Claim · model-written summary
Plants with high carbohydrate reserves and temporary nitrate deficiency absorbed and reduced nitrate more vigorously after renewed supply than continuously nitrate-rich, carbohydrate-poor plants.
- Taxon
- pineapple
Ananas comosust0 - Treatment
- when again supplied with nitratee0
- Outcome
- absorbed and reduced ite0
- Direction
- much more vigorouslye0
- Comparator
- other plants continuously higher in nitrate and lower in carbohydratese0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants which had been allowed to accumulate a high carbohydrate reserve and to become temporarily deficient in nitrate, when again supplied with nitrate, apparently absorbed and reduced it much more vigorously than other plants continuously higher in nitrate and lower in carbohydrates”
t0“Pineapple”
Title
Nitrate and Carbohydrate Reserves in Relation to Nitrogen Nutrition of Pineapple
G. T. Nightingale Botanical Gazette 1942. doi:10.1086/335062
Other claims from this paper (15)
- Observation After blossom emergence, external nitrogen supply had essentially no influence on plant and fruit development.
- Observation White basal leaf tissue moisture changed little until storage tissue water was nearly depleted.
- Method / resource Macrochemical starch percentages failed to indicate the extent of pineapple starch reserve filling.
- Observation Yellow-green plants had starch-storing tissue filled to capacity yet a small fresh- or dry-material percentage of starch.
- Observation Black-green succulent plants contained about 25 per cent of their potential starch capacity but more absolute starch than woody plants.
- Association Greater yellow-green leaf color corresponded to higher relative starch content.
- Method / resource Relative leaf greenness provided a sufficiently precise index of carbohydrate content.
- Association Relatively low nitrate concentration reduced the efficiency or freedom of nitrate reduction.
- Observation These temporarily nitrate-deficient plants had relatively little fruit yield loss if recovery time before budding was sufficient.
- Association Prolonged nitrate reserve deficiency before flower buds lowered fruit yields relative to prompt correction.
- Intervention effect Adding nitrogen to plants low in both nitrate and carbohydrates did not materially increase yield.
- Intervention effect Some nitrogen additions apparently decreased yield.
- Association Soil temperatures of 68⚬ F. or lower may limit root nitrate absorption.
- Association In warm-minimum seasons, nitrate-deficient carbohydrate-rich plants may fruit months earlier than plants with higher nitrate and lower carbohydrates.
- Observation After cooler nights, plants with different nitrate levels may differentiate flower primordia simultaneously.