Development of Fermentation Process for PLA-degrading Enzyme Production by a New Thermophilic Actinomadura sp. T16-1

Sukhumaporn Sukkhum,Shinji Tokuyama,Vichien Kitpreechavanich 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.3

The fermentation process for a poly (L-lactide) (PLA)-degrading enzyme production by a newly isolate of thermophilic PLAdegrading Actinomadura sp. T16-1 was investigated. The strain produced 33.9 U/mL of enzyme activity after cultivation at 50°C under shaking of 150 rpm for 96 h in a medium consisting of (w/v) 0.05% PLA film, 0.2% gelatin, 0.4% (NH4)2SO4, 0.4% K2HPO4, 0.2 % KH2PO4, and 0.02% MgSO4 ⋅ 7H2O. The optimal concentration of PLA film and gelatin obtained by response surface methodology (RSM) for the highest production of PLA-degrading enzyme was 0.035% (w/v) and 0.238% (w/v), respectively. Under these conditions, the model predicted 40.4 U/mL of PLA-degrading activity and the verification of the optimization showed 44.6 U/mL of PLA-degrading enzymatic activity in the flasks experiment. The maximum PLAdegrading activity reached 150 U/mL within 72 h cultivation in the 3-L airlift fermenter The fermentation process for a poly (L-lactide) (PLA)-degrading enzyme production by a newly isolate of thermophilic PLAdegrading Actinomadura sp. T16-1 was investigated. The strain produced 33.9 U/mL of enzyme activity after cultivation at 50°C under shaking of 150 rpm for 96 h in a medium consisting of (w/v) 0.05% PLA film, 0.2% gelatin, 0.4% (NH4)2SO4, 0.4% K2HPO4, 0.2 % KH2PO4, and 0.02% MgSO4 ⋅ 7H2O. The optimal concentration of PLA film and gelatin obtained by response surface methodology (RSM) for the highest production of PLA-degrading enzyme was 0.035% (w/v) and 0.238% (w/v), respectively. Under these conditions, the model predicted 40.4 U/mL of PLA-degrading activity and the verification of the optimization showed 44.6 U/mL of PLA-degrading enzymatic activity in the flasks experiment. The maximum PLAdegrading activity reached 150 U/mL within 72 h cultivation in the 3-L airlift fermenter

The Role of the OsCam1-1 Salt Stress Sensor in ABA Accumulation and Salt Tolerance in Rice

Sukhumaporn Saeng-ngam,Warintra Takpirom,Teerapong Buaboocha,Supachitra Chadchawan 한국식물학회 2012 Journal of Plant Biology Vol.55 No.3

Involvement of the salt-inducible calmodulin gene,OsCam1-1, in abscisic acid (ABA) biosynthesis during salt stress was studied in the ‘Khoa Dawk Mali 105’ (KDML105)rice cultivar (Oryza sativa L.). FL530-IL, an isogenic saltresistant line derived from the KDML105 cultivar, accumulated a 2.9-fold higher concentration of ABA in the leaves after salt stress treatment than that for KDML105. A twenty-four and a seven- fold higher level of OsCam1-1 transcripts were detected in the leaves of the FL530-IL and KDML105 rice cultivars, respectively, after 30 min of salt stress compared to non-salt-stressed plants. Transgenic rice lines that constitutively over-express the OsCam1-1 gene were found to up-regulate ABA aldehyde oxidase and 9-cis-epoxycarotenoid dioxygenase 3, two genes involved in ABA biosynthesis, and to have a higher ABA content, when compared to the wild type and the control transgenic lines without OsCam1-1 over-expression. In addition, transgenic plants over-expressing OsCam1-1 were more tolerant to salt stress, with, for example, a better ability to maintain their shoot and root mass (as dry weight) during salt stress, than the control plants. These data indicate that OsCam1-1 signaling is likely to play an important role in ABA biosynthesis, and the level of OsCam1-1 gene expression and ABA accumulation probably contribute to salt resistance in rice.

Inheritance of Agronomic Traits and Their Interrelationship in Mungbean(Vigna radiata(L.) Wilczek)

Sriphadet, Sukhumaporn,Lambrides, Christopher J.,Srinives, Peerasak The Korean Society of Crop Science 2007 Journal of crop science and biotechnology Vol.10 No.4

A study was conducted to observe the variation and inheritance of agronomic traits and their interrelationship in mungbean. The objective of the study was to compare agronomic traits and hardseed percentage of 268 recombinant inbred lines(RILs) developed from the cross between wild Vigna subspecies sublobata "ACC 41" with the mungbean cultivar "Berken". The RIL population and their parents were evaluated under controlled conditions in a glass house at the University of Queensland, Brisbane, Australia. The results showed significant differences among the RILs and among the parents in all traits under study. Berken had a longer flowering date and a higher seed weight per plant, but less total leaf number and pod number per plant than ACC 41. A germination test between papers revealed that ACC 41 was 100% hard-seeded and did not germinate at all, while Berken germinated up to 100%. Their RILs distributed well between 0 to 100% hardseed. Upon scarification, all hardseed germinated within seven days. Narrowsense heritability estimates of total leave number, hardseedness, pod length, and pod width were highly heritable at 89.9, 98.9, 93.7, and 93.2%, respectively. The heritability of seed weight per plant and number of seeds per plant were lower at 63.1 and 58.4%, respectively. Seed weight per plant showed positive transgressive segregation when compared with ACC 41 and a positive correlation with 100 seed weight. While the number of seeds per pod showed a negative transgressive segregation when compared with Berken and a negative correlation with pod length and pod width. The RILs gave a 1:1 segregation ratio in leaflet shape, growth habit, and growth pattern, indicating that these traits were controlled by a single dominant gene.

Poly(L-Lactide)-Degrading Enzyme Production by Actinomadura keratinilytica T16-1 in 3 L Airlift Bioreactor and Its Degradation Ability for Biological Recycle

( Sukkhum ),( Sukhumaporn ),( Shinji Tokuyama ),( Vichien Kitpreechavanich ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.1

The optimal physical factors affecting enzyme production in an airlift fermenter have not been studied so far. Therefore, the physical parameters such as aeration rate, pH, and temperature affecting PLA-degrading enzyme production by Actinomadura keratinilytica strain T16-1 in a 3 l airlift fermenter were investigated. The response surface methodology (RSM) was used to optimize PLAdegrading enzyme production by implementing the central composite design. The optimal conditions for higher production of PLA-degrading enzyme were aeration rate of 0.43 vvm, pH of 6.85, and temperature at 46oC. Under these conditions, the model predicted a PLA-degrading activity of 254 U/ml. Verification of the optimization showed that PLA-degrading enzyme production of 257 U/ml was observed after 3 days cultivation under the optimal conditions in a 3 l airlift fermenter. The production under the optimized condition in the airlift fermenter was higher than un-optimized condition by 1.7 folds and 12 folds with un-optimized medium or condition in shake flasks. This is the first report on the optimization of environmental conditions for improvement of PLA-degrading enzyme production in a 3 l airlift fermenter by using a statistical analysis method. Moreover, the crude PLA-degrading enzyme could be adsorbed to the substrate and degraded PLA powder to produce lactic acid as degradation products. Therefore, this incident indicates that PLAdegrading enzyme produced by Actinomadura keratinilytica NBRC 104111 strain T16-1 has a potential to degrade PLA to lactic acid as a monomer and can be used for the recycle of PLA polymer.

Inheritance of Agronomic Traits and Their Interrelationship in Mungbean (Vigna radiata (L.) Wilczek)

Peerasak Srinives,Sukhumaporn Sriphadet,Christopher J. Lambrides 한국작물학회 2007 Journal of crop science and biotechnology Vol.10 No.4

A study was conducted to observe the variation and inheritance of agronomic traits and their interrelationship in mungbean. The objective of the study was to compare agronomic traits and hardseed percentage of 268 recombinant inbred lines (RILs) developed from the cross between wild Vigna subspecies sublobata “ACC 41” with the mungbean cultivar “Berken”. The RIL population and their parents were evaluated under controlled conditions in a glass house at the University of Queensland, Brisbane, Australia. The results showed significant differences among the RILs and among the parents in all traits under study. Berken had a longer flowering date and a higher seed weight per plant, but less total leaf number and pod number per plant than ACC 41. A germination test between papers revealed that ACC 41 was 100% hard-seeded and did not germinate at all, while Berken germinated up to 100%. Their RILs distributed well between 0 to 100% hardseed. Upon scarification, all hardseed germinated within seven days. Narrowsense heritability estimates of total leave number, hardseedness, pod length, and pod width were highly heritable at 89.9, 98.9, 93.7, and 93.2%, respectively. The heritability of seed weight per plant and number of seeds per plant were lower at 63.1 and 58.4%, respectively. Seed weight per plant showed positive transgressive segregation when compared with ACC 41 and a positive correlation with 100 seed weight. While the number of seeds per pod showed a negative transgressive segregation when compared with Berken and a negative correlation with pod length and pod width. The RILs gave a 1:1 segregation ratio in leaflet shape, growth habit, and growth pattern, indicating that these traits were controlled by a single dominant gene. A study was conducted to observe the variation and inheritance of agronomic traits and their interrelationship in mungbean. The objective of the study was to compare agronomic traits and hardseed percentage of 268 recombinant inbred lines (RILs) developed from the cross between wild Vigna subspecies sublobata “ACC 41” with the mungbean cultivar “Berken”. The RIL population and their parents were evaluated under controlled conditions in a glass house at the University of Queensland, Brisbane, Australia. The results showed significant differences among the RILs and among the parents in all traits under study. Berken had a longer flowering date and a higher seed weight per plant, but less total leaf number and pod number per plant than ACC 41. A germination test between papers revealed that ACC 41 was 100% hard-seeded and did not germinate at all, while Berken germinated up to 100%. Their RILs distributed well between 0 to 100% hardseed. Upon scarification, all hardseed germinated within seven days. Narrowsense heritability estimates of total leave number, hardseedness, pod length, and pod width were highly heritable at 89.9, 98.9, 93.7, and 93.2%, respectively. The heritability of seed weight per plant and number of seeds per plant were lower at 63.1 and 58.4%, respectively. Seed weight per plant showed positive transgressive segregation when compared with ACC 41 and a positive correlation with 100 seed weight. While the number of seeds per pod showed a negative transgressive segregation when compared with Berken and a negative correlation with pod length and pod width. The RILs gave a 1:1 segregation ratio in leaflet shape, growth habit, and growth pattern, indicating that these traits were controlled by a single dominant gene.