Abstract
Water shortage is a critical problem touching plant growth and yield in semi-arid areas, for instance the Mediterranean region. For this reason was studied the physiological basis of drought tolerance of a new, drought tolerant crop quinoa (Chenopodium quinoa Willd.) tested in Morocco in two successive seasons, subject to four irrigation treatments (100, 50, and 33%ETc, and rainfed). The chlorophyll a fluorescence transients were analyzed by the JIP-test to translate stressinduced damage in these transients to changes in biophysical parameter's allowing quantification of the energy flow through the photosynthetic apparatus. Drought stress induced a significant decrease in the maximum quantum yield of primary photochemistry (P0 = Fv/Fm), and the quantum yield of electron transport (E0). The amount of active Photosystem II (PSII) reaction centers (RC) per excited cross section (RC/CS) also decreased when exposed to the highest drought stress. The effective antenna size of active RCs (ABS/RC) increased and the effective dissipation per active reaction centers (DIo/RC) increased by increasing drought stress during the growth season in comparison to the control. However the performance index (PI), was a very sensitive indicator of the physiological status of plants. Leaf area index, leaf water potential and stomatal conductance decreased as the drought increased. These results indicate that, in quinoa leaf, JIP-test can be used as a sensitive method for measuring drought stress effects.
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Claims 10
Claim · model-written summary
Drought significantly decreased maximum quantum yield of primary photochemistry.
- Taxon
- quinoa
Chenopodium quinoat0 - Treatment
- Drought stresse0
- Outcome
- maximum quantum yield of primary photochemistrye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced a significant decrease in the maximum quantum yield of primary photochemistry (P0 = Fv/Fm)”
t0“quinoa”
Claim · model-written summary
Drought significantly decreased quantum yield of electron transport.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- Drought stresse0
- Outcome
- quantum yield of electron transporte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress induced a significant decrease in the maximum quantum yield of primary photochemistry (P0 = Fv/Fm), and the quantum yield of electron transport (E0)”
t0“quinoa”
Claim · model-written summary
Active PSII reaction centers per excited cross section decreased under highest drought stress.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- highest drought stresse0
- Outcome
- active Photosystem II (PSII) reaction centers (RC) per excited cross section (RC/CS)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of active Photosystem II (PSII) reaction centers (RC) per excited cross section (RC/CS) also decreased when exposed to the highest drought stress”
t0“quinoa”
Claim · model-written summary
Effective antenna size of active reaction centers increased with drought stress relative to control.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- increasing drought stresse0
- Outcome
- effective antenna size of active RCs (ABS/RC)e0
- Direction
- increasede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effective antenna size of active RCs (ABS/RC) increased and the effective dissipation per active reaction centers (DIo/RC) increased by increasing drought stress during the growth season in comparison to the control”
t0“quinoa”
Claim · model-written summary
Effective dissipation per active reaction center increased with drought stress relative to control.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- increasing drought stresse0
- Outcome
- effective dissipation per active reaction centers (DIo/RC)e0
- Direction
- increasede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effective antenna size of active RCs (ABS/RC) increased and the effective dissipation per active reaction centers (DIo/RC) increased by increasing drought stress during the growth season in comparison to the control”
t0“quinoa”
Claim · model-written summary
Performance index was a very sensitive indicator of plant physiological status.
- Taxon
- quinoaChenopodium quinoat0
- Outcome
- very sensitive indicator of the physiological status of plantse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the performance index (PI), was a very sensitive indicator of the physiological status of plants”
t0“quinoa”
Claim · model-written summary
Leaf area index decreased as drought increased.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- droughte0
- Outcome
- Leaf area indexe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index, leaf water potential and stomatal conductance decreased as the drought increased”
t0“quinoa”
Claim · model-written summary
Leaf water potential decreased as drought increased.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- droughte0
- Outcome
- leaf water potentiale0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index, leaf water potential and stomatal conductance decreased as the drought increased”
t0“quinoa”
Claim · model-written summary
Stomatal conductance decreased as drought increased.
- Taxon
- quinoaChenopodium quinoat0
- Treatment
- droughte0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index, leaf water potential and stomatal conductance decreased as the drought increased”
t0“quinoa”
Claim · model-written summary
The JIP-test can sensitively measure drought stress effects in quinoa leaves.
- Taxon
- quinoaChenopodium quinoat0
- Organ / stage
- leafe0
- Outcome
- sensitive method for measuring drought stress effectse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in quinoa leaf, JIP-test can be used as a sensitive method for measuring drought stress effects”
t0“quinoa”
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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.