Abstract
Abstract We examined if higher plant water use efficiency is related to a higher investment of nitrogen in components of the photosynthetic apparatus and if this is associated with a less efficient use of nitrogen for photosynthesis or for growth. We also assessed the influence of a reduced supply of water and nitrogen on these relationships. For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency. Differences in leaf water use efficiency (A/E) between cultivars or treatments were associated with differences in Rubisco activity or rate of electron transport and, in general, with differences in plant water use efficiency. They were not invariably related to a low photosynthetic nitrogen use efficiency (PNUE). A high A/E was associated with a low PNUE, e.g. when we compared cultivars at high irradiance. In this case, a high A/E and a high leaf nitrogen concentration were associated with a low stornatal conductance and an equal rate of photosynthesis. A high A/E was not associated with a low PNUE when differences in A/E were mainly caused by higher rates of photosynthesis associated with higher nitrogen concentrations, e.g. when we compared cultivars at low irradiance and high water and nitrogen supply. An increase in the proportion of total leaf nitrogen associated with the photosynthetic apparatus at low soil-nitrogen increased PNUE, without affecting A/E in the opposite way. We conclude that whole plant nitrogen use efficiency was low for the cultivars with a high plant water use efficiency.
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Claims 6
Claim · model-written summary
Leaf water use efficiency differences between wheat cultivars or treatments were associated with Rubisco activity or electron transport rate.
- Taxon
- Triticum aestivum
Triticum aestivume0 - Material
- cultivarse1
- Outcome
- leaf water use efficiency (A/E)e1
- Qualifier
- Rubisco activity or rate of electron transporte1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e1“Differences in leaf water use efficiency (A/E) between cultivars or treatments were associated with differences in Rubisco activity or rate of electron transport and, in general, with differences in plant water use efficiency”
Claim · model-written summary
A high leaf water use efficiency was associated with a low photosynthetic nitrogen use efficiency when wheat cultivars were compared at high irradiance.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- cultivarse2
- Treatment
- high irradiancee2
- Outcome
- PNUEe2
- Direction
- lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e2“A high A/E was associated with a low PNUE, e.g. when we compared cultivars at high irradiance”
Claim · model-written summary
A high leaf water use efficiency was not associated with a low photosynthetic nitrogen use efficiency when it resulted from higher photosynthesis at low irradiance with high water and nitrogen supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- cultivarse3
- Treatment
- low irradiance and high water and nitrogen supplye3
- Outcome
- PNUEe3
- Direction
- not associated with a lowe3
- Qualifier
- differences in A/E were mainly caused by higher rates of photosynthesise3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e3“A high A/E was not associated with a low PNUE when differences in A/E were mainly caused by higher rates of photosynthesis associated with higher nitrogen concentrations, e.g. when we compared cultivars at low irradiance and high water and nitrogen supply”
Claim · model-written summary
Increasing the proportion of total leaf nitrogen in the photosynthetic apparatus under low soil nitrogen increased photosynthetic nitrogen use efficiency.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- low soil-nitrogene4
- Compound
- total leaf nitrogene4
- Outcome
- PNUEe4
- Direction
- increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e4“An increase in the proportion of total leaf nitrogen associated with the photosynthetic apparatus at low soil-nitrogen increased PNUE, without affecting A/E in the opposite way”
Claim · model-written summary
Under low soil nitrogen, the proportion of leaf nitrogen in the photosynthetic apparatus did not affect leaf water use efficiency.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- low soil-nitrogene4
- Compound
- total leaf nitrogene4
- Outcome
- A/Ee4
- Direction
- without affectinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e4“An increase in the proportion of total leaf nitrogen associated with the photosynthetic apparatus at low soil-nitrogen increased PNUE, without affecting A/E in the opposite way”
Claim · model-written summary
Whole plant nitrogen use efficiency was low in wheat cultivars with high whole plant water use efficiency.
- Taxon
- Triticum aestivumTriticum aestivume0
- Material
- cultivarse5
- Outcome
- whole plant nitrogen use efficiencye5
- Direction
- was lowe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this purpose we used two Triticum aestivum cultivars, differing in whole plant water use efficiency”
e5“We conclude that whole plant nitrogen use efficiency was low for the cultivars with a high plant water use efficiency”