Uptake and apparent utilization of urea and ammonium nitrate in wheat seedlings

D. P. Bradley; M. A. Morgan; P. O'Toole

doi:10.1007/BF01055400

Uptake and apparent utilization of urea and ammonium nitrate in wheat seedlings

D. P. Bradley
, M. A. Morgan
, P. O'Toole

University College Dublin

Research output: Contribution to journal › Article › peer-review

Abstract

Intact wheat (Triticum aestivum cv. Quern) seedlings that were grown in presence or absence of NH₄NO₃ were exposed to solutions containing CO(NH₂)₂, NH₄NO₃, CO(NH₂)₂ + NH₄NO₃, CO(NH₂)₂ + KNO₃ and CO(NH₂)₂ + (NH₄)₂SO₄ for consecutive periods of 3, 3, 6, 12 and 24h and N uptake determined by solution depletion measurements. Differences in ethanol-soluble N and ethanol-insoluble N content of roots and shoots of control (zero time) seedlings and seedlings exposed to CO(NH₂)₂, NH₄NO₃ and CO(NH₂)₂ + NH₄NO₃ for 48 h were used to characterize N utilization during/following uptake. Regardless of initial N status, uptake of N from CO(NH₂)₂ was less than one-third of that from NH₄NO₃. Relative absorption of the CO(NH₂)₂ and NH₄NO₃ was not substantially altered by acidity control of the uptake solutions. There was a reciprocal antagonism between uptake of CO(NH₂)₂ and uptake of NH₄NO₃. Whereas CO(NH₂)₂ inhibited NH₄ absorption in each set of seedlings, it decreased NO₃ uptake only in seedlings that had been pretreated with N. Simultaneous presence of KNO₃ enhanced CO(NH₂)₂ uptake but presence of (NH₄)₂SO₄ decreased it to the same extent as NH₄NO₃. All absorption processes involving CO(NH₂)₂ and NH₄ were substantially restricted by pretreatment of the seedlings with NH₄NO₃. The results suggest that apparent utilization of ambient N was dependent on initial N status of the seedlings and on the nature of the N species to which they were exposed.

Original language	English
Pages (from-to)	41-49
Number of pages	9
Journal	Fertilizer Research
Volume	20
Issue number	1
DOIs	https://doi.org/10.1007/BF01055400
Publication status	Published - Aug 1989
Externally published	Yes

Keywords

CO(NH) assimilation
CO(NH) uptake
N-deprivation
N-source interactions
NHNO uptake

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10.1007/BF01055400

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title = "Uptake and apparent utilization of urea and ammonium nitrate in wheat seedlings",

abstract = "Intact wheat (Triticum aestivum cv. Quern) seedlings that were grown in presence or absence of NH4NO3 were exposed to solutions containing CO(NH2)2, NH4NO3, CO(NH2)2 + NH4NO3, CO(NH2)2 + KNO3 and CO(NH2)2 + (NH4)2SO4 for consecutive periods of 3, 3, 6, 12 and 24h and N uptake determined by solution depletion measurements. Differences in ethanol-soluble N and ethanol-insoluble N content of roots and shoots of control (zero time) seedlings and seedlings exposed to CO(NH2)2, NH4NO3 and CO(NH2)2 + NH4NO3 for 48 h were used to characterize N utilization during/following uptake. Regardless of initial N status, uptake of N from CO(NH2)2 was less than one-third of that from NH4NO3. Relative absorption of the CO(NH2)2 and NH4NO3 was not substantially altered by acidity control of the uptake solutions. There was a reciprocal antagonism between uptake of CO(NH2)2 and uptake of NH4NO3. Whereas CO(NH2)2 inhibited NH4 absorption in each set of seedlings, it decreased NO3 uptake only in seedlings that had been pretreated with N. Simultaneous presence of KNO3 enhanced CO(NH2)2 uptake but presence of (NH4)2SO4 decreased it to the same extent as NH4NO3. All absorption processes involving CO(NH2)2 and NH4 were substantially restricted by pretreatment of the seedlings with NH4NO3. The results suggest that apparent utilization of ambient N was dependent on initial N status of the seedlings and on the nature of the N species to which they were exposed.",

keywords = "CO(NH) assimilation, CO(NH) uptake, N-deprivation, N-source interactions, NHNO uptake",

author = "Bradley, \{D. P.\} and Morgan, \{M. A.\} and P. O'Toole",

year = "1989",

month = aug,

doi = "10.1007/BF01055400",

language = "English",

volume = "20",

pages = "41--49",

journal = "Fertilizer Research",

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TY - JOUR

T1 - Uptake and apparent utilization of urea and ammonium nitrate in wheat seedlings

AU - Bradley, D. P.

AU - Morgan, M. A.

AU - O'Toole, P.

PY - 1989/8

Y1 - 1989/8

N2 - Intact wheat (Triticum aestivum cv. Quern) seedlings that were grown in presence or absence of NH4NO3 were exposed to solutions containing CO(NH2)2, NH4NO3, CO(NH2)2 + NH4NO3, CO(NH2)2 + KNO3 and CO(NH2)2 + (NH4)2SO4 for consecutive periods of 3, 3, 6, 12 and 24h and N uptake determined by solution depletion measurements. Differences in ethanol-soluble N and ethanol-insoluble N content of roots and shoots of control (zero time) seedlings and seedlings exposed to CO(NH2)2, NH4NO3 and CO(NH2)2 + NH4NO3 for 48 h were used to characterize N utilization during/following uptake. Regardless of initial N status, uptake of N from CO(NH2)2 was less than one-third of that from NH4NO3. Relative absorption of the CO(NH2)2 and NH4NO3 was not substantially altered by acidity control of the uptake solutions. There was a reciprocal antagonism between uptake of CO(NH2)2 and uptake of NH4NO3. Whereas CO(NH2)2 inhibited NH4 absorption in each set of seedlings, it decreased NO3 uptake only in seedlings that had been pretreated with N. Simultaneous presence of KNO3 enhanced CO(NH2)2 uptake but presence of (NH4)2SO4 decreased it to the same extent as NH4NO3. All absorption processes involving CO(NH2)2 and NH4 were substantially restricted by pretreatment of the seedlings with NH4NO3. The results suggest that apparent utilization of ambient N was dependent on initial N status of the seedlings and on the nature of the N species to which they were exposed.

AB - Intact wheat (Triticum aestivum cv. Quern) seedlings that were grown in presence or absence of NH4NO3 were exposed to solutions containing CO(NH2)2, NH4NO3, CO(NH2)2 + NH4NO3, CO(NH2)2 + KNO3 and CO(NH2)2 + (NH4)2SO4 for consecutive periods of 3, 3, 6, 12 and 24h and N uptake determined by solution depletion measurements. Differences in ethanol-soluble N and ethanol-insoluble N content of roots and shoots of control (zero time) seedlings and seedlings exposed to CO(NH2)2, NH4NO3 and CO(NH2)2 + NH4NO3 for 48 h were used to characterize N utilization during/following uptake. Regardless of initial N status, uptake of N from CO(NH2)2 was less than one-third of that from NH4NO3. Relative absorption of the CO(NH2)2 and NH4NO3 was not substantially altered by acidity control of the uptake solutions. There was a reciprocal antagonism between uptake of CO(NH2)2 and uptake of NH4NO3. Whereas CO(NH2)2 inhibited NH4 absorption in each set of seedlings, it decreased NO3 uptake only in seedlings that had been pretreated with N. Simultaneous presence of KNO3 enhanced CO(NH2)2 uptake but presence of (NH4)2SO4 decreased it to the same extent as NH4NO3. All absorption processes involving CO(NH2)2 and NH4 were substantially restricted by pretreatment of the seedlings with NH4NO3. The results suggest that apparent utilization of ambient N was dependent on initial N status of the seedlings and on the nature of the N species to which they were exposed.

KW - CO(NH) assimilation

KW - CO(NH) uptake

KW - N-deprivation

KW - N-source interactions

KW - NHNO uptake

UR - https://www.scopus.com/pages/publications/0012452344

U2 - 10.1007/BF01055400

DO - 10.1007/BF01055400

M3 - Article

AN - SCOPUS:0012452344

SN - 0167-1731

VL - 20

SP - 41

EP - 49

JO - Fertilizer Research

JF - Fertilizer Research

IS - 1

ER -

Uptake and apparent utilization of urea and ammonium nitrate in wheat seedlings

Abstract

Keywords

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