Bls1 - Revision history

Julia: /* Function */

2014-05-24T07:17:34Z

‎Function

Julia: /* Annotated Information */

2014-05-24T07:16:29Z

‎Annotated Information

Julia: /* Location */

2014-05-24T07:16:13Z

‎Location

Julia: /* Location */

2014-05-24T07:15:35Z

‎Location

Julia: /* Location */

2014-05-24T07:14:30Z

‎Location

Julia: /* Location */

2014-05-24T07:12:28Z

‎Location

Julia: /* Annotated Information */

2014-05-24T07:07:03Z

‎Annotated Information

Julia: /* Function */

2014-05-24T06:58:46Z

‎Function

Julia: Created page with "==Annotated Information== The rice bacterial leaf streak (BLS)which has seriously constrained the rice production in humid tropical and subtropical areas of Asia and Africa.Wh..."

2014-05-24T06:46:45Z

Created page with "==Annotated Information== The rice bacterial leaf streak (BLS)which has seriously constrained the rice production in humid tropical and subtropical areas of Asia and Africa.Wh..."

New page

==Annotated Information==
The rice bacterial leaf streak (BLS)which has seriously constrained the rice production in humid tropical and subtropical areas of Asia and Africa.When rice is infected by the BLS pathogen, leaves become yellow or even blasted, the rate of unfilled grains will increase, and the grain weight will decrease. In recent years, some QTLs for BLS resistance have been mapped on rice genome using molecular markers.
===Function===
'''''bls1''''', a BLS-resistance gene, from a rice line DP3, derived from the wild rice species Oryza rufipogon Griff <ref name="ref1" />.
The quantitative trait locus (QTL) '''''qBlsr5a''''' has been proved to have the largest effect on the resistance to rice bacterial leaf streak <ref name="ref2" />.
Li et al. 2008 have analyzed total proteins of leaves of rice cultivar 9311 which had been inoculated by ‘89773-1-1’, a kind of Xooc with strong pathogenicity, in order to find out some proteins associated with the resistance to this pathogen <ref name="ref3" />.They found that these proteins are involved in many resistant reactions associated with signal recognition and transduction, cell-wall reinforcement and biosynthesis of phytoalexins, etc<ref name="ref3" />.

===Expression===
According to the research, the BLS resistance in DP3 was controlled by recessive gene(s). To further confirm the inheritance pattern of BLS resistance, BC2F2 (9311/DP3//9311) populations were evaluated by JZ-8 strain inoculation. The damage severity scores of 307 individuals in BC2F2 population ranged from 0 to 9, and showed a pattern of bimodal distribution (Fig. 2). The segregation of resistant and susceptible plants well fitted in 1:3 ratio , suggested that a recessive gene, tentatively designated as bls1, conferred BLS resistance in DP3 <ref name="ref1" />.

===Evolution===
The common wild rice (''O. rufipogon Griff''.) is considered as wild ancestor of cultivated rice. The wild rice species with AA genome has been well recognized as a primary gene pool that conserves a lot of specific genes such as genes resistance to grassy stunt virus from annual wild rice <ref name="ref1" />.
It is believed that the frequency of resistance genes in wild rice is 50 times higher than that in cultivated rice because it has undergone a long history of natural selection and contained rich genetic diversity <ref name="ref1" /><ref name="ref4" />.

===Location===
The linkage map of the bls1 gene was made in a compact region on chromosome 6. The most closely linked markers flanking the bls1 gene were RM587 and RM510 with genetic distances of 2.9 and 1.1 cM<ref name="ref1" />.
The BLS resistance gene, bls1, was mapped and confirmed in a narrow region flanked by RM587 and RM510 on chromosome 6 (Fig. 3). Therefore, these two closely linked markers, RM587 and RM510 may be used for marker assisted selection (MAS) of BLS resistant lines in rice breeding.(1)
By genotyping these homozygous individuals with SSR markers and performing linkage analysis, qBlsr5a was mapped to an interval between SSR markers RM153 and RM159, which covered a range of 2.4 cM or 290 kb<ref name="ref2" /> .

==achievements on this gene==
* Earlier studies on the inheritance of resistance to BLS in other cases also suggested some types of resistance to BLS are controlled by major genes (Zhang ''et al''. 1996; Xu ''et al''. 1997; Zhou ''et al''. 1999; Zhao ''et al''.2004).
* The BLS resistance in rice has been proved to be a quantitative trait controlled by polygenes. (Zhang ''et al''. 1992; Khush 1977; Gnanamanickam ''et al''. 1999; Tang ''et al''. 2000)
* Some major BLS resistance genes have also been identified (He ''et al''. 1996; Zhang ''et al''. 1996; Xu ''et al''. 1997; Zhou ''et al''. 1999).
* 3 QTLs have been identified which confered the BLS resistance in rice. (Tang ''et al''. 2000)
* In China, Peng ''et al''. (1982) found that the wild rice has high resistance to BLS.
* Xu ''et al''. (1991) screened 2 017 rice accessions, which were derived from the generations of wild rice species, and identified 30 accessions highly resistant to BLS. Huang ''et al''.(2008) also identified 57 resistant accessions from 1655 accessions of wild rice resources.

==References==
<references>
* <ref name="ref1">
HE Wen-ai. Identification of a Resistance Gene bls1 to Bacterial Leaf Streak in Wild Rice Oryza rufipogon Griff. Journal of Integrative Agriculture, 2012, 11(6): 962-969.
</ref>
* <ref name="ref2">
HAN Qing-Dian. Fine Mapping of qBlsr5a, a QTL Controlling Resistance to Bacterial Leaf Streak in Rice.Acta Agron Sin, 2008, 34(4): 587–590.
</ref>
* <ref name="ref3">
Dongxiao Li, Qian Mao, Xiaoling Guo, Liang Chen. Proteomic analysis of differentially expressed proteins fromrice leaves in response to bacterial leaf streak.Journal of Biotechnology. 2008, 136s, S620–S632.
</ref>
* <ref name="ref4">
Vaughan D A. 1994. The wild relatives of rice. In: A Genetic Resources Handbook. IRRI, Los Banos, Phillipines. pp.13-14.
</ref>
</references>

@@ Line 1: / Line 1: @@
 ==Annotated Information==
 [[File:Figure1--bls1.jpg|right|thumb|450px|'''Figure 1.''' ''(from reference) <ref name="ref1" />.'']]
-[[File:Figure2--bls1.jpg|right|thumb|450px|'''Figure 1.''' ''(from reference) <ref name="ref1" />.'']]
+[[File:Figure2--bls1.jpg|right|thumb|450px|'''Figure 2.''' ''(from reference) <ref name="ref1" />.'']]
 The rice bacterial leaf streak (BLS)which has seriously constrained the rice production in humid tropical and subtropical areas of Asia and Africa.When rice is infected by the BLS pathogen, leaves become yellow or even blasted, the rate of unfilled grains will increase, and the grain weight will decrease. In recent years, some QTLs for BLS resistance have been mapped on rice genome using molecular markers.
 ===Function===

@@ Line 21: / Line 21: @@
 The BLS resistance gene, bls1, was mapped and confirmed in a narrow region flanked by RM587 and RM510 on chromosome 6 (Fig. 3). Therefore, these two closely linked markers, RM587 and RM510 may be used for marker assisted selection (MAS) of BLS resistant lines in rice breeding.(1)
 By genotyping these homozygous individuals with SSR markers and performing linkage analysis, qBlsr5a was mapped to an interval between SSR markers RM153 and RM159, which covered a range of 2.4 cM or 290 kb<ref name="ref2" /> .
-[[File:Figure3--bls1.jpg|left|thumb|400px|'''Figure 1.''' ''(from reference) <ref name="ref1" />.'']]
+[[File:Figure3--bls1.png|left|thumb|400px|'''Figure 1.''' ''(from reference) <ref name="ref1" />.'']]
-[[File:Figure4--bls1.jpg|left|thumb|400px|'''Figure 1.''' ''(from reference) <ref name="ref2" />.'']]
+[[File:Figure4--bls1.png|left|thumb|400px|'''Figure 1.''' ''(from reference) <ref name="ref2" />.'']]
 ==achievements on this gene==

@@ Line 7: / Line 7: @@
 The quantitative trait locus (QTL) '''''qBlsr5a''''' has been proved to have the largest effect on the resistance to rice bacterial leaf streak <ref name="ref2" />.
 Li et al. 2008 have analyzed total proteins of leaves of rice cultivar 9311 which had been inoculated by ‘89773-1-1’, a kind of Xooc with strong pathogenicity, in order to find out some proteins associated with the resistance to this pathogen <ref name="ref3" />.They found that these proteins are involved in many resistant reactions associated with signal recognition and transduction, cell-wall reinforcement and biosynthesis of phytoalexins, etc<ref name="ref3" />.
 ===Expression===