Abstract
ABSTRACT This study was conducted to evaluate the effect of nitrogen (N) and potassium (K) availability on root exudate composition of two sugarcane cultivars known to differ with regard to their resistance to drought and salinity stress. The plants were hydroponically grown in a greenhouse and subjected to three levels of N (0.1, 1.0, and 10 mM N) and three levels of K (0.02, 0.2, and 2 mM K). Nitrogen and K stress altered the xylem sap composition. Nitrogen stress significantly reduced nitrate (NO3 −), ammonium (NH4 +), calcium (Ca), magnesium (Mg), and amino acid content and increased the pH, phosphorus (P), and K content. Whereas, K stress significantly decreased pH, K, NH4 +, and amino acid content but increased Ca, Mg, and P content. Nitrogen and K stress had opposing effects on xylem sap pH and osmolality. Results indicated that sugarcane plants recycle compounds between the phloem and xylem. The results also suggested that the NO3 − and K concentration of xylem sap could be effectively used to estimate the N and K status of the soil solution. Keywords: amino acidsnitratepHpotassiumstresssugarcanexylem sap composition Acknowledgements The author thanks the Food and Agriculture Organization of the United Nation for financial support, Dr. Frederick C. Meinzer for invaluable guidance and reviewing, and Hawaii Agricultural Research Center for providing glasshouse and laboratory facilities.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Nitrogen stress reduced xylem sap nitrate, ammonium and calcium.
- Taxon
- Sugarcanet0
- Treatment
- Nitrogen stresse0
- Outcome
- nitrate (NO3 −), ammonium (NH4 +), calcium (Ca)e0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Nitrogen stress significantly reduced nitrate (NO3 −), ammonium (NH4 +), calcium (Ca)”
t0“Sugarcane”
Claim · model-written summary
Nitrogen stress reduced xylem sap magnesium and amino acid content.
- Taxon
- Sugarcanet0
- Treatment
- Nitrogen stresse1
- Outcome
- magnesium (Mg), and amino acid contente0
- Direction
- reducede1
Not reportedComparator
Verbatim
e0“magnesium (Mg), and amino acid content”
e1“Nitrogen stress significantly reduced”
t0“Sugarcane”
Claim · model-written summary
Nitrogen stress increased xylem sap pH, phosphorus and potassium content.
- Taxon
- Sugarcanet0
- Treatment
- Nitrogen stresse1
- Outcome
- pH, phosphorus (P), and K contente0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased the pH, phosphorus (P), and K content”
e1“Nitrogen stress significantly reduced”
t0“Sugarcane”
Claim · model-written summary
Potassium stress decreased xylem sap pH, potassium and ammonium.
Not reportedComparator
Verbatim
e0“K stress significantly decreased pH, K, NH4 +”
t0“Sugarcane”
Claim · model-written summary
Potassium stress decreased xylem sap amino acid content.
Not reportedComparator
Verbatim
e0“and amino acid content but increased Ca”
e1“K stress significantly decreased”
t0“Sugarcane”
Claim · model-written summary
Potassium stress increased calcium, magnesium and phosphorus content.
Not reportedComparator
Verbatim
e0“increased Ca, Mg, and P content”
e1“K stress significantly decreased”
t0“Sugarcane”
Claim · model-written summary
Nitrogen and potassium stress had opposing effects on sap pH and osmolality.
Verbatim
e0“Nitrogen and K stress had opposing effects on xylem sap pH and osmolality.”
t0“Sugarcane”
Claim · model-written summary
Sugarcane appears to recycle compounds between phloem and xylem.
Verbatim
e0“sugarcane plants recycle compounds between the phloem and xylem”
Claim · model-written summary
Sap nitrate and potassium concentration may estimate nitrogen and potassium status of soil solution.
Not reportedComparatorValue
Verbatim
e0“the NO3 − and K concentration of xylem sap could be effectively used to estimate the N and K status of the soil solution”
t0“Sugarcane”
The same questions in other papers
nitrogen · molecular: metabolites · Saccharum officinarum (sugarcane)Positive and negative results
10 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
17 papers more in this group
See all 21 papers →nitrogen · nutrient: content · Saccharum officinarum (sugarcane)Positive and negative results
7 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
27 papers more in this group
See all 31 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.