Abstract The study investigated the possibility of growth-promoting rhizobacteria to enhance plant growth capacities of Amaranthus hybridus and A. viridis in ferruginous ultisols comparative to humus. The experimental setup was divided into two groups; the first comprised of 2 weeks old plants that were inoculated using the rhizobacteria – Pseudomonas putida, P. fluorescence and a combination of both in the ratio of 1:1, in both humus (HMS) and ferruginous red (FRS) soils. The second consisted of seeds of the test plants bioprimed with the bacteria in filtrates of HMS and FRS respectively. Germination percentage in the Pseudomonas-exposed seeds was better when seeds were primed for 24 h than for 3 h in both plant species. Further, results showed that plants sown in the ferruginous soil were short-lived compared to those sown in humus containing soil irrespective of microbial treatments. The growth parameters of plants inoculated with the Pseudomonas species were better than the uninoculated plants and plants sown in the humus soil. Qualitative assessment of phytochemicals showed the presence of saponins, phenolic, tannins, terpenoids, alkaloids, and flavonoids in both species notwithstanding inoculation. The presence of glycosides in plants inoculated with P. pseudomonas was reported, but not in the control plants. Significant reduction in total phenols upon inoculation of plants with P. putida was also reported. Following the failure of FRS-exposed plants to subsist, in-vitro growth studies were conducted to compare seed growth response. Results suggest that seeds sown in FRS-filtrates performed better than those in HMS-filtrates. Pseudomonas species improves the growth, development and stress tolerance of Amaranthus species in humus soil.

中文翻译：

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Amaranthus [L.] 物种在腐殖质和铁质 Ultisol 中使用植物生长促进根际细菌（假单胞菌属物种）的比较生长响应

摘要 本研究调查了促进生长的根际细菌在与腐殖质相比的铁质长效溶胶中增强 Amaranthus hybridus 和 A. viridis 植物生长能力的可能性。实验装置分为两组；第一个包括使用根际细菌 - 恶臭假单胞菌、荧光假单胞菌和两者以 1:1 的比例在腐殖质 (HMS) 和铁红 (FRS) 土壤中接种的 2 周龄植物。第二种由分别用 HMS 和 FRS 滤液中的细菌进行生物引发的测试植物的种子组成。在两种植物中，暴露于假单胞菌的种子中的萌发百分比在种子 24 小时后比 3 小时更好。更多，结果表明，与在含腐殖质土壤中播种的植物相比，无论进行何种微生物处理，在铁质土壤中播种的植物寿命都很短。接种假单胞菌的植物的生长参数优于未接种的植物和种植在腐殖质土壤中的植物。植物化学物质的定性评估表明，尽管进行了接种，这两个物种中仍存在皂苷、酚类、单宁、萜类、生物碱和类黄酮。据报道，在接种假单胞菌的植物中存在糖苷，但在对照植物中没有。还报道了用恶臭假单胞菌接种植物后总酚的显着减少。在暴露于 FRS 的植物无法生存之后，进行了体外生长研究以比较种子生长反应。结果表明，播种在 FRS 滤液中的种子比 HMS 滤液中的种子表现更好。假单胞菌物种提高了腐殖质土壤中苋属植物的生长、发育和胁迫耐受性。