英语翻译Four sets of rhizobial strain combinations were prepared

英语翻译
Four sets of rhizobial strain combinations were prepared
to illustrate competitiveness between (i) two different
phage-sensitive (MPSR033 vs.MPSR220) strains; (ii)
phage sensitive (MPSR033) versus phage resistant marked
with streptomycin-resistant (MPSR033 Smr Vr) strains;
(iii) phage sensitive (MPSR220) versus phage resistant
marked with gentamicin-resistant (MPSR220 Gmr Vr)
strains,and (iv) two different phage- and antibiotic-resistant
(MPSR033 Smr Vr vs.MPSR220 Gmr Vr) strains.The
cells of two rhizobial strains in each set of combination
were mixed in 1:1 proportion and used as inoculant.For
preparation of mixed inoculum,the bacterial population of
each strain was adjusted to 107 viable cells (cfu) ml-1 with
sterile distilled water and then mixed in required
proportions.