Abstract
Abstract There are many reports in which a relationship between P deficiency and acid phosphatase activity (APA) have been found, but, as responses to stress are an integral part of plant growth and metabolism not only enzyme activity but also the appearance of morphological and physiological indicators associated with P stress have to be examined. To this aim, bean, cowpea, pigeonpea, and cotton plants were grown from seed in pots with sand irrigated with nutrient solutions containing 0.01, 1.0, and 0 mM P. Three plants from each we re harvested at different ages and growth and APA determined using i) intact roots, ii) root extracts, and iii) discs from young and mature leaves. APA was measured with p‐Nitrophenylphosphate 5 mM in Na‐acetate buffer 50 mM pH 5 at 30°C. Results showed that NaCl when added to the extracting solution for intact roots, was detrimental to cotton but not to pigeonpea and cowpea and to a lesser extent to bean plants. APA when expressed on a root fresh weight basis decreased with age. Higher activities in intact roots were found for 21‐day‐Old pigeonpea plants grown in 0 and 0.01 mM P. In leaf discs, APA was different among species and P‐treatments, but higher in cowpea leaves. Even though a clear relationship between APA and P‐deficiency was not found, a decrease in leaf area production, increased root/total dry weight ratios and decreased shoot/root ratios were observed. Proper timing for the onset of the P‐stress threshold is apparently crucial for induction of APA in different species.
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Claims 13
Claim · model-written summary
NaCl in the intact-root extraction solution was detrimental to cotton.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- intact rootse0
- Treatment
- NaCle0
- Outcome
- detrimentale0
- Direction
- detrimentale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl when added to the extracting solution for intact roots, was detrimental to cotton but not to pigeonpea and cowpea and to a lesser extent to bean plants”
Claim · model-written summary
NaCl in the intact-root extraction solution was not detrimental to pigeonpea.
- Taxon
- pigeonpea
Cajanus cajane0 - Organ / stage
- intact rootse0
- Treatment
- NaCle0
- Outcome
- detrimentale0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl when added to the extracting solution for intact roots, was detrimental to cotton but not to pigeonpea and cowpea and to a lesser extent to bean plants”
Claim · model-written summary
NaCl in the intact-root extraction solution was not detrimental to cowpea.
- Taxon
- cowpea
Vigna unguiculatae0 - Organ / stage
- intact rootse0
- Treatment
- NaCle0
- Outcome
- detrimentale0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl when added to the extracting solution for intact roots, was detrimental to cotton but not to pigeonpea and cowpea and to a lesser extent to bean plants”
Claim · model-written summary
NaCl in the intact-root extraction solution was detrimental to bean to a lesser extent.
- Taxon
- beane0
- Organ / stage
- intact rootse0
- Treatment
- NaCle0
- Outcome
- detrimentale0
- Direction
- to a lesser extente0
Not reportedComparator
Verbatim
e0“NaCl when added to the extracting solution for intact roots, was detrimental to cotton but not to pigeonpea and cowpea and to a lesser extent to bean plants”
Claim · model-written summary
Root fresh weight based acid phosphatase activity decreased with plant age.
Not reportedTaxon
Verbatim
e0“APA when expressed on a root fresh weight basis decreased with age”
Claim · model-written summary
Intact roots of 21-day-old pigeonpea at 0 and 0.01 mM P had higher acid phosphatase activity.
- Taxon
- pigeonpeaCajanus cajane0
- Organ / stage
- intact rootse0
- Treatment
- 0 and 0.01 mM Pe0
- Outcome
- activitiese0
- Direction
- Highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher activities in intact roots were found for 21‐day‐Old pigeonpea plants grown in 0 and 0.01 mM P”
Claim · model-written summary
Leaf-disc acid phosphatase activity differed among species and phosphorus treatments.
Not reportedTaxon
Verbatim
e0“In leaf discs, APA was different among species and P‐treatments, but higher in cowpea leaves”
Claim · model-written summary
Cowpea leaves had higher acid phosphatase activity.
- Taxon
- cowpeaVigna unguiculatae0
- Organ / stage
- leavese0
- Outcome
- APAe0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In leaf discs, APA was different among species and P‐treatments, but higher in cowpea leaves”
Claim · model-written summary
The study found no clear relationship between acid phosphatase activity and phosphorus deficiency.
Not reportedTaxon
Verbatim
e0“a clear relationship between APA and P‐deficiency was not found”
Claim · model-written summary
Leaf area production decreased under phosphorus stress.
Not reportedTaxon
Verbatim
e0“a decrease in leaf area production, increased root/total dry weight ratios and decreased shoot/root ratios were observed”
Claim · model-written summary
Root to total dry weight ratios increased under phosphorus stress.
Not reportedTaxon
Verbatim
e0“a decrease in leaf area production, increased root/total dry weight ratios and decreased shoot/root ratios were observed”
Claim · model-written summary
Shoot to root ratios decreased under phosphorus stress.
Not reportedTaxon
Verbatim
e0“a decrease in leaf area production, increased root/total dry weight ratios and decreased shoot/root ratios were observed”
Claim · model-written summary
Timing of the phosphorus stress threshold appears crucial for inducing acid phosphatase activity across species.
Not reportedTaxon
Verbatim
e0“Proper timing for the onset of the P‐stress threshold is apparently crucial for induction of APA in different species”