Nitrate Transport and Distribution in Soybean Plants With Dual-Root Systems.

Frontiers in Plant Science
Sha LiZhenping Gong

Abstract

Nitrate absorbed by soybean (Glycine max L. Merr.) roots from the soil can promote plant growth, while nitrate transported to nodules inhibits nodulation and nodule nitrogen fixation activity. The aim of this study was to provide new insights into the inhibition of nodule nitrogen (N) fixation by characterizing the transport and distribution of nitrate in soybean plants. In this research, pot culture experiments were conducted using a dual root system of soybeans. In the first experiment, the distribution of 15N derived from nitrate was observed. In the second experiment, nitrate was supplied-withdrawal-resupplied to one side of dual-root system for nine consecutive days, and the other side was supplied with N-free solution. Nitrate contents in leaves, stems, petioles, the basal root of pealed skin and woody part at the grafting site were measured. Nitrate transport and distribution in soybean were analyzed combining the results of two experiments. The results showed that nitrate supplied to the N-supply side of the dual-root system was transported to the shoots immediately through the basal root pealed skin (the main transport route was via the phloem) and woody part (transport was chiefly related to the xylem). There was a tr...Continue Reading

References

Sep 12, 2002·Annual Review of Plant Biology·Brian G Forde
Sep 8, 2009·Journal of Plant Physiology·Kazuhisa KatoYoshinori Kanayama
May 7, 2010·Physiologia Plantarum·Saad SuliemanJoachim Schulze
May 17, 2011·The Plant Cell·Ya-Yun Wang, Yi-Fang Tsay
Feb 18, 2014·Journal of Experimental Botany·Anne KrappFrançoise Daniel-Vedele
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May 24, 2016·Molecular Plant·José A O'BrienRodrigo A Gutiérrez
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