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Monica L. Elliott, J.A. McInroy, K. Xiong, J.H. Kim, H.D. Skipper, and E.A. Guertal

fluorescent pseudomonad species or which culturable bacilli species are present in the root zone. Although culturable bacteria may represent a small proportion of the total bacteria in the soil or rhizosphere ( Alexander, 2005 ), knowledge of the culturable

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Christopher S. Imler, Camila I. Arzola, and Gerardo H. Nunez

, such as blueberries ( Vaccinium spp. section cyanococcus). Development of cultivars and practices that reduce dependence on these inputs requires a better understanding of the processes that affect rhizosphere pH. Some herbaceous and woody plants can

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Lesley A. Judd, Brian E. Jackson, Ted C. Yap, and William C. Fonteno

rhizosphere conditions ( Jackson et al., 2005 ; Price et al., 2009 ; Wright and Wright, 2004 ). However, the Horhizotron™ works best with large-sized rootballs (3.8 to 11.4 L); the glass panels are not permanent and can move and crack; and the shade box does

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Lauren Lindsey, Raymon Shange, Ramble O. Ankumah, Desmond G. Mortley, and Sangita Karki

primarily through the utilization of enzymes ( Coleman et al., 2004 ). Alterations in the physical and chemical nature of soils may lead to shifts in the composition of the microbial community and changes in microbial function. Rhizosphere contains

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Xin Zhao, Qianqian Dong, Shubang Ni, Xiyong He, Hai Yue, Liang Tao, Yanli Nie, Caixian Tang, Fusuo Zhang, and Jianbo Shen

P. These species develop cluster roots and are adapted to low-P stresses associated with infertile soils ( Stephenson, 2005 ) through increasing root exudation of carboxylates, protons, and acid phosphatases in the rhizosphere, thus mobilizing

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Gerardo H. Nunez, James W. Olmstead, and Rebecca L. Darnell

strategy comprises the coordinated action of three complementary processes functioning at the plasma membrane (PM) of root epidermal cells: a) rhizosphere acidification, b) iron reduction, and c) transmembrane iron transport ( Jeong and Conolly, 2009

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Yongfeng Yang, Zhixiao Yang, Shizhou Yu, and Hongli Chen

to transform the fixed slow-release K into readily available K that can be absorbed by plants. It is hypothesized that malate release results in the building up of malate levels in the rhizosphere soil, where it increases the available K content ( Shi

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Ryohei Koyama, Hiromichi Itoh, Syuji Kimura, Ai Morioka, and Yuichi Uno

maintained at 20 °C. Drought stress treatment. Adult plants of leaf lettuce were subjected to drought stress to the rhizosphere by lowering the water level in the solution tub ( Fig. 1 ). To determine the ideal drought conditions, the water level was reduced

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Jacqueline Joshua and Margaret T. Mmbaga

et al., 2016 ), and were effective against Macrophomina root rot disease ( Mmbaga et al., 2018b ). The objectives of this study were 1) to identify soilborne pathogens from snap bean roots and rhizosphere soil where fungicides are not used in

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W.A. Bergfield, D.N. Sasseville, and R.J. Kremer

The fungicide benomyl (formulated as Benlate 50 DF) has been implicated in damage to several crops grown under warm, moist conditions. Although the target pathogen may be controlled, occurrence of population shifts in rhizosphere bacteria has been documented, with benomyl application. A growth chamber study to investigate the effects of benomyl on marigold (Tagetes patula) and subsequent effects on the populations of rhizosphere bacteria of marigold was performed. A one pound per one hundred gallon rate as foliar and drench treatments were applied to marigolds. Plant growth data and rhizosphere bacteria populations were recorded. Repeated application of the benomyl treatments significantly reduced the marigold root and shoot mass, 44% and 67% respectively, compared to controls. Repeated foliar applications of benomyl also resulted in necrotic lesions on marigold leaf margins. Rhizosphere bacteria total numbers differed between treatments, having a greater population for the drench rate than the foliar rate. These results suggest application of benomyl may have harmful nontarget effects, leading to production problems associated with its use.