A population of recombinant inbred lines (RILs, F2:9), derived from a cross between IR26 (Oryza sativa subsp. indica) and Jiucaiqing (Oryza sativa subsp. japonica), was used to identify seed germination ability of rice under 100 mmol/L NaCl for 10 days. Six germination traits including imbibition rate, germination rate, germination index, root length, shoot length and vigor index were investigated. A mixed major gene and polygene inheritance model was applied to conduct genetic analysis for germination ability. Significant differences were detected in all the germination traits under salt stress among RILs in rice, and the early germination stage (0–5 days) might be the salt sensitive stage. The frequency distributions of the germination traits under salt stress in the RIL population showed continuous segregation, suggesting that they were quantitative traits controlled by several genes. The germination traits under salt stress were regulated by two or three major genes plus polygene, and mainly dominated by major genes with high heritability values, accounting for 12.5%–99.0% of the total phenotypic variation. Each trait was controlled by the specific genetic model: imbibition rate was controlled by two major genes, germination index and vigor index by two major genes plus polygene, germination rate and shoot length by three major genes plus polygene, and root length by two major genes or two major genes plus polygene.
WANG Zhou-fei, WANG Jian-fei, BAO Yong-mei, WU Yun-yu, SU Xuan, ZHANG Hong-sheng
. Inheritance of Rice Seed Germination Ability under Salt Stress[J]. Rice Science, 2010
, 17(2)
: 105
-110
.
DOI: 10.1016/S1672-6308(08)60112-2
1 Prasad S R, Bagali P G, Hittalmani S, Shashidhar H E. Molecular mapping of quantitative trait loci associated with seedling tolerance to salt stress in rice (Oryza sativa L.). Curr Sci, 2000, 78: 162–164.
2 Gregorio G B, Senadhira D. Genetic analysis of salinity tolerance in rice. Theor Appl Genet, 1993, 86(2): 333–338.
3 Yang Q L, Wang J F, Ding J J, Zhang H S. Inheritance of salt tolerance in some rice (Oryza sativa L.) cultivars at the seedling stage. J Nanjing Agric Univ, 2004, 27(4): 6–10. (in Chinese with English abstract)
4 Yao M Z, Wang J F, Chen H Y, Yang Q L, Zhou G A, Zhang H S. Genetic analysis of salt tolerance in japonica rice landrace Jiucaiqing from Taihu lake region in China. Chin J Rice Sci, 2004, 18(6): 503–506. (in Chinese with English abstract)
5 Johnson D W, Smith S E, Dobrenz A K. Genetic and phenotypic relationships in response to NaCl at different developmental stages in alfalfa. Theor Appl Genet, 1992, 83(6): 833–838.
6 Gai J Y, Wang J K. Identification and estimation of a QTL model and its effects. Theor Appl Genet, 1998, 97(7): 1162– 1168.
7 Gai J Y, Wang Y J, Wu X L, Chen S. A comparative study on segregation analysis and QTL mapping of quantitative traits in plants: with a case in soybean. Front Agric China, 2007, 1(1): 1–7.
8 Zhang Y M, Gai J Y. Methodologies for segregation analysis and QTL mapping in plants. Genetica, 2009, 136: 311–318.
9 Li Y S, Wang Z F, Tang H J, Zhang H S. Genetic analysis of some traits related to yield in japonica rice landrace from Taihu lake region. Chin J Rice Sci, 2006, 20(3): 272–276. (in Chinese with English abstract)
10 Li Y S, Zhu Z, Zhang Y D, Zhao L, Wang C L. Genetic analysis of rice false smut resistance using major gene plus polygene mixed genetic model. Acta Agron Sin, 2008, 34(10): 1728– 1733. (in Chinese with English abstract)
11 Jiang L, Liu S, Hou M, Tang J, Chen L, Zhai H, Wan J. Analysis of QTLs for seed low temperature germinability and anoxia germinability in rice (Oryza sativa L.). Field Crop Res, 2006, 98(1): 68–75.
12 Cao D D, Jin H, Huang X X, Wang X J, Guan Y J, Wang Z F. Relationships between changes of kernel nutritive components and seed vigor during development stages of F1 seeds of sh2 sweet corn. J Zhejiang Univ Sci B, 2008, 9(12): 964–968.
13 Wang Z F, Hu J, Wang S H, Hu W M. Changes of kernel size, sugar accumulation and enzyme activity in the kernel of sh-2 sweet corn and their correlation analysis during milk maturation. J Biomath, 2006, 21(2): 313–319. (in Chinese with English abstract)
14 Chern C S, Sung F J. Prevention of injury during imbibition in Shrunken-2 maize seeds by osmotic control of water uptake. Seed Sci Techn, 1991, 19(2): 469–476.
15 Foolad M R, Stoltz T, Dervinis C, Rodriguez R L, Jones R A. Mapping QTLs conferring salt tolerance during germination in tomato by selective genotyping. Mol Breeding, 1997, 3(4): 269–277.Wang J F, Chen H Y, Yang Q L, Yao M Z, Zhou G A, Zhang H S. Effects of salt concentration and temperature on the screening of salt-tolerance in rice. Chin J Rice Sci, 2004, 18(5): 449– 454. (in Chinese with English abstract)
