Abstract
SUMMARY Vegetative soybean plants were exposed to root temperatures of 18, 24, and 30 °C in each of three aerial environments varying in light and CO 2 . Under high light (700 mUE m ‐2 s ‐1 ) at ambient CO 2 (400 mUl l ‐1 ) nitrate absorption and root growth were less at 18 and 30°C than 24°C. Both nitrate absorption and root growth were more sensitive to increasing root temperature under low light (325 μE m ‐2 s ‐1 ) and less sensitive under enriched CO 2 (1000 μl l ‐1 ). As indicated by dry matter accumulation, net flux of photosynthate to the roots was correlated with the changes in aerial environment. It was concluded from these relationships that the variation in root growth and nitrate uptake resulted from altered utilization of carbohydrates in the roots and that altered utilization of carbohydrates with increasing root temperature resulted from disproportionate partitioning of carbohydrate among root functions. Although differences occurred in the amount of nitrogen translocated out of the root, nitrogen accumulation in the shoot was primarily a function of nitrate absorbed. Restrictions in dry matter accumulation in the shoot were similar to restrictions observed in the root. A decrease in emergence of new leaves was often the first response observed, with decreases in leaf area and dry wt occurring later. The integrated plant response to moderate root temperature stress is interpreted as evidence for an interdependent plant system, predominantly regulated by carbohydrate flux to the root and nitrogen flux to the shoot.
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Claims 8
Claim · model-written summary
Nitrate absorption and root growth were less at 18 and 30°C than at 24°C under high light
- Taxon
- soybean
Glycine maxt0 - Treatment
- 18 and 30°Ce1
- Outcome
- nitrate absorption and root growthe1
- Direction
- lesse1
- Comparator
- 24°Ce1
- Setting
- high lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e1“Under high light (700 mUE m ‐2 s ‐1 ) at ambient CO 2 (400 mUl l ‐1 ) nitrate absorption and root growth were less at 18 and 30°C than 24°C”
Claim · model-written summary
Nitrate absorption and root growth were more sensitive to increasing root temperature under low light
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing root temperaturee2
- Outcome
- sensitive to increasing root temperaturee2
- Direction
- moree2
- Setting
- low lighte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e2“Both nitrate absorption and root growth were more sensitive to increasing root temperature under low light”
Claim · model-written summary
Nitrate absorption and root growth were less sensitive to increasing root temperature under enriched CO2
- Taxon
- soybeanGlycine maxt0
- Treatment
- enriched CO 2e2
- Outcome
- less sensitivee2
- Direction
- lesse2
- Setting
- enriched CO 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e2“and less sensitive under enriched CO 2”
Claim · model-written summary
Net flux of photosynthate to the roots was correlated with changes in the aerial environment
- Taxon
- soybeanGlycine maxt0
- Treatment
- changes in aerial environmente3
- Outcome
- net flux of photosynthate to the rootse3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e3“As indicated by dry matter accumulation, net flux of photosynthate to the roots was correlated with the changes in aerial environment”
Claim · model-written summary
Nitrogen accumulation in the shoot was primarily a function of nitrate absorbed
- Taxon
- soybeanGlycine maxt0
- Treatment
- nitrate absorbede4
- Outcome
- nitrogen accumulation in the shoote4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e4“nitrogen accumulation in the shoot was primarily a function of nitrate absorbed”
Claim · model-written summary
Under moderate root temperature stress, emergence of new leaves decreased first
- Taxon
- soybeanGlycine maxt0
- Treatment
- moderate root temperature stresse6
- Outcome
- emergence of new leavese5
- Direction
- decreasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e5“A decrease in emergence of new leaves was often the first response observed, with decreases in leaf area and dry wt occurring later”
e6“The integrated plant response to moderate root temperature stress is interpreted as evidence for an interdependent plant system”
Claim · model-written summary
Under moderate root temperature stress, leaf area and dry weight decreased later
- Taxon
- soybeanGlycine maxt0
- Treatment
- moderate root temperature stresse6
- Outcome
- leaf area and dry wte5
- Direction
- decreasese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e5“A decrease in emergence of new leaves was often the first response observed, with decreases in leaf area and dry wt occurring later”
e6“The integrated plant response to moderate root temperature stress is interpreted as evidence for an interdependent plant system”
Claim · model-written summary
The whole-plant response to root temperature stress is regulated by carbohydrate flux to the root and nitrogen flux to the shoot
- Taxon
- soybeanGlycine maxt0
- Outcome
- integrated plant responsee6
- Qualifier
- predominantly regulated by carbohydrate flux to the root and nitrogen flux to the shoote6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“NITROGEN ASSIMILATION, ROOT GROWTH AND WHOLE PLANT RESPONSES OF SOYBEAN TO ROOT TEMPERATURE”
e6“The integrated plant response to moderate root temperature stress is interpreted as evidence for an interdependent plant system, predominantly regulated by carbohydrate flux to the root and nitrogen flux to the shoot”