Fine mapping of pss1, a pollen semi-sterile gene in rice (Oryza sativa L.).
During routine seed increase procedures in rice, semi-sterile plants are common; however, such semi-sterility mutants in rice varieties have been only rarely analyzed genetically. W207-2 is a semi-sterile selection from the japonica rice variety Nipponbare. In this report, we found the female gamete of W207-2 was normal, and its semi-sterility was unaffected by growth duration but was conditioned by a recessive nuclear gene whose action leads to pollen semi-sterility and anther indehiscence, and the gene was named as pss1 (pollen semi-sterile). Using an F(2) population derived from the two parents W207-2 and Dular and a pooled DNA strategy, pss1 was mapped to an interval on chromosome 8 defined by the two SSR loci RM6356 and RS41. The position of pss1 was confirmed in another F(2) population derived from the cross W207-2 x Nipponbare. Over 2,000 homozygous pss1 segregants from the large W207-2 x Dular F(2) population were used to fine map pss1 to a 0.04 cM segment flanked by a CAPs marker L2 and a dCAPs L3 marker. Sequences for both markers are present on a single PAC clone, and the physical distance between them is about 28 kb. Analysis of the PAC sequence predicts the presence of five open reading frames, they are as follows: putative ribonuclease PH, putative avr9 elicitor response protein, kinesin1-like protein, putative protein RNP-D precursor and putative 40S ribosomal protein S13. This result would be helpful in cloning the pss1 gene.
Li
Wanchang
W
State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China.
Jiang
Ling
L
Zhou
Shirong
S
Wang
Chunming
C
Liu
Linglong
L
Chen
Liangming
L
Ikehashi
Hiroshi
H
Wan
Jianmin
J
D001483:Base Sequence; D002874:Chromosome Mapping; D017931:DNA Primers / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D017343:Genes, Plant; D009154:Mutation; D012275:Oryza / Q000235:genetics*; D011058:Pollen / Q000235:genetics; D012098:Reproduction / Q000235:genetics
D017931:DNA Primers; D018744:DNA, Plant