NDLI: Effects of heterogeneous salinity on growth, water uptake, and tissue ion concentrations of alfalfa

Content Provider	Springer Nature Link
Author	Sun, Juanjuan Yang, Gaowen Zhang, Wenjun Zhang, Yingjun
Copyright Year	2016
Abstract	Soil salinity varies greatly in the plant rhizosphere. The effect of nonuniform salinity on the growth and physiology response of alfalfa plants was determined to improve understanding of salt stress tolerance mechanisms of alfalfa.Plant growth, predawn leaf water potential, water uptake, and tissue ionic content were studied in alfalfa plants grown hydroponically for 9 days using a split-root system, with uniform salinity or horizontally nonuniform salinity treatments (0/S, 75/S, and 150/S corresponding to 0, 75, and 150 mM NaCl on the low salt side, respectively).Compared with uniform high salinity, 0/S and 75/S treatments significantly increased the alfalfa shoot dry mass and stem extension rate. Compensatory water uptake by low salt roots of 0/S and 75/S treatments was observed. However, decreased leaf Na$^{+}$ concentration, increased leaf K$^{+}$/Na$^{+}$, and compensatory growth of roots on the low salt side were observed only following the 0/S treatment.Nonuniform salinity dose not enhance plant growth once a threshold NaCl concentration in low salinity growth medium has been reached. Compensation of water uptake from the low-salt root zone and regulation of K$^{+}$/Na$^{+}$ homeostasis in low salt root play more important role than regulation of leaf ions in enhancing alfalfa growth under nonuniform salinity.
Starting Page	211
Ending Page	226
Page Count	16
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	408
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-05-20
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Medicago sativa L. Nonuniform salinity Split-root system Water uptake Predawn leaf water potential Leaf Na$^{+}$ concentration Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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