosensitive genic male sterility (TGMS) system in two-line hybrid rice breeding is affected greatly by the sterility instability of TGMS lines caused by temperature fluctuation beyond their critical temperatures for fertility reversion. To prevent seed production from self contamination, we have developed a system to secure seed purity using a herbicide-sensitive TGMS mutant, M8077S, obtained by radiation. Genetic analysis, using the F1, F2 and F3 populations derived from this mutant and other normal varieties, revealed that bentazon lethality/sensitivity was controlled by a single recessive gene, which was named bel. The mutant can be killed at the seedling stage by bentazon at 300 mg/l or higher, a dosage that is safe for its F1 hybrids and all other normal varieties. This mutant is also sensitive to all the tested sulfonylurea herbicides. Response of segregating plants to these two types of herbicide indicated that sulfonylurea sensitivity was also controlled by bel. By crossing this mutant with Pei-Ai 64S, an F2 population was developed for genetic mapping. Surveying the two DNA pools from sensitive and non-sensitive F2 plants identified four markers that were polymorphic between the pools. The putative linked markers were then confirmed with the F2 population. The bel locus was located on chromosome 3, 7.1 cM from the closest microsatellite marker RM168. Phenotypic analysis indicated that the bel gene had no negative effect on agronomic traits in either a homozygous or heterozygous status. The mutant M8077S is valuable in the development of a TGMS breeding system for preventing impurity resulting from temperature fluctuation of the TGMS. Several two-line hybrid rice crosses using this system are under development.
Starting Page	16
Ending Page	22
Page Count	7
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	105
Issue Number	1
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-05-31
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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