QTLs for root thickness and root penetration across genetic backgrounds in rice
Locations, numbers and effects of quantitative trait loci (QTLs) for a given trait depend on genetic backgrounds and the environments in which phenotyping is conducted. Few studies address the issue on the consistency of QTLs for drought resistant traits. To test whether there exist consistent QTLs for root thickness and root penetration across genetic backgrounds, we studied three rice populations including one recombinant inbred (CO39/Moroberekan) and two doubled haploid (IR64/Azucena and CT9993/IR62266) populations. Root thickness and root penetration were chosen because they are an important component of drought avoidance mechanism and difficult to be incorporated into conventional plant breeding programs. To make comparison of QTLs consistency across genetic backgrounds possible, following criteria were used: 1) Genotyping was done with a common set of RFLP probes from Cornell University although other types of markers such as AFLPs and SSRs were also used. 2) Phenotyping was conducted under similar environmental conditions in a greenhouse although in different years (1992 for CO39/Moroberekan population; 1995 for IR64/Azucena population; 1997 for CT9993/IR62266 population). Our results indicate that there exist consistent QTLs for root thickness and root penetration across genetic backgrounds. These consistent QTLs would be most useful in the development of marker-assisted selection for drought resistance in rice and most promising candidates for positional cloning (This research is supported by the Rockefeller Foundation's Rice Biotechnology Program). (Texte intégral)
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
s.n.
|
| Subjects: | F30 - Génétique et amélioration des plantes, Oryza, locus, enracinement, résistance à la sécheresse, RFLP, http://aims.fao.org/aos/agrovoc/c_5435, http://aims.fao.org/aos/agrovoc/c_24869, http://aims.fao.org/aos/agrovoc/c_6649, http://aims.fao.org/aos/agrovoc/c_2392, http://aims.fao.org/aos/agrovoc/c_34255, |
| Online Access: | http://agritrop.cirad.fr/512862/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Locations, numbers and effects of quantitative trait loci (QTLs) for a given trait depend on genetic backgrounds and the environments in which phenotyping is conducted. Few studies address the issue on the consistency of QTLs for drought resistant traits. To test whether there exist consistent QTLs for root thickness and root penetration across genetic backgrounds, we studied three rice populations including one recombinant inbred (CO39/Moroberekan) and two doubled haploid (IR64/Azucena and CT9993/IR62266) populations. Root thickness and root penetration were chosen because they are an important component of drought avoidance mechanism and difficult to be incorporated into conventional plant breeding programs. To make comparison of QTLs consistency across genetic backgrounds possible, following criteria were used: 1) Genotyping was done with a common set of RFLP probes from Cornell University although other types of markers such as AFLPs and SSRs were also used. 2) Phenotyping was conducted under similar environmental conditions in a greenhouse although in different years (1992 for CO39/Moroberekan population; 1995 for IR64/Azucena population; 1997 for CT9993/IR62266 population). Our results indicate that there exist consistent QTLs for root thickness and root penetration across genetic backgrounds. These consistent QTLs would be most useful in the development of marker-assisted selection for drought resistance in rice and most promising candidates for positional cloning (This research is supported by the Rockefeller Foundation's Rice Biotechnology Program). (Texte intégral) |
|---|