Abstract
• Drought stress decreased tea quality, N translocation and uptake rates, but increased water use efficiency. • Nano-selenium foliar application alleviated drought stress, enhanced N translocation and uptake rates. • Nano-selenium foliar application increased the leaf Se content, the levels of soluble sugars, amino acids and tea polyphenols. Tea plant ( Camellia sinensis (L.) O. Kuntze) is an important economic crop and frequently exposed to drought stress. However, there is still limited understanding of how drought stress affects nitrogen uptake and amino acid accumulation in tea plants, which are key indicators of both growth and nutritional quality. In this study, we explored the growth and physiological traits, and tea quality of three tea cultivars (‘Longjing 43’, ‘Fuding Dabaicha’, ‘Zhenong 117’) under nano-Se application, drought stress and their interactions. In addition, 15 NH 4 NO 3 and NH 4 15 NO 3 were used to identify the different forms of nitrogen uptake and translocation rates. We found that drought stress decreased growth and biomass, net photosynthetic rate ( A ), photosynthetic nitrogen use efficiency (PNUE), tea quality (amino acids and tea polyphenols), N translocation and uptake rates, but increased water use efficiency (WUE) and oxidative stress. The nano-Se application alleviated drought stress, which increased leaf biomass and total biomass, A , WUE and PNUE in the three tea cultivars, especially under drought stress. In addition, ‘Longjing 43’ had the highest stem biomass and total biomass, A and WUE under combined nano-Se application and drought stress. Furthermore, nano-Se application significantly increased the leaf Se and leaf N contents, the levels of soluble sugars, amino acids and tea polyphenols, and ‘Longjing 43’ had the highest leaf Se and amino acid contents under nano-Se application. We concluded that under nano-Se application, ‘Longjing 43’ improves more as a higher stem biomass and total biomass, A and WUE, leaf Se and amino acid contents, and higher N translocation and uptake rates when suffered drought stress. This is helpful for tea management under future climate change with increasing drought.
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Claims 12
Claim · model-written summary
Drought reduced tea growth and biomass.
Not reportedComparator
Verbatim
e0“drought stress decreased growth and biomass”
e1“Tea plant”
Claim · model-written summary
Drought reduced net photosynthetic rate and photosynthetic nitrogen use efficiency.
- Taxon
- Tea plante1
- Treatment
- drought stresse0
- Outcome
- net photosynthetic rate ( A ), photosynthetic nitrogen use efficiency (PNUE)e0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“drought stress decreased growth and biomass, net photosynthetic rate ( A ), photosynthetic nitrogen use efficiency (PNUE)”
e1“Tea plant”
Claim · model-written summary
Drought reduced tea amino acids and polyphenols.
- Taxon
- Tea plante2
- Treatment
- drought stresse1
- Outcome
- tea quality (amino acids and tea polyphenols)e0
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“tea quality (amino acids and tea polyphenols), N translocation and uptake rates”
e1“drought stress decreased”
e2“Tea plant”
Claim · model-written summary
Drought reduced nitrogen translocation and uptake rates.
- Taxon
- Tea plante2
- Treatment
- drought stresse1
- Outcome
- N translocation and uptake ratese0
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“tea quality (amino acids and tea polyphenols), N translocation and uptake rates”
e1“drought stress decreased”
e2“Tea plant”
Claim · model-written summary
Drought increased water use efficiency and oxidative stress.
- Taxon
- Tea plante2
- Treatment
- drought stresse1
- Outcome
- water use efficiency (WUE) and oxidative stresse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased water use efficiency (WUE) and oxidative stress”
e1“We found that drought stress decreased”
e2“Tea plant”
Claim · model-written summary
Nano-Se increased leaf and total biomass in the three tea cultivars, especially under drought.
- Taxon
- Tea plante2
- Treatment
- nano-Se applicatione0
- Outcome
- leaf biomass and total biomasse0
- Direction
- increasede0
- Qualifier
- especially under drought stresse1
Not reportedComparator
Verbatim
e0“nano-Se application alleviated drought stress, which increased leaf biomass and total biomass”
e1“in the three tea cultivars, especially under drought stress”
e2“Tea plant”
Claim · model-written summary
Nano-Se increased photosynthetic rate, water use efficiency and photosynthetic nitrogen use efficiency.
Not reportedComparator
Verbatim
e0“A , WUE and PNUE in the three tea cultivars, especially under drought stress”
e1“nano-Se application alleviated drought stress, which increased”
e2“Tea plant”
Claim · model-written summary
Longjing 43 had the highest stem and total biomass under nano-Se and drought.
Verbatim
e0“‘Longjing 43’ had the highest stem biomass and total biomass, A and WUE under combined nano-Se application and drought stress”
e1“Tea plant”
Claim · model-written summary
Longjing 43 had the highest photosynthetic rate and water use efficiency under combined nano-Se and drought.
Verbatim
e0“‘Longjing 43’ had the highest stem biomass and total biomass, A and WUE under combined nano-Se application and drought stress”
e1“Tea plant”
Claim · model-written summary
Nano-Se significantly increased leaf selenium and nitrogen contents.
- Taxon
- Tea plante1
- Treatment
- nano-Se applicatione0
- Outcome
- leaf Se and leaf N contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“nano-Se application significantly increased the leaf Se and leaf N contents”
e1“Tea plant”
Claim · model-written summary
Nano-Se significantly increased soluble sugars, amino acids and tea polyphenols.
- Taxon
- Tea plante1
- Treatment
- nano-Se applicatione0
- Outcome
- levels of soluble sugars, amino acids and tea polyphenolse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“nano-Se application significantly increased the leaf Se and leaf N contents, the levels of soluble sugars, amino acids and tea polyphenols”
e1“Tea plant”
Claim · model-written summary
Longjing 43 had the highest leaf selenium and amino acid contents under nano-Se.
Verbatim
e0“‘Longjing 43’ had the highest leaf Se and amino acid contents under nano-Se application”
e1“Tea plant”
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See all 7 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.