NDLI: Growth and solute composition of the salt-tolerant kallar grass [Leptochloa fusca (L.) Kunth] as affected by nitrogen source

Content Provider	Springer Nature Link
Author	Mahmood, Tariq Kaiser, Werner M.
Copyright Year	2003
Abstract	A study was conducted to elucidate the effect of N form, either NH$_{4}$ $^{+}$ or NO$_{3}$ $^{−}$, on growth and solute composition of the salt-tolerant kallar grass [Leptochloa fusca (L.) Kunth] grown under 10 mM or 100 mM NaCl in hydroponics. Shoot biomass was not affected by N form, whereas NH$_{4}$ $^{+}$ compared to NO$_{3}$ $^{−}$ nutrition caused an almost 4-fold reduction in the root biomass at both salinity levels. Under NH$_{4}$ $^{+}$ nutrition, salinity had no effect on the biomass yield, whereas under NO$_{3}$ $^{−}$ nutrition, increasing salinity from 10 mM to 100 mM caused 23% and 36% reduction in the root and shoot biomass, respectively. The reduced root growth under NH$_{4}$ $^{+}$ nutrition was not attributable to impaired shoot to root C allocation since N form did not affect the overall root sugar concentration and the starch concentration was even higher under NH$_{4}$ $^{+}$ compared to NO$_{3}$ $^{−}$ nutrition. The low NH$_{4}$ $^{+}$ (≤2 mM) and generally higher amino-N concentrations in NH$_{4}$ $^{+}$- compared to NO$_{3}$ $^{−}$-fed plants indicated that the grass was able to effectively detoxify NH$_{4}$ $^{+}$. Salinity had no effect on Ca$^{2+}$ and Mg$^{2+}$ levels, whereas their concentration in shoots was lower under NH$_{4}$ $^{+}$ compared to NO$_{3}$ $^{−}$ nutrition (over 66% reduction in Ca$^{2+}$; over 20% reduction in Mg$^{2+}$), but without showing deficiency symptoms. Ammonium compared to NO$_{3}$ $^{−}$ nutrition did not inhibit K$^{+}$ uptake, and the K$^{+}$-Na$^{+}$ selectivity either remained unaffected or it was higher under NH$_{4}$ $^{+}$ than under NO$_{3}$ $^{−}$ nutrition. Results suggested that while NH$_{4}$ $^{+}$ versus NO$_{3}$ $^{−}$ nutrition substantially reduced root growth, and also strongly modified anion concentrations and to a minor extent concentrations of divalent cations in shoots, it did not influence salt tolerance of kallar grass.
Starting Page	359
Ending Page	366
Page Count	8
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	252
Issue Number	2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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