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J. A. Thompson Ampan Bhromsiri Arawan Shutsrirung Srisook Lillakan 《Plant and Soil》1991,135(1):53-65
Over 1500 root-nodule bacteria were isolated from a range of uninoculated soybeans, and one cowpea, trap-hosts, sown in 1985 into traditional soybean-growing areas of soybean-growing areas of northern Thailand. Most isolates were slow-growing Bradyrhizobium japonicum. Using a modified bottle-jar technique, 586 of the isolates were tested with a range of soybean hosts and one cowpea host. The results indicated:
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(a) | a very high level of infectiveness, with only one isolate failing to nodulate one host, and 95% forming \s>20 nodules per plant; |
(b) | a high level of effectiveness of fixation of nitrogen by the local rhizobium populations with soybeans; |
(c) | evidence of selection of effective strains by both soybean and cowpea hosts in the field; |
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Phylogeny and distribution of extra-slow-growing Bradyrhizobium japonicum harboring high copy numbers of RSα, RSβ and IS1631 总被引:1,自引:0,他引:1
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K. Chinachanta A. Shutsrirung L. Herrmann D. Lesueur 《Letters in applied microbiology》2022,74(3):354-366
Indole-3-acetic acid (IAA) synthesis is a major property of rhizosphere bacteria. The IAA-producing ability of rhizobacteria may be influenced by agricultural management. We therefore evaluated the IAA-producing potential of rhizobacteria isolated during organic rice farming (ORF) and conventional rice farming (CRF) in Thung Kula Rong Hai areas of Thailand. The results indicated that ORF gave a significantly higher percentage of IAA producers (95·8%) than CRF (69·9%). The average IAA values of the ORF isolates were around two times higher than those of the CRF isolates both in the absence (12·8 and 5·8 μg IAA ml−1, respectively) and presence of L-tryptophan (L-Trp) (35·2 and 17·2 μg IAA ml−1, respectively). The 16S rRNA gene sequence analysis indicated that the 23 selected isolates belonged to 8 different genera—Sinomonas sp., Micrococcus sp., Microbacterium sp., Fictibacillus sp., Bacillus sp., Burkholderia sp., Leclercia sp. and Enterobacter sp. Interestingly, only three ORF isolates, i.e. ORF15-20 (Micrococcus sp.), ORF15-21 (Sinomonas sp.) and ORF15-23 (Sinomonas sp.), exhibited high IAA production ability without L-Trp (128·5, 160·8 and 174·7 μg IAA ml−1, respectively). Meanwhile, a slight decrease in IAA production with L-Trp was noticed, suggesting that the L-Trp was not used for the IAA synthesis of these isolates. Biopriming with rhizobacterial isolates significantly enhanced the rate of germination of KDML 105 rice seeds compared to the control. 相似文献
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