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Biological suppression of rice diseases by Pseudomonas spp. under saline soil conditions

机译：假单胞菌对水稻疾病的生物抑制。在盐渍土壤条件下

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摘要

The aim of this study was to develop antagonistic strains specific for the coastal agricultural niche in Southern India. Indigenous Pseudomonas strains isolated from rhizosphere of rice cultivated in the coastal agri-ecosystem were screened for in vitro antibiosis against Xanthomonas oryzae pv. oryzae and Rhizoctonia solani - the bacterial leaf blight (BB) and sheath blight (ShB) pathogens of rice (Oryza sativa) respectively. The strains exhibiting antibiosis were tested in the greenhouse under normal and saline soil conditions. The antagonists suppressed BB by 15 to 74% in an unamended soil. The efficient strains were tested under saline soil conditions and found to suppress disease by 46 to 82%. Similarly, incidence of ShB was also suppressed by 30 to 57% in the unamended soil by the efficient strains which, under saline soil conditions, were found to suppress ShB by 19 to 51%. Four strains of Pseudomonas tested suppressed both BB and ShB diseases in rice, of which three were efficient under both natural and saline soil conditions.
机译：这项研究的目的是开发印度南部沿海农业生态位特有的拮抗菌株。从在沿海农业生态系统中种植的水稻根际分离出的本地假单胞菌菌株进行了体外抗黄单胞菌PV的抗生性筛选。水稻和茄根枯萎病菌-分别是水稻（Oryza sativa）的细菌性叶枯病（BB）和鞘枯病（ShB）病原体。在正常和盐渍土壤条件下，在温室中测试表现出抗微生物作用的菌株。在未改良的土壤中，拮抗剂可将BB抑制15％至74％。在盐渍土壤条件下对有效菌株进行了测试，发现该菌株可抑制46％至82％的疾病。同样，在有效土壤中，在盐渍土壤条件下，ShB的发生率也降低了30％至57％，有效菌株可将ShB抑制了19％至51％。测试的四株假单胞菌可同时抑制水稻的BB和ShB病，其中三株在自然和盐渍土壤条件下均有效。

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