Abstract
A series of experiments was conducted to investigate the response to drought stress of marigold ( Tagetes patula L. `Janie Tangerine') plants grown with reduced phosphorus. Plants were grown with convention al phosphorus fertilization (1 m m , control) or one of two levels of alumina-buffered phosphorus (Al-P), 21 or 5 μ m . Plants supplied with 21 μ m Al-P produced plants with equal total dry weight, more flowers and reduced leaf area compared to control plants. Whole-plant photosynthetic CO 2 assimilation expressed on a leaf area basis was nearly twice as high in 21 μ m Al-P plants as in controls, probably as a result of reduced intraplant shading. In plants supplied with 21 μ m Al-P, smaller leaf area resulted in reduced whole-plant transpiration. Moreover, the relative water content of the growing medium was significantly lower at wilting with 21 μ m Al-P than for control or 5 μ m Al-P regimes. The improved water acquisition with 21 μ m Al-P could be explained by increased root proliferation via longer main roots and less densely distributed lateral roots. The results indicate that optimizing phosphorus nutrition with solid-phase buffered-phosphorus fertilizer improves drought tolerance by reducing transpiration and increasing water acquisition from the medium.
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Claims 8
Claim · model-written summary
At 21 μ m Al-P, marigold total dry weight equaled the control.
Verbatim
e0“Plants supplied with 21 μ m Al-P produced plants with equal total dry weight, more flowers and reduced leaf area compared to control plants”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, marigold produced more flowers than controls.
Verbatim
e0“Plants supplied with 21 μ m Al-P produced plants with equal total dry weight, more flowers and reduced leaf area compared to control plants”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, marigold leaf area was lower than controls.
Verbatim
e0“Plants supplied with 21 μ m Al-P produced plants with equal total dry weight, more flowers and reduced leaf area compared to control plants”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, leaf-area-based whole-plant CO 2 assimilation was nearly twice the control.
Verbatim
e0“Whole-plant photosynthetic CO 2 assimilation expressed on a leaf area basis was nearly twice as high in 21 μ m Al-P plants as in controls”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, marigold whole-plant transpiration was reduced.
Not reportedComparator
Verbatim
e0“In plants supplied with 21 μ m Al-P, smaller leaf area resulted in reduced whole-plant transpiration”
t0“Marigold”
Claim · model-written summary
At wilting, growing-medium relative water content was significantly lower with 21 μ m Al-P than with control or 5 μ m Al-P.
Verbatim
e0“the relative water content of the growing medium was significantly lower at wilting with 21 μ m Al-P than for control or 5 μ m Al-P regimes”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, marigold had longer main roots.
Not reportedTreatmentComparator
Verbatim
e0“increased root proliferation via longer main roots and less densely distributed lateral roots”
t0“Marigold”
Claim · model-written summary
At 21 μ m Al-P, marigold lateral roots were less densely distributed.
Not reportedTreatmentComparator
Verbatim
e0“increased root proliferation via longer main roots and less densely distributed lateral roots”
t0“Marigold”
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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.