Effect of microbial biofilms inoculated to selected forest trees at nursery stage

Kankanthri Nirodha Weeraratne, Janaka Kuruppuarachchi, Gamini Seneviratne

Research output: Other contribution to conferenceAbstractpeer-review


In Sri Lanka, forest cover is declining at the rate of 1.5%, annually. In order to sustain the forestcover of 29%, reforestation efforts have been undertaken using native or exotic plant species.However, nursery plants face up to 50% failure in establishment in reforestation. Incapability ofexotic species to establish in sufficient numbers on degraded lands has been thought to be due tolack of supporting soil microbial consortia. Therefore, attention has been paid to use native trees,which are however hindered by slow growth rate. Thus, the use of beneficial microbial inoculawould facilitate the early survival and rapid growth of seedlings, through biological nitrogenfixation, soil moisture conservation, improved soil-plant nutrient cycling, secretion of growthhormones etc. An inoculum of beneficial microbes was developed in biofilm form, by usingbacterial isolates from the rhizosphere of five native tree species namely, Diospyros ebenum(Ebony), Berrya cordifolia (Trincomalee wood), Azadirachta indica (Neem), Cassia fistula(Golden shower tree), Chloroxylon swietenia (Satinwood) and Chukrasia tabularis (Burmesealmond wood). Isolated bacteria were screened for their ability of biological nitrogen fixation,organic acid production, solubilization of phosphate and plant growth promoting effect. Ninediazotrophic bacteria were selected a
Original languageEnglish
Number of pages1
Publication statusPublished - 2012
Event32nd Annual Sessions of Institute of Biology - Sausiripaya Auditorium, Colombo 7, Colombo, Sri Lanka
Duration: 27 Sep 201227 Sep 2012


Conference32nd Annual Sessions of Institute of Biology
Abbreviated titleEcotoxicology: A discipline of growing importance
Country/TerritorySri Lanka
Internet address


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