Diversity and dynamics of endophytic heterotrophic (HB), spore forming (SFB), spore-crystal forming (SCB), nitrifying (NB), denitrifying (DNB), phosphate solubilizing (PSB) bacteria, actinomycetes (ACT) and fungi (FUN) in leaf, stem and root of leaf folder tolerant (PTB-12 and Nivara) and susceptible (Naveen and Tapaswini) rice (Oryza spp.) genotypes were analyzed which are unattained to date. Tapaswini roots produced all 8 types endophytes but that of Nivara, Naveen and PTB12 produced 6, 5 and 4 types of communities but stems and leaves had lower diversity. The HB, SFB and SCB were universal but NB, DNB, PSB, ACT and FUN had discrete occurrence. The SCB (Bacillus thuringiensis) was recorded first time from the cultivated rice genotypes. Quantum (x102 cfu/g dr. wt.) of endophytic microbes in different parts of the rices were 0.05-53.14; higher population of HB was in O. nivara stem (4.23) and root (53.14), Naveen leaf (10.40), and SF (44.11) or SCF (41.91) in Tapaswini root. At least one part of each plant had endophytic FUN (0.05-0.88 x102 cfu/g) but ACT (0.33-1.09 x102 cfu/g) was present in root of most rices, DNB (0.05-1.33 x 102 cfu/g) was less pronounced, NB (0.05-4.10 x 102 cfu/g) was undetectable in leaf, and PSB (1.00 x 102 cfu/g) was present in Tapaswini root only. Broadly, the endophytic microbes were 2-4 exponent lower than the native soil microbial pool. Wide dynamics and diversity of beneficial endo-microbial communities would variously help growth and development of the rice genotypes, and the B. thuringiensis would intrinsically suppress rice pests and diseases.
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