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Enhancement of nitrate uptake and growth of barley seedlings by calcium under saline conditionsThe effect of Ca2+ on NO3- assimilation in young barley (Hordeum vulgare L. var CM 72) seedlings in the presence and absence of NaCl was studied. Calcium increased the activity of the NO3- transporter under saline conditions, but had little effect under nonsaline conditions. Calcium decreased the induction period for the NO3- transporter under both saline and nonsaline conditions but had little effect on its apparent Km for NO3- both in the presence and absence of NaCl. The enhancement of NO3- transport by Ca2+ under saline conditions was dependent on the presence of Ca2+ in the uptake solution along with the salt, since Ca2+ had no effect when supplied before or after salinity stress. Although Mn2+ and Mg2+ enhanced NO3- uptake under saline conditions, neither was as effective as Ca2+. In longer studies, increasing the Ca2+ concentration in saline nutrient solutions resulted in increases in NO3- assimilation and seedling growth.
Document ID
20040089589
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ward, M. R.
(University of California Davis 95616, United States)
Aslam, M.
Huffaker, R. C.
Date Acquired
August 21, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Plant physiology
Volume: 80
Issue: 1
ISSN: 0032-0889
Subject Category
Man/System Technology And Life Support
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 61-10
NASA Program CELSS
NASA Discipline Life Support Systems
Non-NASA Center

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