Abstract
There is increasing evidence that the spatial distribution of water within the root zone, as well as total soil water status, determines plant physiological and agronomic responses. To examine the response of photosynthesis, chlorophyll fluorescence and growth of hot pepper (Capsicum annuum L.) to deficit irrigation (DI50, 50% of the control) and partial root-zone drying (PRD, with half of the root system exposed to soil drying and the other half watered with 50% irrigation water of the control), two water deficit treatments were imposed on greenhouse grown hot pepper during the growing period in 2006. Control plants received irrigation to both halves of the root system when soil water content was < 80% of field capacity. Both PRD and DI50 treatments decreased total dry mass by 33 to 44%, shoot biomass by 31 to 44% compared to the control. These treatments increased root-shoot ratio by 35 to 44% in relation to the control, with significant differences between PRD, DI50 and the control. Deficit irrigation led to a relative leaf water content of about 77.91 to 92.71%. Two water deficit treatments reduced photosynthetic rate (Pn) slightly and transpiration rate (Tr) significantly, thus improving leaf water use efficiency (WUEL, defined as the ratio of Pn to Tr) by 24 to 26%. During water stress, a down-regulation of PSII activity was observed along with some impairment of photochemical activity, as revealed by decreases in the maximum quantum yield of PSII (Fv/Fm). Although Fv/Fm did not significantly differ between the deficit treatments and the control, Fv/Fm of PRD plants was higher than that of DI50 plants. The mean values of Fv, Fm, qP at four stages decreased and Fo and qN increased in the soil drought environment. Development of non-radiative energy dissipation mechanisms was evidenced during stress by increases in non-photochemical quenching and decreases in efficiency of excitation capture by open centers. Key words: Photochemical parameters, relative leaf water content, DI50, partial root-zone drying (PRD).
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Claims 14
Claim · model-written summary
PRD and DI50 decreased total dry mass by 33 to 44% versus the control.
- Taxon
- hot pepper
Capsicum frutescenst0 - Treatment
- PRD and DI50 treatmentse0
- Outcome
- total dry masse0
- Direction
- decreasede0
- Value
- 33 to 44%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both PRD and DI50 treatments decreased total dry mass by 33 to 44%, shoot biomass by 31 to 44% compared to the control”
t0“hot pepper”
Claim · model-written summary
PRD and DI50 decreased shoot biomass by 31 to 44% versus the control.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- PRD and DI50 treatmentse0
- Outcome
- shoot biomasse0
- Direction
- decreasede0
- Value
- 31 to 44%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both PRD and DI50 treatments decreased total dry mass by 33 to 44%, shoot biomass by 31 to 44% compared to the control”
t0“hot pepper”
Claim · model-written summary
Both deficit treatments increased root-shoot ratio by 35 to 44% versus control, significantly.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- These treatmentse0
- Outcome
- root-shoot ratioe0
- Direction
- increasede0
- Value
- 35 to 44%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These treatments increased root-shoot ratio by 35 to 44% in relation to the control, with significant differences between PRD, DI50 and the control”
t0“hot pepper”
Claim · model-written summary
Deficit irrigation resulted in relative leaf water content of about 77.91 to 92.71%.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- Deficit irrigatione0
- Outcome
- relative leaf water contente0
- Value
- 77.91 to 92.71%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficit irrigation led to a relative leaf water content of about 77.91 to 92.71%”
t0“hot pepper”
Claim · model-written summary
The water deficit treatments slightly reduced photosynthetic rate.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- Two water deficit treatmentse0
- Outcome
- photosynthetic rate (Pn)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two water deficit treatments reduced photosynthetic rate (Pn) slightly and transpiration rate (Tr) significantly”
t0“hot pepper”
Claim · model-written summary
The water deficit treatments significantly reduced transpiration rate.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- Two water deficit treatmentse0
- Outcome
- transpiration rate (Tr)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two water deficit treatments reduced photosynthetic rate (Pn) slightly and transpiration rate (Tr) significantly”
t0“hot pepper”
Claim · model-written summary
The water deficit treatments improved leaf water use efficiency by 24 to 26%.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- Two water deficit treatmentse1
- Outcome
- leaf water use efficiencye0
- Direction
- improvinge0
- Value
- 24 to 26%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus improving leaf water use efficiency (WUEL, defined as the ratio of Pn to Tr) by 24 to 26%”
e1“Two water deficit treatments”
t0“hot pepper”
Claim · model-written summary
Water stress down-regulated PSII activity and impaired photochemical activity, with decreased Fv/Fm.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- water stresse0
- Outcome
- maximum quantum yield of PSII (Fv/Fm)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During water stress, a down-regulation of PSII activity was observed along with some impairment of photochemical activity, as revealed by decreases in the maximum quantum yield of PSII (Fv/Fm)”
t0“hot pepper”
Claim · model-written summary
Fv/Fm did not differ significantly between deficit treatments and control.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- the deficit treatmentse0
- Outcome
- Fv/Fme0
- Direction
- did not significantly differe0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm did not significantly differ between the deficit treatments and the control”
t0“hot pepper”
Claim · model-written summary
Fv/Fm was higher under PRD than DI50.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm of PRD plants was higher than that of DI50 plants”
t0“hot pepper”
Claim · model-written summary
Under soil drought, mean Fv, Fm, and qP decreased at four stages.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- soil drought environmente0
- Outcome
- Fv, Fm, qPe0
- Direction
- decreasede0
- Qualifier
- at four stagese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean values of Fv, Fm, qP at four stages decreased and Fo and qN increased in the soil drought environment”
t0“hot pepper”
Claim · model-written summary
Under soil drought, Fo and qN increased.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- soil drought environmente0
- Outcome
- Fo and qNe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean values of Fv, Fm, qP at four stages decreased and Fo and qN increased in the soil drought environment”
t0“hot pepper”
Claim · model-written summary
Stress increased non-photochemical quenching.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- stresse0
- Outcome
- non-photochemical quenchinge0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of non-radiative energy dissipation mechanisms was evidenced during stress by increases in non-photochemical quenching and decreases in efficiency of excitation capture by open centers”
t0“hot pepper”
Claim · model-written summary
Stress decreased efficiency of excitation capture by open centers.
- Taxon
- hot pepperCapsicum frutescenst0
- Treatment
- stresse0
- Outcome
- efficiency of excitation capture by open centerse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of non-radiative energy dissipation mechanisms was evidenced during stress by increases in non-photochemical quenching and decreases in efficiency of excitation capture by open centers”
t0“hot pepper”
The same questions in other papers
irrigation · physiology: photosynthesis · Capsicum frutescens (hot pepper)Positive and negative results
1 in the opposite direction
- negative
drought · physiology: water · Capsicum frutescens (hot pepper)Positive and negative results
1 in the opposite direction
- negative
irrigation · growth · Capsicum frutescens (hot pepper)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
1 paper more in this group
See all 5 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.