Abstract
With the aim to contribute to the elucidation of the role of phytohormones in response of plants to adverse environmental conditions, seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS). In all four species, contents of chlorophylls (Chls) and carotenoids were markedly decreased during WS and after rehydration only in plants pre-treated with water but not in those pre-treated with ABA or BA. Contents of pigments of xanthophyll cycle increased during WS more in plants pre-treated with ABA or BA than in those pre-treated with water, but the degree of their de-epoxidation was highest in the later. Similarly, the efficiency of photosystem 2, determined as variable to maximal Chl fluorescence ratio, was not markedly decreased in bean plants pre-treated with ABA or BA in contrast to those pre-treated with water. The imposed WS was not severe enough to damage chloroplast ultrastructure. However, different changes in a size of starch inclusions were observed. In bean plants, the amount of starch increased considerably in plants pre-treated with water, while it decreased in BA pre-treated plants and no change was found in ABA pre-treated ones. The starch content declined under WS in sugar beet and tobacco plants but only moderate changes were found in ABA or BA pre-treated plants. Thus the application of BA and especially of ABA reduced the negative effects of subsequent WS.
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Claims 11
Claim · model-written summary
Water-pre-treated seedlings of all four species showed marked decreases in chlorophylls and carotenoids during and after water stress, unlike ABA- or BA-pre-treated seedlings.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays
Phaseolus vulgaris
Nicotiana tabacum
Zea mays
Beta vulgarise1 - Treatment
- water stress (WS)e1
- Outcome
- contents of chlorophylls (Chls) and carotenoidse2
- Direction
- markedly decreasede2
- Comparator
- pre-treated with watere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e2“In all four species, contents of chlorophylls (Chls) and carotenoids were markedly decreased during WS and after rehydration only in plants pre-treated with water but not in those pre-treated with ABA or BA”
Claim · model-written summary
ABA or BA pre-treatment increased xanthophyll cycle pigment contents during water stress more than water pre-treatment.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea maysPhaseolus vulgarisNicotiana tabacumZea maysBeta vulgarise1
- Treatment
- ABA or BAe3
- Outcome
- Contents of pigments of xanthophyll cyclee3
- Direction
- increasede3
- Comparator
- pre-treated with watere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e3“Contents of pigments of xanthophyll cycle increased during WS more in plants pre-treated with ABA or BA than in those pre-treated with water, but the degree of their de-epoxidation was highest in the later”
Claim · model-written summary
The degree of de-epoxidation of xanthophyll cycle pigments was highest in water-pre-treated seedlings.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea maysPhaseolus vulgarisNicotiana tabacumZea maysBeta vulgarise1
- Treatment
- pre-treated with watere3
- Outcome
- degree of their de-epoxidatione3
- Direction
- higheste3
- Comparator
- pre-treated with ABA or BAe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e3“Contents of pigments of xanthophyll cycle increased during WS more in plants pre-treated with ABA or BA than in those pre-treated with water, but the degree of their de-epoxidation was highest in the later”
Claim · model-written summary
ABA or BA pre-treatment kept photosystem 2 efficiency from markedly decreasing in bean plants under water stress.
Verbatim
e4“Similarly, the efficiency of photosystem 2, determined as variable to maximal Chl fluorescence ratio, was not markedly decreased in bean plants pre-treated with ABA or BA in contrast to those pre-treated with water”
Claim · model-written summary
The imposed water stress did not damage chloroplast ultrastructure.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea maysPhaseolus vulgarisNicotiana tabacumZea maysBeta vulgarise1
- Treatment
- imposed WSe5
- Outcome
- chloroplast ultrastructuree5
- Qualifier
- not severe enough to damagee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e5“The imposed WS was not severe enough to damage chloroplast ultrastructure”
Claim · model-written summary
Starch inclusion size changed in the seedlings during water stress treatments.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea maysPhaseolus vulgarisNicotiana tabacumZea maysBeta vulgarise1
- Outcome
- size of starch inclusionse6
- Qualifier
- different changese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e6“different changes in a size of starch inclusions were observed”
Claim · model-written summary
Water pre-treatment considerably increased starch amount in bean plants.
- Taxon
- bean plantse7
- Treatment
- pre-treated with watere7
- Outcome
- amount of starche7
- Direction
- increasede7
- Qualifier
- considerablye7
Not reportedComparator
Verbatim
e7“In bean plants, the amount of starch increased considerably in plants pre-treated with water”
Claim · model-written summary
BA pre-treatment decreased starch amount in bean plants.
Verbatim
e7“In bean plants, the amount of starch increased considerably in plants pre-treated with water”
e0“while it decreased in BA pre-treated plants and no change was found in ABA pre-treated ones”
Claim · model-written summary
ABA pre-treatment left starch amount in bean plants unchanged.
Verbatim
e7“In bean plants, the amount of starch increased considerably in plants pre-treated with water”
e0“while it decreased in BA pre-treated plants and no change was found in ABA pre-treated ones”
Claim · model-written summary
Water stress declined starch content in sugar beet and tobacco plants, with only moderate changes after ABA or BA pre-treatment.
- Taxon
- sugar beet and tobacco plants
Beta vulgaris subsp. vulgarisNicotiana tabacume0 - Treatment
- WSe0
- Outcome
- starch contente0
- Direction
- declinede0
- Comparator
- ABA or BA pre-treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The starch content declined under WS in sugar beet and tobacco plants but only moderate changes were found in ABA or BA pre-treated plants”
Claim · model-written summary
ABA and especially BA pre-treatment reduced the negative effects of subsequent water stress.
- Taxon
- Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea maysPhaseolus vulgarisNicotiana tabacumZea maysBeta vulgarise1
- Treatment
- application of BA and especially of ABAe0
- Outcome
- negative effects of subsequent WSe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“seedlings of Phaseolus vulgaris, Nicotiana tabacum, Beta vulgaris, and Zea mays were supplied with water, 100 µM abscisic acid (ABA), or 10 µM N6-benzyladenine (BA) immediately before imposition of water stress (WS)”
e0“Thus the application of BA and especially of ABA reduced the negative effects of subsequent WS”
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See all 85 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.