TY - EJOU
AU - Chege, Paul
AU - Palágyi, Andrea
AU - Lantos, Csaba
AU - Kiss, Erzsébet
AU - Pauk, János
TI - Improved Culture Media for Embryogenic Callus Generation in Sorghum [Sorghum bicolor (L.) Moench]
T2 - Phyton-International Journal of Experimental Botany
PY - 2020
VL - 89
IS - 1
SN - 1851-5657
AB - Many attempts on optimization of sorghum [Sorghum bicolor (L.)
Moench] tissue culture induction media have been made, but the culture system
remains with some bottlenecks compared to that of other crops. This study aimed
at assessing the suitability of various induction media to produce embryogenic
callus (yellow and friable) with high induction rates and reduced phenolic
exudation. The six culture medium modifications: 3 based on Murashige and
Skoog (MS) medium and one each based on Chu N6, Gamborg B5 and 190-2
media respectively were applied in the culture of mature embryos from 10
sorghum genotypes. Although there was a genotype influence on the attainment
of a yellow callus, friability of the callus was determined to be dependent on the
culture medium and not the genotype. Half strength MS medium with 0.2 mg/l
2,4-D with 2.8 g/l Gelrite® as the gelling agent modified with 1.0 g/l KH2PO4,
1.0 g/l L-proline, 1.0 g/l L-asparagine and 0.16 mg/l CuSO4·5H2O (type E) was
found to be the most effective resulting in about 60% yellow coloured callus
induction with 25% friability. Addition of CuSO4·5H2O, KH2PO4, L-proline and
L-asparagine significantly reduced the phenolic production. Half strength MS
medium was observed to contribute to quality callus production when compared
to full strength MS media modified with the compounds. The half strength MS
medium was also observed to suppress phenolic production. Medium 190-2
produced the highest regeneration frequency (40%) among the 3-regeneration
media tested. The results provide information on a suitable sorghum callus
induction medium necessary for embryogenesis.
KW - Sorghum; medium; embryogenic; callus; half-strength MS
DO - 10.32604/phyton.2020.07554