Vanessa Cris D. Blancaflor 1, Jocelyn T. Zarate 2 and Celia B. Dela Viña 3 1, 3
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1 Morphological, Biochemical and Molecular Characterization Of Gibberellic Acid- Producing Bacteria, Isolated from Saccharum sp. and Eleusine sp. and Their Effect On The Growth Of Corn and Lettuce Vanessa Cris D. Blancaflor 1, Jocelyn T. Zarate 2 and Celia B. Dela Viña 3 1, 3 Institute of Biological Science, CAS, University of the Philippines Los Banos (UPLB) and 2 National Institute of Molecular Biology and Biotechnology (BIOTECH), UPLB, College, Laguna, Philippines
2 Introduction Gibberellic Acid (GA) Break seed dormancy Enhance stem and root elongation Delays senescence Produced as secondary metabolite by bacteria that functions as signaling factor to the host plant 136 known chemical structures GA 1, GA 2 and GA 4 for shoot elongation GA 3 removed inhibition of sugarcane growth due to salt stress
3 Objectives Characterize GA secreting bacteria from sugarcane and grass roots Quantify GA production Identify high GA producing strains through 16S rdna sequencing Determine effects of bacterial isolates on plant development
4 Isolation of Endophytic plant growth promoting Bacteria Qualitative and Quantitative Analysis Biochemical Partial Characterization Methodolology 16S rdna isolation and sequencing in vivo Assay in corn and lettuce as host plants
5 Isolation of endophytic PGPB Extraction from root tips of sugarcane and grass Serial Dilution Spread Plating on Congo red- Nitrogen Free medium and Azotobacter medium
6 Qualitative and quantitative analysis of Gibberellic acid GIBBERELLIC ACID PRODUCTION ASSAY (Graham and Thomas, 1961) Centrifugation: 6000rpm 12 minutes Addition of 2, 4-DNP to supernatant Boiling to 100 C Addition of Alcoholic KOH GIBBERELLIC ACID EXTRACTION Centrifuge: 10,000rpm, 10mins Acidification to ph2 of supernatant Extraction with Ethyl Acetate Redissolve GA residue in 0.05% Tween80
7 Qualitative and Quantitative Analysis of Gibberellic Acid Phosphomolybdic Acid Reagent (Graham and Henderson, 1961) Addition of 15ml Phosphomolyd ic acid reagent to GA extract Incubate in boiling water for one hour Addition of dh 2 O up to 25ml Measure absorbance at A780nm
8 Partial Characterization of Bacterial Isolates Gram Staining Method Crystal violet (1min) Gram-iodine (1min) 95% alcohol (30secs) 0.25% safranin (30secs)
9 Test for Oxygen Requirement Catalase Reaction Utilization of Citrate Starch Hydrolysis Test Tween80 Hydrolysis Gelatin Liquefaction test Acid Production from Carbohydrates Biochemical Tests
10 Molecular Identification of Bacterial Isolates Genomic DNA Extraction (CTAB Method) Gene Amplification FC/RC: 30 cycles FC27 (5 -AGAGTTTGATCCTGGCTCAG-3 ) RC1492 (5 -TACGGCTACCTTGTTACGACTT-3 ) Annealing Temp: 55 C 16S rdna Sequencing Basic Local Assignment Tool (BLAST)
11 In Vivo Assay
12 RESULTS AND DISCUSSION
13 Isolation of Plant Growth Promoting Bacteria Table 1. Number of bacterial isolates obtained from CRNF and ATB media and their assigned codes. Sample Sugarcane Grass Media No. of Isolates Isolate codes (VCB) CRNF 7 1-5sc, 16-17sc ATB sa CRNF 8 6-8gc, 18-22gc ATB ga Legend: (CRNF) Congo-red Nitrogen-free medium, (ATB) Azotobacter medium Fig. 1. Representative solution color from result of the Gibberellic Acid Assay
14 Quantification of GA produced GA Concentration (µg/ml) VCB6gc VCB7gc VCB11ga VCB12sa VCB16sc VCB17sc Bacterial Isolates Fig. 3. Concentrations of GA produced by bacterial isolates Standard Curve of Gibberellic Acid
15 Partial Characterization of Bacterial Isolates Bacterial Isolate VCB6gc VCB7gc VCB11ga VCB12sa VCB16sc VCB17sc Colony Morphology Cloudy white, curled, flat Colony size Gram Reaction Cell Morphology Cell size 1-1.5mm - rod 1-1.5µm Cloudy white, entire, convex 1-1.5mm - rod Yellow, entire, convex 1-1.5µm 1-1.5mm - rod 3-5µm Cloudy white, curled, raised 1-1.5mm + cocci 1-2µm Yellow, entire, convex 1.5-2mm + cocci 1-2µm Cloudy white, entire, convex 1.5-2mm + cocci 1-1.5µm
16 Table 3. Summary of Biochemical Tests. Biochemical Characterization Isolate codes Oxygen Req. Catalase Reaction Gelatin Liq. Utilization of Citrate Starch Hydrolysis Tween 80 Hydrolysis VCB6gc Aerobic VCB7gc Aerobic VCB11ga Aerobic VCB12sa Facultative Anaerobe VCB16sc Aerobic VCb17sc Facultative Anaerobe
17 Biochemical Characterization Acid Production from Carbohydrates Table 4. Acid and gas production of isolated bacteria from carbohydrates. Sugars Bacterial Isolates VCB6 VCB7 VCB1 VCB1 VCB1 VCB1 gc gc 1ga 2sa 6sc 7sc Dulcitol -/- -/- -/- -/- -/- +/- Glucose +/- +/- +/- +/- +/- +/- Lactose -/- -/- -/- +/- -/- +/+ Maltose -/- -/- -/- +/- -/- +/- Mannitol -/- -/- -/- -/- -/- +/+ Mannose -/- -/- -/- +/- -/- +/- Sorbitol -/- -/- -/- -/- -/- +/+ Sucrose -/- -/- -/- +/- -/- +/+ Legend: Acid Production/ Gas Production
18 Bacterial Isolates VCB6gc VCB7gc VCB11ga VCB12sa VCB16sa VCB17sa Description Pseudomonas hibiscicola strain ATCC Paenibacillus lautus strain NBRC Stenotrophomonas pavanii strain LMG Micrococcus yunnanensis strain YIM Staphylococcus hominis sbs. novobiosepticus strain GTC 1228 Molecular Characterization with 16s DNA sequencing Length (bp) Score (bits) E value Identities % % % e % % % Staphylococcus aureus (identified through biochemical characteristics)
19 Isolates Description Related Literature Review VCB6gc VCB7gc VCB11ga VCB12sa VCB16sa Pseudomonas hibiscicola strain ATCC Paenibacillus lautus strain NBRC Stenotrophomonas pavanii strain LMG Micrococcus yunnanensis strain YIM Staphylococcus hominis sbs. novobiosepticus strain GTC 1228 Molecular Characterization with 16s DNA sequencing Type strains of P. hibiscola belong to S. maltophilia, a Gram neg; catalase +; use in biotechnological applications; may cause nosocomial infection: PGPB with P removal and N2 fixation properties; biocatalyst for functional health food (World J of Microbiol and Biotech, 2008; ( Endophytic N 2 Fixer from Brazilian sugarcane variety used in Organic farming (Ramost et al Int J Sys Evol Microbiol (4):926-31) Catabolically versatile; produce restriction enzymes and vitamins; isolated from Polyspora axillary roots; ( Coagulase negative, found in the skin, blood etc, antibiotic resistant; biofilm former; (
20 In Vivo Assay Effect of Bacterial Isolates with on the Growth of Corn (Zea mays L.) - Control + Control VCB 6 VCB 7 VCB 11 VCB 12 VCB 16 VCB 17 Mixed Inoc
21 - Control + Control VCB 6 VCB 7 VCB 11 VCB 12 VCB 16 VCB 17 Mixed Inoc In Vivo Assay Effect of Bacterial Isolates with Rec. Rate (RR) of Chem Fertilizer ( kg NPK/ha) on the Growth of Corn
22 In Vivo Assay -Control +Control VCB6 VCB 7 VCB 11 VCB 12 VCB 16 VCB 17 Mix Fig. 14. Representative root samples of corn (Zea mays L.) grown for two months under screen house condition as affected by bacterial inoculation and with no chemical fertilizer (top) and with Rec. Rate of chemical (RR): T1(-control), T2(+control), T3 (VCB6), T4(VCB7), T5(VCB11), T6(VCB12), T7(VCB16), T8(VCB17), and T9(Mixed inoculants).
23 In Vivo Assay -Control +Control VCB6 VCB 7 VCB 11 VCB 12 VCB 16 VCB 17 Mix Fig. 15. Representative plant samples of lettuce (L. sativa) grown for two months under screen house condition with zero(up) and full(down) recommended rates of chemical fertilizer (RR) and microbial inoculation: T1(-control), T2(+control), T3 (VCB6), T4(VCB7), T5(VCB11), T6(VCB12), T7(VCB16), T8(VCB17), and T9(Mixed inoculants).
24 Summary Endophytic bacteria from sugarcane and grass roots were isolated with capacity to produce GA (6/22) GA concentration ranged from 34.11µg ml µg ml -1 highest in strain VCB6gc; lowest in VCB11ga Biochemical characterization was enlightening, but tedious work Molecular characterization gave insight in ID of isolates GA production is also done by commensal or pathogenic strains as well as plant growth promoting bacteria GA producing isolates enhanced corn stem length and roots GA production has positive combination with chemical fertilizer
25 Conclusion Use of beneficial microorganisms with PGPB properties (ie GA production) should be encouraged for better plant growth More in vivo trials should be done on other crops to show positive effect of GA producing isolates Microbial isolates need further characterization through polyphasic analysis since percent identities were <97% suggesting that they could be possible novel strains or species.
26 Thank you for your kind attention! Acknowledgement: PCAARRD funding agency BIOTECH IBS, CAS Students and staff at MykoPlus Laboratory
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