Abstract
A pot experiment with controlled water supply was conducted to study the effects of drought stress (continuous drought for 0 d, 5 d, 10 d, ... 45 d) on the photosynthetic characteristics and growth of Jatropha curcas seedlings under different nitrogen fertilization levels (N0, 0 kg N x hm(-2); N(L), 96 kg N x hm(-2; N(M), 288 kg N x hm(-2); N(H), 480 kg N x hm(-2)). With the enhancement of drought stress, the leaf relative water content (RWC1), height growth (Z(h)), basal diameter growth (Z(d), leaf area (L(a)), net photosynthetic rate ( P(n)), transpiration rate (T(r)), and stomatal conductance (G(s)) decreased significantly (P < 0.01), irrespective of nitrogen fertilization level. The chlorophyll (Chl) content and water use efficiency (WUE) increased first and decreased then, while the intercellular CO2, concentration (C(i)) had an increase after an initial decrease. Under adequate water condition, nitrogen fertilization promoted the photosynthesis and growth of J. curcas seedlings to different degrees, and the effect was increased with increasing nitrogen fertilization level. Under drought stress, the effects of nitrogen nutrition on the photosynthesis and growth were dependent on drought intensity and nitrogen fertilization level. Specifically, increasing nitrogen fertilization level could promote the photosynthesis and growth of J. curcas seedlings under mild drought, the promotion effect of N(M) was higher than that of N(L) and N(H) under moderate drought, and N(L) had the best promotion effect while N(H) weakened the effect or made it negative under severe drought.
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Claims 9
Claim · model-written summary
Increasing drought significantly reduced leaf relative water content, height growth, basal diameter growth, and leaf area.
- Taxon
- Jatropha curcas
_tree_at_Samedha.jpg?width=60)
Jatropha curcast0 - Treatment
- drought stresse0
- Outcome
- leaf relative water content (RWC1), height growth (Z(h)), basal diameter growth (Z(d), leaf area (L(a))e0
- Direction
- decreasede0
- Qualifier
- irrespective of nitrogen fertilization levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e0“With the enhancement of drought stress, the leaf relative water content (RWC1), height growth (Z(h)), basal diameter growth (Z(d), leaf area (L(a)), net photosynthetic rate ( P(n)), transpiration rate (T(r)), and stomatal conductance (G(s)) decreased significantly (P < 0.01), irrespective of nitrogen fertilization level.”
t0“Jatropha curcas”
Claim · model-written summary
Increasing drought significantly reduced net photosynthetic, transpiration, and stomatal conductance rates.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- drought stresse0
- Outcome
- net photosynthetic rate ( P(n)), transpiration rate (T(r)), and stomatal conductance (G(s))e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the enhancement of drought stress, the leaf relative water content (RWC1), height growth (Z(h)), basal diameter growth (Z(d), leaf area (L(a)), net photosynthetic rate ( P(n)), transpiration rate (T(r)), and stomatal conductance (G(s)) decreased significantly (P < 0.01), irrespective of nitrogen fertilization level.”
t0“Jatropha curcas”
Claim · model-written summary
Chlorophyll content and water use efficiency first increased, then decreased with drought.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- drought stresse1
- Outcome
- chlorophyll (Chl) content and water use efficiency (WUE)e0
- Direction
- increased first and decreased thene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll (Chl) content and water use efficiency (WUE) increased first and decreased then”
t0“Jatropha curcas”
e1“With the enhancement of drought stress”
Claim · model-written summary
Intercellular CO2 first decreased and then increased.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- drought stresse1
- Outcome
- intercellular CO2, concentration (C(i))e0
- Direction
- increase after an initial decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the intercellular CO2, concentration (C(i)) had an increase after an initial decrease.”
t0“Jatropha curcas”
e1“With the enhancement of drought stress”
Claim · model-written summary
Nitrogen fertilization promoted photosynthesis and growth under adequate water, increasingly at higher levels.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- nitrogen fertilizatione0
- Outcome
- photosynthesis and growthe0
- Direction
- promotede0
- Qualifier
- Under adequate water conditione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under adequate water condition, nitrogen fertilization promoted the photosynthesis and growth of J. curcas seedlings to different degrees, and the effect was increased with increasing nitrogen fertilization level.”
Claim · model-written summary
Under mild drought, increasing nitrogen fertilization promoted photosynthesis and growth.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- increasing nitrogen fertilization levele0
- Outcome
- photosynthesis and growthe0
- Direction
- promotee0
- Qualifier
- under mild droughte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing nitrogen fertilization level could promote the photosynthesis and growth of J. curcas seedlings under mild drought”
Claim · model-written summary
Under moderate drought, N(M) promoted photosynthesis and growth more than N(L) or N(H).
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N(M)e0
- Outcome
- promotion effecte0
- Direction
- highere0
- Qualifier
- under moderate droughte0
- Comparator
- N(L) and N(H)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the promotion effect of N(M) was higher than that of N(L) and N(H) under moderate drought”
t0“Jatropha curcas”
Claim · model-written summary
Under severe drought, N(L) had the best promotion effect.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N(L)e0
- Outcome
- promotion effecte0
- Direction
- beste0
- Qualifier
- under severe droughte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N(L) had the best promotion effect while N(H) weakened the effect or made it negative under severe drought.”
t0“Jatropha curcas”
Claim · model-written summary
Under severe drought, N(H) weakened the effect or made it negative.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N(H)e0
- Outcome
- effecte0
- Direction
- weakenede0
- Qualifier
- under severe droughte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N(H) weakened the effect or made it negative under severe drought.”
t0“Jatropha curcas”
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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.