Abstract
The effects of elevated UV-B (280-315nm) were assessed on nitrogen metabolism, carbohydrate pool, total phenolics, photosynthetic pigments, UV-B absorbing compounds, variables related to oxidative stress, biomass and yield of pea plants grown under various levels of NPK. The NPK levels assayed were: background NPK level (F0); recommended NPK (F1) and recommended NK+1.5×recommended P (F2) and the UV-B levels were: control (C) and elevated (T). The responses of T plants varied with different combinations of NPK. Yield reduced under elevated UV-B at all NPK levels with maximum reduction in F0T and minimum reduction in F1T. Leghaemoglobin content was reduced under elevated UV-B at all NPK levels. Maximum increase in malondialdehyde content recorded in F0T plants corresponded with higher superoxide and hydrogen peroxide contents. Nitrite reductase activity decreased significantly under UV-B at all NPK levels, but nitrate reductase activity increased significantly in F1T and F2T. Maximum reduction in C:N ratio of leaves in F2T plants suggests competition between sucrose synthesis and nitrate reduction under additional P level. The study concludes that application of recommended level of NPK caused least changes in N metabolism leading to minimum yield losses due to elevated UV-B stress.
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Claims 8
Claim · model-written summary
Elevated UV-B reduced pea yield at all NPK levels, with the largest reduction at background NPK.
- Taxon
- pea plants
Lathyrus oleraceuse0 - Treatment
- elevated UV-Be1
- Outcome
- Yielde1
- Direction
- reducede1
- Qualifier
- maximum reduction in F0T and minimum reduction in F1Te1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Yield reduced under elevated UV-B at all NPK levels with maximum reduction in F0T and minimum reduction in F1T”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Elevated UV-B reduced leghaemoglobin content at all NPK levels.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- elevated UV-Be2
- Outcome
- Leghaemoglobin contente2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Leghaemoglobin content was reduced under elevated UV-B at all NPK levels”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Elevated UV-B increased malondialdehyde content in F0T plants.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- elevated UV-Be1
- Outcome
- malondialdehyde contente3
- Direction
- increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Maximum increase in malondialdehyde content recorded in F0T plants corresponded with higher superoxide and hydrogen peroxide contents”
e1“Yield reduced under elevated UV-B at all NPK levels”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Superoxide and hydrogen peroxide contents were higher in F0T plants where malondialdehyde increased most.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- F0T plantse3
- Outcome
- superoxide and hydrogen peroxide contentse3
- Direction
- highere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Maximum increase in malondialdehyde content recorded in F0T plants corresponded with higher superoxide and hydrogen peroxide contents”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Elevated UV-B decreased nitrite reductase activity at all NPK levels.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- UV-Be4
- Outcome
- Nitrite reductase activitye4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Nitrite reductase activity decreased significantly under UV-B at all NPK levels”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Elevated UV-B increased nitrate reductase activity in F1T and F2T.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- UV-Be4
- Outcome
- nitrate reductase activitye5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“nitrate reductase activity increased significantly in F1T and F2T”
e4“Nitrite reductase activity decreased significantly under UV-B at all NPK levels”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
The C:N ratio of leaves showed the largest reduction in F2T plants.
- Taxon
- pea plantsLathyrus oleraceuse0
- Treatment
- additional P levele5
- Outcome
- C:N ratio of leavese5
- Direction
- Maximum reductione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Maximum reduction in C:N ratio of leaves in F2T plants suggests competition between sucrose synthesis and nitrate reduction under additional P level”
e0“biomass and yield of pea plants grown under various levels of NPK”
Claim · model-written summary
Recommended NPK caused the least change in N metabolism and minimum yield losses under elevated UV-B.
- Taxon
- pea plantsLathyrus oleraceuse0
- Outcome
- minimum yield lossese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“application of recommended level of NPK caused least changes in N metabolism leading to minimum yield losses due to elevated UV-B stress”
e0“biomass and yield of pea plants grown under various levels of NPK”
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See all 8 papers →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.