Effectiveness of plant growth promoting rhizobacteria on Bromus tomentellus Boiss seed germination, growth and nutrients uptake under drought stress
Effectiveness of plant growth promoting rhizobacteria on Bromus tomentellus Boiss seed germination, growth and nutrients uptake under drought stress
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DOI：
10.1016/j.sajb.2017.07.006
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发表时间：
2017-11-01
影响因子：
3.1
通讯作者：
Shirmohammadi, E.
中科院分区：
文献类型：
--
作者：
Delshadi, S.;Ebrahimi, M.;Shirmohammadi, E.
研究了干旱胁迫下促生菌对草地物种毛雀麦种子萌发、生长和养分吸收的影响。本研究采用完全随机设计的析因实验。第一因子为生物肥（棕色固氮菌= A，成团泛菌+恶臭泛菌= P，A + P组合）和对照（不施生物肥）。第二个因子是干旱胁迫，在田间持水量（FC）0.7 FC和0.4 FC三个水平上施加。结果表明，在干旱胁迫下，0.7 FC水平的A和P+ A处理均提高了B种子的发芽率。0.7FC处理的种子发芽率最低。以FC处理的发芽率最高。在0.4 FC水平的对照处理中，测得的发芽率最低。结果表明，在FC水平下，A和A+ P处理均能增加根长。0.7FC的磷处理根长最低。0.4FC水平下，A + P处理的枝长最高，A处理的枝长最低。在对照处理中，在FC水平下，地上部干重增加，但在FC水平下，处理P降低地上部干重。最高和最低的根干重分别在0.4 FC和FC水平的处理A中观察到。结果表明，处理A吸收了钾、铁、锌和锰。P处理增加了根和地上部对氮、磷和铁的吸收，而A+ P处理增加了根和地上部对钾和铁的吸收。结果表明，施用生物肥料能促进B的萌发和生长。tomentellus Boiss.特别是0.7FC和FC水平的肥料具有增加的性状，并且在减轻干旱胁迫的影响方面没有起到显著的作用。生物菌肥在B. tomentellus Boiss在恢复和改善牧场方面可能是有用的。(C)2017款萨博。Elsevier B.V.出版，保留所有权利。
The aim of the present study was to investigate the effect of growth-promoting bacteria on the germination, growth and nutrient uptake by rangeland species Bromus tomentellus Boiss under drought stress. The research was conducted as a factorial experiment in a completely randomized design. The first factor was bio-fertilizer (Azotobacter vinelandii = A, Pantoea agglomerans + P. putida = P, combined A + P and control (without biofertilizer). The second factor was drought stress, which was applied at three levels of field capacity (FC), 0.7 FC and 0.4 FC. The results showed, under drought stress, that both treatments A and P+ A at 0.7 FC level increased the seed germination rate of B. tomentellus Boiss, while the control treatment at 0.7 FC level had the lowest germination rate. Germination percentage in the treatment P at FC levelwas the highest. In the control treatment at 0.4 FC level, the lowest germination percentage was measured. The results showed that both treatments A and A+ P at FC level resulted in an increase in the root length. The P treatment at the level of 0.7 FC showed the lowest root length. Also, the highest and lowest shoot lengths were observed in treatments A + P and A at 0.4 FC level, respectively. In the control treatment, at FC level, the shoot dry weight was increased, but treatment P at FC level reduced the shoot dry weight. The highest and lowest root dry weights were observed in treatment A at 0.4 FC and FC levels, respectively. The results showed that treatment A absorbed potassium, iron, zinc and manganese. P treatment increased the uptake of nitrogen, phosphorus, and Fe, while treatment A+ P increased K and Fe in the root and shoot. In general, the results showed that the use of bio-fertilizers could increase the germination and growth of B. tomentellus Boiss. In particular, the fertilizers in 0.7 FC and FC levels had increased traits and played no significant role in mitigating the effects of drought stress. The application of bio-fertilizers on B. tomentellus Boiss could be useful in the restoration and improvement of rangelands. (C) 2017 SAAB. Published by Elsevier B.V. All rights reserved.