Using signal molecule genistein to alleviate the stress of suboptimal root zone temperature on soybean-Bradyrhizobium symbiosis under different soil textures

Abstract

Suboptimal root zone temperatures (RZTs) (below 258C) in Canada until July may adversely affect the secretion of interorganismal signal molecules such as genistein by soybean and hence, the soybean-Bradyrhizobium symbiosis. We also proposed for the first time that soil texture might play a role in these biochemical communications. Soybean plants, planted in undisturbed soil samples (with sandy, loamy and clay textures), collected from the field, were subjected to three different soil temperatures (14, 19 and 248C). Bradyrhizobium japonicum (strain 532C) inocula, preincubated with four levels of genistein (0, 5, 10 and 20 mM), were used to inoculate the plants. The experiment was conducted at the research greenhouse of Macdonald Campus, McGill University, Canada. The effects of genistein 5 and 20 mM on soybean nodulation and growth were significant at 148C. As genistein was more effective in loamy and clay soils, soil texture may also be a determining factor in the biochemical communications between B. japonicum and soybean.

Arbuscular Mycorrhiza in Crop Improvement under Environmental Stress

“…Therefore, to overcome losses in crop production due to environmental stresses, we need to find alternatives that are less expensive and more environmentally friendly. Thus, employing/exploiting biological methods for alleviating the negative impact of stresses is receiving the attention of researchers Giri and Mukerji, 2004;Miransari et al, 2007Miransari and Smith, 2008).…”

Development of a Soil N Test for Fertilizer Requirements for Wheat

“…Precipitation can also affect the rate of NO − 3 -N leaching and microbial activity. Soil type can also affect bacterial activities (Miransari and Smith, 2008) and movement of soil NO − 3 -N in the soil. This experiment was designed in order to include numerous wheat sites with a wide range of climatic Downloaded by [Florida State University] at 08:19 03 January 2015…”

The use of mycorrhizal inoculation in the domestication of Ziziphus mauritiana and Tamarindus indica in Mali (West Africa)

“…Due to loss of tree cover, most of the naturally occurring soil-borne mycorrhiza in agroforestry parkland systems may have been lost. In order to restore the loss of vegetation through domestication, plants can be inoculated with laboratory grown arbuscular mycorrhizas to enhance their establishment in agroforestry parkland systems (Bethlenfalvay 1992;Miransari and Smith 2008). Responses of plants to AM inoculation differ with respect to functional compatibility, measured as mycorrhizal formation, root colonization, external hyphal length and relative mycorrhizal dependency (RMD) (Ravnskov and Jacobsen 1995;Bâ et al 2000).…”