Development of Callus Initiation and Regeneration System of Different Indigenous indica Rice Varieties
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1 Research Paper Development of Callus Initiation and Regeneration System of Different Indigenous indica Rice Varieties Kazi Muhammad Ahasanul Hoque*, Z.A. Azdi and Shamsul H. Prodhan Depart. of Genetic Engineering and Biotechnology, Shahjalal University of Sci. and Tech., Sylhet 3114, Bangladesh * Abstract The aim of the present study was to develop an efficient protocol for best callus induction and complete plant regeneration for varieties of rice (Oryza sativa) i.e. Pakhi Biroin, Hati Baromashi, Kacha Biroin, Badal Boro, Porichok Amon, Khoiya Boro, Joria Aman and BRRI Dhan53. Pakhi Biroin, HatiBaromashi, BadalBoro, Porichok Amon, KhoiyaBoro and Joria Aman cultivate mainly in Sylhet & Sunamgonj district of Bangladesh. For callus induction from mature dehusked rice seeds MS (Murashige & Skoog, 1962) media supplemented with different concentrations i.e. (1.5, 2.0, 2.5, 3.0 mg/l of 2,4- D (2,4 dichlorophenoxyacetic acid)) were used. Khoiya Boro and Joria Aman did not show any efficiency in callus induction. Maximum percentage of callus induction efficiency that is 100% was noted for Pakhi Biroin, Hati Baromashi and BRRI Dhan53, but 75% was the highest percentage of callus for Kacha Biroin. For plantlet regeneration of Pakhi Biroin, Hati Baromashi and Kacha Biroin, MS media with 0.5 mg/l NAA (1-Napthaleneacetic acid), 0.5 mg/l Kinetin and various concentrations of BA (6-benzyladenine) (1.0, 2.0, 3.0, 4.0 mg/l) were employed. On the other hand, MS media with 1.0 mg/l NAA, 1.0 mg/l Kinetin and various concentrations of BA (1.0, 2.0, 3.0, 4.0 mg/l) were used for BRRI Dhan53 regeneration. Different result was recorded for different varieties at various hormone concentrations. Keywords: Mature Embryos, Genotypic Variability, Embryogenic Callus, Plant Regeneration, Indica Rice 1. Introduction Rice (Oryza sativa L) is one of the most versatile and important cereal crops of Poaceae family cultivated for more than 10,000 years (Sasaki, 2001). Currently this crop supports more than 50% of the world population (Christou, 1997). In Asia it covers half of the arable land used for agriculture in many countries (Cantrell & Hettel, 2004). But the rate of growth in rice production has slowed down. A considerable improvement has already been made by exploiting the natural variation through conventional breeding. Recent advancement in biotechn-ology, such as transformation and In situ and In vitro hybridization has enhanced the introgression of new genes from different sources to the cultivated species (Sikder et al, 2006). Efficient plant regeneration from cultured cells and tissues requires successful application of biotechnology in crop improvement. Therefore, the success of cell and tissue culture research depends upon reliable callus cult-ure and plant regeneration procedures. The frequencies of callus induction and plant regeneration in tissue cultu-re of rice are influenced by many factors: culture medi-um composition explants source, genotype and environ-ment (Torbert et al, 1998). Among them the genotype and nutrient composition are regarded to be the major sources of variation in in vitro culture (Khanna & Raina, 1998). Pakhi Biroin, Hati Bromashi, Kacha Biroin, Badal Boro, Porichok Aman, Khoiya Boro and Joria Aman are pure varieties of Oryza sativa cultured mainly in Sylhet and Sunamgonj, district of Bangladesh. BRRI Dhan53 are hybrid rice variety from BRRI. It has moderate salt tolerance. Objective of the present research was to study the Available online at 46
2 potentiality of the varieties in tissue culture as well as to determine the most suitable concentration and combination of growth regulators for excellent callus induction and regeneration which is of great impotence for gene transformation to create high yielding varieties. 2. Material and Method This research work was conducted at the plant genetic engineering lab of Department of Genetic Engineering and Biotechnology, Shahjalal University of Science & Technology (SUST), Sylhet, Bangladesh. Mature Dehusked rice seeds were taken as source of explant. Dehusked seeds were first washed in distilled water mixed with Tween 20 (one drop/30 ml of water) for ten minutes, steeped in 70% (v/v) ethanol for two minutes with gentle agitation followed by rinsing three times with sterile distilled water. The seeds were surface sterilized in 0.1% (w/v) HgCl 2 for 15 minutes with gentle agitation and rinsed five times with sterile distilled water. Surface sterilized seeds were thoroughly washed six to ten times with autoclaved sterile distilled water. The seeds were finally placed on the sterilized petriplate having sterile filter papers with the help of forceps to remove excess water. After removing the water from the seeds surface, these seeds were inoculated into culture tubes containing MS (Murashige & Skoog, 1962) basal media supplemented with different concentrations of 2, 4-dichlorophenoxyacetic acid (2,4-D) culture tubes were transferred and maintained in an environmentally controlled growth room for 4 weeks for callus and subcultured in the same medium for 3 weeks. Regeneration efficacy was observ-ed with MS media supplemented with different combina-tion and concentration of NAA, Kn (Kinetin) and BA. The ph of the media was adjusted to 5-8 with acid and alkali. The media was autoclaved at 15 pound square inch (psi) for 20 minutes at 121 C. Inoculation was carried out under a sterilized environment in a laminar air flow cabinet. All cultures were incubated at 25±1 C with a photoperiod of 12 hours at 2000 lux light intensity of cool white fluorescent light. The response of all varieties of rice was determined in terms of callus induction, callus growth and regeneration frequencies. The data of callus growth was subjected to ANOVA (Analysis of Variance) testing and Standard error (SE) for 5% of means was calculated by using standard statistical MSTAT-C software. 3. Result Results are shows in Figure 1-4 and Tables 1-3. Callus induction of Dehusked rice seeds of eight varieties i.e. Figure 1. Callus Induction A) Pakhi Biroin on MS Medium with 2.5 mg/l 2,4-D B) Hati Bromashi on MS Medium with 2 mg/l 2,4-D C) Kacha Biroin on MS Medium with 2 mg/l 2,4-D D) BRRI dhan53 on MS Medium with 2 mg/l 2,4-D Pakhi Biroin, Hati Bromashi, Kacha Biroin, Badal Boro, Porichok Aman, Khoiya Boro, Joria Aman and BRRI Dhan53, was carried out on MS medium forti-fied with different concentrations of 2,4-D (for landraces varieties 1.5 mg/l, 2 mg/l, 2.5 mg/l, 3 mg/l and for BRRI Dhan53, 1mg/l, 2mg/l and 3mg/l) (Figure 1). Badal Boro, Porichok Amon, Khoiya Boro and Joria Aman did not show any callus after 4 weeks. Calli were developed within 10 days of inoculation of Pakhi Biroin, Hati Bromashi, Kacha Biroin and BRRI Dhan53. Both embry-ogenic and nonembryogenic calli were initiated. After four weeks, large calli were formed from the scutellum. Figure 2. Subculture Callus A) Pakhi Biroin on MS Medium with 2.5 mg/l 2,4-D B) Hati Bromashi on MS Medium with 2 mg/l 2,4-D C) Kacha Biroin on MS Medium with 2 mg/l 2,4-D D) BRRI dhan53 on MS Medium with 2 mg/l 2,4-D The frequency of callus initiation were calculated as Pakhi Biroin 75%, Hati Bromashi 100%, Kacha Biroin 43.75% Available online at 47
3 and BRRI Dhan %. The first subculture was, then, carried out and calli were removed from seed endosperms and transferred onto fresh media (Figure 2). all rice varieties have high embryogenic potential (Ge et al, 2006 and Khaleda & Al-Forkan, 2006) and was excellent material for transformation of rice by Agrobacterium Table 1. Effect of Callus Induction of Pakhi Biroin, Hati Bromashi and Kacha Biroin Varieties on MS Supplemented with Different Concentrations of 2, 4-D Concentration of 2,4-D (mg/l) Varieties Frequency of Callus Initiation (%) Degree of Callus Callus Growth Rate on 1 st Subculture in Size ± SE (mm/week) Pakhi Biroin ±0.11 Hati Bromashi ±0.35 Kacha Biroin 0-0 Pakhi Biroin ±0.23 Hati Bromashi ±0.16 Kacha Biroin ±0.13 Pakhi Biroin ±0.13 Hati Bromashi ±0.62 Kacha Biroin ±0.83 Pakhi Biroin ±0.35 Hati Bromashi ±0.18 Kacha Biroin ±0.14 Size of Callus = (width + length)/2 The response of explants to different concentrations of 2, 4-D in terms of callus induction, degree of callusing including the callus growth rate is shown in Table 1 and Table 2. (Rashid et al, 1996; Toki, 1997; Rashid et al, 2001; 2003; Cho et al, 2004 and Ge et al, 2006). In this study, by offering suitable growth regulators a great number of embryogenic calli from mature seeds of four indica Table 2. Effect of Callus Induction of BRRI dhan53 Variety on MS Supplemented with Different Concentrations of 2,4-D Concentration of 2,4-D (mg/l) Frequency of Callus Initiation (%) Degree of Callus Callus Growth Rate on 1 st Subculture in Size± SE (mm/week) ± ± ± ±0.28 Size of Callus = (width + length)/2 Upon transferring the calli to regeneration media, green spots were visible on the calli within 7-10 (Figure 3) days and after 4-5 weeks fully regenerated roots and shoots were observed (Figure 4). At every treatment, regeneration of roots, shoots, and the frequency were noted as shown in Table Discussion Mature Dehusked rice seeds were used as an explants because calli initiated from scutellum of mature seeds of varieties i.e. Pakhi Biroin, Hati Baromashi, Kacha Biroin and BRRI Dhan53, were successfully induced. MS medium was used as basal media as MS and N6 (Cho s N6 basal media) were the most commonly used basal media (Pandey et al, 1994; Rashid et al, 1996 and Toki, 1997). Mostly 2,4-D has been used as the only growth regulator in callus induction media (Katiyar et al, 1999 and Zhenyu et al, 1999). The present study showed that the MS medium supplemented with 2,4-D alone enables the production of calli from the seeds of Pakhi Available online at 48
4 Biroin, Hati Baromashi, Kacha Biroin & BRRI Dhan53. Similar results were reported by Ge et al (2006) for the varieties of Zhenshan 97, Minghui 63, and These findings are as per the reports of several researchers (Jubair et al, 2008; Summart et al, 2008 and Tariq et al, 2008). We have found that the Hati Bromashi produced 100% callus, BRRI Dhan53 produced 79.16% callus and Pakhi Biroin produced 75% callus. Similar result was also reported by Kabir et al (2008) for BRRI Dhan32 variety. They also reported that BRRI Dhan29 produced 69.45% callus which is relevant to Kacha Biroin variety produced 43.75% callus. Saharan et al (2004) observed callus induction frequency was 60.5% in cv. HKR-46, whereas in HKR-126 it was 83.5 per cent. This finding was also Table 3. Regeneration Frequency of Pakhi Biroin, Hati Bromashi, Kacha Biroin, and BRRI dhan53 Varieties on MS Supplemented with Different Hormonal Combinations and Concentrations Pakhi Biroin, Hati Bromashi and Kacha Biroin Concentration of Growth Regulator (BA+NAA+Kn) (mg/l) Frequency of Varieties Regeneration (%) Pakhi Biroin 0 Hati Bromashi 0 Kacha Biroin 0 Pakhi Biroin 75 Hati Bromashi 50 Kacha Biroin 25 Pakhi Biroin 50 Hati Bromashi 75 Kacha Biroin 75 Pakhi Biroin 25 Hati Bromashi 25 Kacha Biroin 25 BRRI dhan53 Concentration of Growth Regulator (BA+NAA+Kn) (mg/l) Frequency of Regeneration (%) similar with our results. Figure 3. Plantlet Regenerate Initiation A) Pakhi Biroin on MS Medium with 2 mg/l BA mg/l NAA mg/l Kn B) Hati Bromashi on MS Medium with 3 mg/l BA mg/l NAA mg/l Kn C) Kacha Biroin on MS Medium with 3 mg/l BA mg/l NAA + 0.5mg/l Kn D) BRRI dhan53 on MS Medium with 2 mg/l BA + 1 mg/l NAA + 1 mg/l Kn Figure 4. Plantlet Regenerated A) Pakhi Biroin on MS Medium with 2 mg/l BA mg/l NAA mg/l Kn B) Hati Bromashi on MS Medium with 3 mg/l BA mg/l NAA mg/l Kn C) Kacha Biroin on MS Medium with 3 mg/l BA mg/l NAA mg/l Kn D) BRRI dhan53 on MS Medium with 2 mg/l BA + 1 mg/l NAA + 1 mg/l Kn Three varieties i.e. Hati Bromashi, Kacha Biroin, BRRI Available online at 49
5 Dhan53 showed better callus induction response on MS medium supplemented with 2mg/l 2,4-D similar to Pandey et al (1994). They founded that MS medium, supplemented with 2.0 mg/l 2, 4-D, produced the most desired calli for 10 rice genotypes. Other researchers (Islam et al, 2005 and Khalequzzaman et al, 2005) found better callusing frequency at a concentration of 2.5 mg/l 2,4-D. It coincides with our findings as we found that Pakhi Biroin shows better callusing frequency at a concentration of 2.5 mg/l 2,4-D and embryogenic calli obtained from mature seed explant have high regeneration capacity (Khalequzzaman et al, 2005). Combinations of auxin and cytokinin along with the effect of basal salts played an important role for plant regeneration (Prodhan et al, 2001 and Lee et al, 2002). In this study we found Pakhibiroin shows best results at the concentration of NAA 0.5 mg/l + BA 2 mg/l + Kinetin 0.5 mg/l, Hati Baromashi and Kacha Biroin shows best results at NAA 0.5 mg/l + BA 3 mg/l + Kinetin 0.5 mg/l and BRRI Dhan53 shows best regeneration frequency at, MS + NAA 1 mg/l + BA 2 mg/l + Kinetin 3 mg/l which are similar to Jubair et al (2008) study, in which they found best regeneration frequency for local variety Topa at MS + NAA 0.5 mg/l + BA 3 mg/l + Kinetin 0.5 mg/l. 5. Conclusion The investigation was conducted for establishment of callus initiation and regeneration system for these local rice varieties using mature seed embryo as explants. This highly efficient, reproducible system will be used to develop genetic transformation techniques for these important rice cultivars. Acknowledgement The authors gratefully acknowledge to the Plant Genetic Engineering Lab of Depart. Genetic Engineering and Biotechnology, Shahjalal University of Sci. and Tech. who gave all the lab facilities. References Cantrell, R.P., and Hettel, G.P. (2004) New challenges and technological opportunities for rice-based production system for food security and poverty alleviation in Asia and the Pacific. In: FAO Rice Conference, February 12-13, 2004, Rome, Italy. FAO, pp Cho, J.H., Lee, J.Y., and Kim, Y.W. (2004) Improvement of shoot regeneration from scutellum derived callus in rice. Korean J. Crop. Sci., 49, pp Christou, P. (1997) Rice transformation: bombardment. Plant Molecular Biology, 35, pp Ge, X., Chu, Z., Lin, Y., and Wang, S. (2006) A tissue culture system for different germplasms of indica rice. Plant Cell Rep., 25, pp Islam, M., Ahmed, M., and Mahaldar, D. (2005) In vitro callus induction and plant regeneration in seed explants of rice (Oryza sativa L.). Research Journal of Agriculture and Biological Sciences, 1, pp Jubair, T.A., Salma, U., Haque, N., Akter, F., Mukti, I.J., Haque, A.K.M.F., and Ali, M.R. (2008) Callus induction and regeneration of local rice (Oryza sativa L.) variety Topa. Asian Journal of Plant Sciences, 7, pp Kabir, A.H., Mahfuz, I., Razvy, M.A., Ahmed, M.B., and Alam, M.F. (2008) Indirect organogenesis and somaclonal variation in four rice cultivars of Bangladesh. Journal of Applied Sciences Research, 4(4), pp Katiyar, S.K., Chandel, G., Singh, P., and Prathibha, R. (1999) Genetic variation and effect of 2,4-D In vitro plant regeneration in indica rice cultivars. Oryza, 36, pp Khaleda, L., and Al-Forkan, M. (2006) Genotypic variability in callus induction and plant regeneration through somatic embryogenesis of five deepwater rice (Oryza sativa L.) cultivars of Bangladesh. African Journal of Biotechnology, 5(16), pp Khalequzzaman, M., Haq, N., Hoque, M., and Aditya, T. (2005) Regeneration efficiency and genotypic effect of 15 indica type Bangladeshi rice (Oryza sativa L.) Landraces. Plant Tissue Culture & Biotechnology, 15, pp Khanna, H.K., and Raina, S.K. (1998) Genotype x culture media interaction effects on regeneration response of three indica rice cultivars. Plant Cell, Tissue and Organ Culture, 52(3), pp Lee, K., Jeon, H., and Kim, M. (2002) Optimization of a mature embryo-based in vitro culture system for highfrequency somatic embryogenic callus induction and plant regeneration from japonica rice cultivars. Plant Cell, Tissue and Organ Culture, 71(3), pp Murashige, T., and Skoog, F. (1962) A revised medium for rapid growth and bioassay with tobacco tissue culture. Physiol. Plant, 15, pp Pandey, S.K., Ramesh, B., and Gupta, P.K.S. (1994) Callusing and plant regeneration in rice. Indian J. Genet., 54(3), pp Prodhan, S.H., Nagamiya, K., Komamine, A., and Hirai, Y. (2001) Regeneration response of indica and japonica rice in different media. Bangladesh J. Pl. Breed. Genet., Available online at 50
6 14(2), pp Rashid, H., Abbasi, F.M., and Quraishi, A. (2003) Plant regeneration from seed derived callus of three varieties of basmati rice. Plant Tissue Cult., 13, pp Rashid, H., Bokhari, S.Y.A., and Quraishi, A. (2001) Callus induction, regeneration and hygromycin selection of rice (Super Basmati). On Line Journal of Biological Sciences, 1(12), pp Rashid, H., Yokoi, S., and Hinata, K. (1996) Transgenic plant production mediated by Agrobacterium in indica rice. Plant Cell Rep., 15, pp Saharan, V., Yadav, R.C., Yadav, N.R., and Chapagain, B.P. (2004) High frequency plant regeneration from desiccated calli of indica rice (Oryza sativa L.). African Journal of Biotechnology, 3(5), pp Sasaki, T. (2001) Rice genome analysis to understand the rice plant as an assembly of genetic codes. Photosynth. Res., 70, pp Sikder, M.B.H., Sen, P.K., Mamun, A.A., Ali, M.R., and Rahman, S.M. (2006) In Vitro Regeneration of Aromatic Rice (Oryza sativa L.). Int. J. Agri. Biol., 8(6), pp Summart, J., Panichajakul, S., Prathepha, P., and Thanonkeo, P. (2008) Callus Induction and Influence of Culture Condition and Culture Medium on Growth of Thai Aromatic Rice, Khao Dawk Mali 105, Cell Culture. World Applied Sciences Journal, 5(2), pp Tariq, M., Ali, G., Hadi, F., Ahmad, S., Ali, N., and Shah, A.A. (2008) Callus induction and in vitro plant regeneration of rice (Oryza sativa L.) under various conditions. Pak. J. Biol. Sci., 11, pp Toki, S. (1997) Rapid and efficient Agrobacterium-mediated transformation in rice. Plant Molecular Biology Reporter, 15, pp Torbert, H.A., Prior, S.A., Rogers, H.H. and Runion, G.B. (1998) Crop residue decomposition as affected by growth under elevated atmospheric CO2. Soil Science, 163(5), pp Zhenyu, G., Gaozay, H.D., and Hung, D.N. (1999) Some factor influencing callus formation and plant regeneration in indica rice variety. Plant Physiol. Comm., 35, pp Available online at 51
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