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首页> 外文期刊>Acta Physiologiae Plantarum >Isolation and molecular characterization of plant growth-promoting Bacillus spp. and their impact on sugarcane (Saccharum spp. hybrids) growth and tolerance towards drought stress
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Isolation and molecular characterization of plant growth-promoting Bacillus spp. and their impact on sugarcane (Saccharum spp. hybrids) growth and tolerance towards drought stress

机译：植物生长促进芽孢杆菌SPP的分离与分子表征。 及其对甘蔗的影响（Saccharum SPP。杂交种）生长和对干旱胁迫的耐受性

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Plant growth-promoting rhizobacteria (PGPR) have demonstrated its importance in agriculture globally including beneficial dynamics change in plant rhizosphere leading better tolerance towards abiotic stresses. Hundred and one bacterial cultures from sugarcane rhizosphere zone of &50years of sugarcane growing fields were isolated using standard protocols and were further subjected to in vitro screening to visualize their impact on plant growth. Of these, two cultures based on biochemical test and 16S rRNA gene sequences were classified as Bacillus subtilis (BSSC11) and Bacillus megaterium (BMSE7). Sugarcane settlings exposed to these strains exhibited more nutrient content, improved growth in terms of early sprouting, increased vigor (high shoot and root weight) and better antioxidant enzyme system ability including quantitative overexpression of superoxide dismutase (SOD) isoforms over controls. Treated cane seed (setts) with B. megaterium culture exhibited high expression of invertase genes which facilitated early and improved growth of settlings through increased inversion of sucrose to glucose and fructose. When these settlings were exposed to drought, a significant decrease in SOD enzyme activity and increase in proline content was observed especially in B. megaterium-exposed samples indicating less generation of free radicals in inoculated than those of non-inoculated samples where SOD activity increased significantly. This is apparently a first study of PGPRs isolated from continuous growing sugarcane fields on the growth and vigor of sugarcane settlings in vivo and further hypothesized that a multiple chain of events is involved in imparting better crop growth of PGPR-exposed settlings both under normal and stress conditions.
机译：植物生长促进的流离虫（PGPR）（PGPR）已经证明其在全球的农业重要性，包括植物根际的有益动态变化，从而更好地对非生物应激的耐受性。来自＆amp的甘蔗根际区的一百一细菌培养物; GT;使用标准方案分离50年甘蔗生长田，并进一步进行体外筛选，以使其对植物生长的影响。其中，基于生物化学测试和16S rRNA基因序列的两种培养物被归类为枯草芽孢杆菌（BSSC11）和芽孢杆菌（BMSE7）。暴露于这些菌株的甘蔗沉降表现出更多的营养含量，提高早期发芽的增长，增加了活力（高芽和根部重量），更好地抗氧化酶体系能力，包括过表达超氧化物歧化酶（SOD）同种型的对照。用B.绵羊培养物的治疗蔗种子（Setts）表现出高表达转化酶基因，其通过增加蔗糖转化与葡萄糖和果糖的转化促进和改善沉降的生长。当这些沉降暴露于干旱时，特别是在B. MegiSium暴露的样品中观察到SOD酶活性和脯氨酸含量的增加，表明在接种的非接种样品中产生的自由基较少，其中SOD活性显着增加。这显然是对甘蔗沉降的生长和活力的第一次研究了Vivo中的生长和活力，进一步假设了多链事件涉及在正常和压力下赋予PGPR暴露沉降的更好作物生长状况。

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