Journal of Taiwan Agricultural Research

Author:Shiuan-Yuh Chien*, Hsin-Der Sih, Chien-Yih Lin, Ming-Hui Chang, and Pan-Chi Liuo

Abstract:

    Transgenic (anti-papaya ring spot virus, Anti-PRSV) and non-transgenic papaya were planted randomLy in pot soil within the net house of Agricultural Research Institute, COA.  Soil was sampled once a month to determine soil microbial populations and available nutrient concentrations.  Experimental results showed total bacterium populations of soils increased with time between first and second months and hardly changed from second to sixth months, and total fungi populations of soils decreased with time between first and third months and hardly changed from fourth to sixth months.  0-20 cm deep soils had higher microbial populations and available nutrient concentrations than those of 20-40 cm deep soils.  The microbial populations including total bacteria, total fungi, free living nitrogen-fixing bacteria, phosphate-solubilizing bacteria and protease bacteria, and soil monitoring factors, such as available nitrogen, phosphate and potassium, pH and electrical conductivity were not significantly different between transgenic and non-transgenic papaya by t-test (p<0.05).

Key words:Transgenic papaya, Papaya ring spot virus (PRSV), Soil microbial populations, Soil available nutrients

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