Back
 AJPS  Vol.5 No.18 , August 2014
Environmental Factors Undermine Genetic Expression of Tiller Dynamics in Wild Rice Oryza nivara and Oryza rufipogon
Abstract: Tillering is a principal trait for the study of branching and production of more number of panicles for increased grain production in many cereal crops. Most of the semi-dwarf high yielding rice cultivars exhibit a remarkable degree of stability with respect to their tillering ability and maintain almost a constant tiller number which is genetically fixed for a particular cultivar. However, tiller production in wild species of rice is largely determined by environmental parameters, which supersede genetic features for expression of complete tillering ability. Two species of wild rice like Oryza nivara and Oryza rufipogon were tested for influence of manipulated growing conditions on tiller dynamics by comparing their growth in natural habitats and cemented pots filled with manure added soil. The results revealed a significant enhancement in the number of tiller production as well as biomass accumulation of each tiller with more grain yield in the cultivated conditions in both the species in comparison to the wild situations. The dryland inhabitant O. nivara became mono-tillering and deep water species O. rufipogon produced as many as five tillers with relatively lesser grain yield in their natural environments compared to their cultivated counterparts. From these observations, it is concluded that expression of genetic potential for tiller production is amenable to fluctuation of environmental factors in the wild species of rice and their capacity for adaption to inclement growth conditions.
Cite this paper: Kariali, E. (2014) Environmental Factors Undermine Genetic Expression of Tiller Dynamics in Wild Rice Oryza nivara and Oryza rufipogon. American Journal of Plant Sciences, 5, 2617-2622. doi: 10.4236/ajps.2014.518276.
References

[1]   Cook, M.G. and Evans, L.T. (1983) Some Physiological Aspects of the Domestication and Improvement of Rice (Oryza spp.). Field Crops Research, 6, 219-238.
http://dx.doi.org/10.1016/0378-4290(83)90062-X

[2]   Mohapatra, P.K., Panda, B.B. and Kariali, E. (2011) Plasticity of Tiller Dynamics in Wild Rice Oryza rufipogon Griff., a Strategy for Resilience in Sub-Optimal Environments. International Journal of Agronomy, 2011, Article ID: 543237.
http://dx.doi.org/10.1155/2011/543237

[3]   Yoshida, S. (1981) Fundamentals of Rice Crop Science. International Rice Research Institute, Philippines.

[4]   Paul, M.J. and Foyer, C.H. (2001) Sink Regulation of Photosynthesis. Journal of Experimental Botany, 52, 1383-1400.
http://dx.doi.org/10.1093/jexbot/52.360.1383

[5]   Li, X., Qian, Q., Fu, Z., Wang, Y., Xiong, G., Zeng, D., Wang, X., Liu, X., Teng, S., Hiroshi, F., Yuan, M., Luo, D., Han, B. and Li, J. (2003). Control of Tillering in Rice. Nature, 422, 618-621.
http://dx.doi.org/10.1038/nature01518

[6]   Chen, F., Jiang, L., Zheng, J., Huang, R., Wang, H., Hong, Z. and Huang, Y. (2014) Identification of Differentially Expressed Proteins and Phosphorylated Proteins in Rice Seedlings in Response to Strigolactone Treatment. PLoS ONE 9, Article ID: e93947.
http://dx.doi.org/10.1371/journal.pone.0093947

[7]   Dreccer, M.F., Chapman, S.C., Rattey, A.R., Neal, J., Song, Y., Christopher, J.T. and Reynolds, M. (2013) Developmental and Growth Controls of Tillering and Water-Soluble Carbohydrate Accumulation in Contrasting Wheat (Triticum aestivum L.) Genotypes: Can We Dissect Them? Journal of Experimental Botany, 64, 143-160.
http://dx.doi.org/10.1093/jxb/ers317

[8]   Xiong, G.S., Hu, X.M., Jiao, Y.Q., Yu, Y.C., Chu, C.C., Li, J.Y., Qian, Q. and Wang, Y.H. (2006) LEAFY HEAD2, Which Encodes a Putative RNA-Binding Protein, Regulates Shoot Development of Rice. Cell Research, 16, 267-276.
http://dx.doi.org/10.1038/sj.cr.7310034

[9]   Miyamoto, N., Goto, Y., Matsui, M., Ukai, Y., Morita, M. and Nemoto, K. (2004) Quantitative Trait Loci for Phyllochron and Tillering in Rice. Theoretical and Applied Genetics, 109, 700-706.
http://dx.doi.org/10.1007/s00122-004-1690-0

[10]   Kariali, E., Kuanar, S. and Mohapatra, P.K. (2008) Individual Tiller Dynamics of Two Wild Oryza Species in Contrasting Habitats. Plant Production Science, 11, 355-360.
http://dx.doi.org/10.1626/pps.11.355

[11]   Kawano, K. and Tanaka, A. (1968) Studies on the Inter-Relationships among Plant Characters in Rice. I. Effect of Varietal Difference and Environmental Condition on the Correlation between Characters. Japanese Journal of Breeding, 18, 75-79.
http://dx.doi.org/10.1270/jsbbs1951.18.75

[12]   Dingkuhn, M. and Kropff, M. (1996) Rice. Photo-Assimilate Distribution in Plants and Crops: Source-Sink Relationships. Zamski, E. and Schaffer, A.A. (Eds.), Marcel Dekker Inc., New York, 519-547.

[13]   Mc Steen, P. and Leyser, O. (2005) Shoot Branching. Annual Review of Plant Biology, 56, 353-374.
http://dx.doi.org/10.1146/annurev.arplant.56.032604.144122

[14]   Kariali, E. and Mohapatra, P.K. (2007) Hormonal Regulation of Tiller Dynamics in Differentially-Tillering Rice Cultivars. Plant Growth Regulation, 53, 215-223.
http://dx.doi.org/10.1007/s10725-007-9221-z

 
 
Top