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PENCEMARAN TANAH — Bioavailabilitas logam berat beracun


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PENCEMARAN TANAH  –  Bioavailabilitas logam berat beracun
Rhizobateria tanah juga bisa langsung mempengaruhi kelarutan logam dengan mengubah spesiasi logam berat dalam rizosfer . Studi peran mikoriza dalam spesiasi logam di rhizosfer dan berdampak pada peningkatan toleransi tanaman inang terhadap logam berat yang berlebihan dalam tanah menunjukkan bahwa spesiasi Cu , Zn dan Pb berubah secara signifikan dalam rizosfer AM ( mikoriza arbuskular ) terinfeksi dan non – terinfeksi jagung dibandingkan dengan tanah massal .

Perubahan terbesar adalah Cu tukar yang meningkat sebesar 26 % dan 43 % pada rizosfir yang tidak terinfeksi AM dan rhizosfir yang terinfeksi AM, daripada dalam  tanah .  Dengan pengecualian Cu yang terikat organik dalam rhizosfir yang terinfeksi AM , spesiasi lain yang stabil juga ada dalam rizosfer AM dan non – AM .  Cu diaktifkan dengan menginduksi rhizobakteri .

Zn dan Pb yang terikat dengan senyawa organik meningkat secara signifikan dalam rizosfer dibandingkan dengan yang ada dalam tanah .  Sebaliknya , karbonat dan oksida dari Fe,  Mn , Zn dan Pb,  tidak menunjukkan perubahan yang signifikan .

Hasil ini menunjukkan bahwa mikoriza dapat melindungi tanaman inangnya dari fitotoksisitas tembaga dan seng yang berlebihan , dengan jalan mengubah spesiasi yang vtersedia menjadi bentuk yang tidak tersedia. Fakta bahwa akumulasi tembaga dan seng dalam akar dan daun tanaman yang terinfeksi mikoriza secara signifikan lebih rendah dibandingkan dengan tanaman yang tidak terinfeksi;  ini menunjukkan bahwa mikoriza efisien membatasi serapan tembaga dan seng yang berlebihan ke dalam tanaman inangnya .

 

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