Plant growth promoting bacteria confer salt tolerance in Vigna radiata by up-regulating antioxidant defense and biological soil fertility
Plant growth promoting bacteria confer salt tolerance in Vigna radiata by up-regulating antioxidant defense and biological soil fertility
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DOI：
10.1007/s10725-015-0142-y
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发表时间：
2016-09-01
影响因子：
4.2
通讯作者：
Zhou, Weijun
中科院分区：
文献类型：
--
作者：
Islam, Faisal;Yasmeen, Tahira;Zhou, Weijun
盐胁迫是一种常见的非生物胁迫，是全球农作物生产的主要限制因素。研究了从咸水灌溉土壤中分离的植物根际促生细菌（PGPR）蜡状芽孢杆菌Pb 25在盐胁迫（9 dSm（-1））和盐胁迫（10 dSm（-1））下对绿豆生长的促进作用。结果表明，B.即使在盐的存在下，蜡状芽孢杆菌也能显著促进辐射葡萄的生长。与未进行细菌处理的植物（对照）相比，接种PGPR改善了植物生长，并增加了根、茎的鲜生物量和干生物量以及产量。结果表明，盐胁迫抑制了叶绿素含量和植株生长，并减轻了盐诱导的氧化损伤（MDA，H2 O2）接种PGPR。此外，PGPR还显著提高了盐胁迫下番茄体内抗氧化酶（POD、SOD和CAT）的活性，促进了脯氨酸、钾、氮和磷的积累，降低了钠的积累。在土壤生物活性方面，接种PGPR处理提高了盐胁迫下土壤脱氢酶、碱性磷酸酶、微生物量碳、有效磷和总有机碳的活性。这些结果表明，B.蜡状芽孢杆菌可作为生物接种剂用于盐碱化农田，以提高作物产量。
Salinity, a frequently occurring abiotic stress, is a major constraint for crop productivity worldwide. The present study was conducted to evaluate the ability of plant growth promoting rhizobacteria (PGPR) Bacillus cereus Pb25, isolated from soil irrigated with saline water, to promote Vigna radiate (mungbean) growth in the absence and presence of salt stress (9 dS m(-1)). Results demonstrated that B. cereus promoted V. radiate plant growth significantly even in the presence of salt. Inoculations with PGPR improved the plant growth, and increased the root, shoot fresh and dry biomass and yield as compared to plants with no bacterial treatment (control). Results showed that both chlorophyll content and plant growth were inhibited by saline stress and the salt-induced oxidative damage (measured by MDA, H2O2) was alleviated by PGPR inoculation. Furthermore, PGPR inoculation significantly increased the antioxidant enzymes (POD, SOD and CAT) activities and enhanced the accumulation of proline, potassium, nitrogen and phosphorus as well as decreased sodium accumulation in saline stressed plants. Regarding the soil biological activity, inoculated PGPR enhanced the activity of dehydrogenase, alkaline phosphatase, microbial biomass carbon, available phosphorus and total organic carbon under saline stress as compared to saline treatment alone. These results suggest that B. cereus can be used in salinized agricultural lands as bio-inoculant to increase crop productivity.