Abstrak

Baca Juga : EFEKTIFITAS DAYA HAMBAT RIZOBAKTERI TERHADAP PATOGEN TERBAWA BENIH SECARA IN VITRO DAN PERANANNYA SEBAGAI PEMACU PERTUMBUHAN TANAMAN TERHADAP VIABILITAS DAN VIGOR BENIH PADA DUA VARIETAS CABAI MERAH (CAPSICUM ANNUUM L.) (Malikul Mulki, 2018) ,

Baca Juga : : EFEKTIVITAS RIZOBAKTERI KANDIDAT AGENS BIOKONTROL TERHADAP DAYA HAMBAT PERTUMBUHAN KOLONI PHYTHIUM SP SERTA PENGARUHNYA TERHADAP VIABILITAS DAN VIGOR DUA VARIETAS BENIH TOMAT (LYCOPERSICUM ESCULENTUM MILL.) (Annisa Humaira, 2017) ,

ersitas syiah kuala, darussalam banda aceh. pelaksanaan penelitian dimulai dari februari sampai juni 2020. penelitian ini menggunakan rancangan acak lengkap (ral) non faktorial. faktor yang diteliti adalah isolat rizobakteri sebanyak 15 yang diulang sebanyak 3 kali. rizobakteri yang digunakan merupakan uji potensi awal rizobakteri hasil isolasi sebanyak 45 isolat rizobakteri yang diperoleh dengan patogen colletotrichum spp. pada media pda secara in vitro. isolat rizobakteri agens biokontrol diuji kemampuannya dalam menghambat patogen colletotrichum spp. dimana rizobakteri diberi simbol r dan cendawan patogen diberi simbol p. parameter yang diamati pada penelitian ini adalah persentase penghambatan pertumbuhan koloni patogen colletotrichum spp., laju penghambatan pertumbuhan koloni patogen colletotrichum spp., dan kemampuan rizobakteri dalam melarutkan fosfat. hasil penelitian yang dilakukan menunjukkan bahwa pengujian 15 isolat rizobakteri kandidat agens biokontrol memiliki kemampuan dalam menghambat koloni patogen colletotrichum spp. isolat yang memiliki persentase daya hambat tertinggi yaitu ldg 6/4 c yaitu sebesar 68,50% dengan kategori daya hambat tinggi (+++= 61-70% dh), sedangkan laju penghambatan yang tinggi yaitu rizobakteri ldg 3/1p dan ldg 7/7 sebesar 3,15 mm/hari. dari 15 isolat rizobakteri yang diuji kemampuannya dalam melarutkan fosfat, terdapat 9 rizobakteri yang mampu melarutkan fosfat yaitu ldg 3/1p, ldg 3/3, ldg 3/6, ldg 4/1p, ldg 4/1ct, ldg 4/2p, ldg 4/9, ldg 6/2, dan ldg 6/4c dan 6 rizobakteri lainnya tidak mampu dalam melarutkan fosfat yaitu ldg 3/3, ldg 5/2, ldg 5/3, ldg 6/5, ldg 7/3, dan ldg 7/7. kata kunci : antraknosa, fosfat, isolat, kandidat, koloni. abstract. this research aims to determine isolate of rhizobacteria that have the potential as biocontrol agents candidates for the pathogenic colony colletotrichum spp. and causes of anthracnose disease in chili plants and as a rhizobacteria that stimulates plant growth in vitro. the research was conducted at the seed science and technology laboratory of the department of agrotechnology, faculty of agriculture, syiah kuala university, banda aceh. the research will be carried out from february to june 2020. this research used a completely randomized design (crd) non factorial. the factors studied in this research were 15 rhizobacterial isolates which were repeated 3 times. the used of rizobacteria was an initial potential test of rhizobacteria as many as 45 isolates of rhizobacteria which were obtained with the pathogen colletotrichum spp. on pda media in vitro. rhizobacterial isolates of biocontrol agents were tested for their ability to inhibit the pathogen colletotrichum spp. where rhizobacteria are given the symbol r and pathogenic fungi are given the symbol p. the parameter observed in this research was the percentage of growth inhibition of pathogenic colonies colletotrichum spp., the rate of inhibition of growth of pathogenic colonies colletotrichum spp., and the ability of rizobacteria to dissolve phosphate. the results of the research showed that testing of 15 rhizobacterial isolates of biocontrol agents had the ability to inhibit the pathogenic colony of colletotrichum spp. the isolate which has the highest percentage of inhibitory power is ldg 6/4 c, which is 68.50% with a high inhibitory category (+++= 61-70% dh), while the high inhibitory rate is rizobacteria ldg 3/1p and ldg 7/7 at 3.15 mm/day. from 15 rhizobacteria isolates tested for their ability to dissolve phosphate, there were 9 rhizobacteria which is able to dissolve phosphate, namely ldg 3/1p, ldg 3/3, ldg 3/6, ldg 4/1p, ldg 4/1ct, ldg 4/2p, ldg 4/9, ldg 6/2, and ldg 6/4c and the other of 6 rhizobacteria were not able to dissolve phosphate, namely ldg 3/2, ldg 5/2, ldg 5/3, ldg 6/5, ldg 7/3, and ldg 7/7. keywords : anthracnose, phosphate, isolate, candidate,

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