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Palanivel, S.,Jayabalan, N. The Korean Society of Plant Biotechnology 2000 Plant molecular biology and biotechnology research Vol.2 No.1
An efficient method of shoot regeneration of peanut is described. In vitro shoot organogenesis from the callus of cotyledon explants of Arachis hypogaea L. was stimulated by addition of Adenine sulphate (Ads) along with 6 - benzylaminopurine (BAP) and - napthalene acetic acid (NAA). Ads (13 ${\mu}{\textrm}{m}$) had a stimulatory effect on shoot bud differentiation when combined with BAP (13 ${\mu}{\textrm}{m}$) and NAA (2 ${\mu}{\textrm}{m}$). Shoot organogenesis was markedly higher (92%) from callus induced on Ads, BAP and NAA combined media than from those formed by the individual supplementation of Ads or BAP with NAA. The shoots elongated on the media with GA$_3$ (1 ${\mu}{\textrm}{m}$). Elongated plantlets rooted with MS media containing IBA (9 ${\mu}{\textrm}{m}$).
An Efficient Plant Regeneration System for Sorghum bicolor - a Valuable Major Cereal Crop
Baskaran P.,Jayabalan N. The Korean Society of Plant Biotechnology 2005 Plant molecular biology and biotechnology research Vol.7 No.4
An efficient, rapid and large-scale in vitro clonal propagation of agronomically important Indian cereal crop genotypes (NSH27 & K5) of Sorghum bicolor (L.) Moench. by enhanced shoot proliferation in shoot tip segments was designed. MS medium fortified with plant growth regulators and coconut water markedly influenced in vitro propagation of Sorghum bicolor. In vitro plantlet production system has been investigated on Murashige and Skoog (MS) medium with the synergistic combination of 6-benzyladenine ($22.2\;{\mu}M$), kinetin ($4.6\;{\mu}M$), adenine sulphate ($2.8\;{\mu}M$), 5% coconut water and 3% sucrose which promoted the maximum number of shoots as well as beneficial shoot length. Subculturing of shoot tip segments on a similar medium enabled continuous production of more than 100 healthy shoots with similar frequency. When the healthy shoot clumps were cultured on MS medium fortified with 6-benzyladenine ($22.2\;{\mu}M$), kinetin ($4.6\;{\mu}M$), adenine sulphate ($2.8\;{\mu}M$), ${\alpha}$-naphthaleneacetic acid ($2.7\;{\mu}M$), ascorbic acid ($30.0\;{\mu}M$) and 5% coconut water, a rapid production of axillary and adventitious buds was developed after 8 wk culture. More than 300 shoots were produced 10 wk after culture. Rooting was highest (100%) on half strength MS medium containing 22.8 mM IAA. Micropropagated plants established in garden soil, farmyard soil and sand (2:1:1) were uniform and identical to the donor plant with respect to growth characteristics. These plants grew normally without showing any traits.
Palanivel, S.,Parvathi, S.,Jayabalan, N. 한국식물학회 2002 Journal of Plant Biology Vol.45 No.1
We evaluated the efficiency of callus induction and plantlet regeneration from mature cotyledonary segments of groundnut cultivars VRI-2 and VRI-3. Callus cultures were induced from mature tissues using NAA and IAA in combination with KIN or BAP. Maximum induction was recorded with 3.0㎎/L IAA and 1.0㎎/L BAP. However, green, compact, and nodular calli were obtained in 2.5㎎/L of IAA or NAA combined with 1.0㎎/L of either BAP or KIN. Fresh and dry weights were highly influenced by auxin concentration. Compact and nodular call! were then transferred to shoot induction media. The highest mean number of shoots was observed in 3.0㎎/L BAP plus 0.5㎎/L IAA. Finally, the resulting plantlets were rooted with IBA and NAA.
Venkatachalam, P.,Geetha, N.,Jayabalan, N.,Saravanababu, S. 한국식물학회 1998 Journal of Plant Biology Vol.41 No.4
Cell suspensions derived from immature leaves of the groundnut (Arachis hypogaea L.) were cultured in the presence and absence of Cercosporidium personation pathotoxic culture filtrates. Cell viability and reactions of cell lines were determined after exposure to various concentrations (25-100%, v/v) of the filtrates. Cell lines have been selected for resistance to the toxin(s) produced by C. personatum. Selected cell lines were used for plant regeneration on regeneration media containing C. personatum culture filtrates. Plant regeneration frequency was found to be low in long-term cultures, whereas it was high in short-term cultures. The selfed progeny of the plants regenerated from the resistant cell lines showed resistance to the pathogen in the field. Six out of 82 plants exhibited enhanced resistance in the R_2 generation. The culture filtrate stimulated callus proliferation as well as plant regeneration at lower concentrations, a response that could prove to be very useful for obtaining disease resistant plants through in vitro selection.