Abstract
Senescence is an important developmental process in the life span of a plant. It is affected by several endogenous and exogenous factors such as hormones, darkness, and drought. Hormones are major endogenous factors that affect senescence intensively. In this study, our aim was to investigate the effects of different plant growth regulators; benzyl adenin (BA), spermine (Spm) and spermidine (Spd) on both natural and dark-induced senescence and on γ-aminobutyric acid (GABA) content in wheat leaf segments. Following the incubation, fresh and dry weight, chlorophyll and carotenoid contents; peroxidase activity, soluble protein, GABA and malondialdehyde (MDA) contents and cell death amount were determined. Our results demonstrate that Spm and Spd accelerated senescence under light and delayed it under dark conditions. BA has delayed leaf senescence under both conditions. Cell death and MDA content showed a correlation with the senescence process. GABA content was enhanced considerably by BA, Spm and Spd applications under light conditions. According to our results we can conclude that Spm and Spd could promote senescence on wheat segments under light conditions, whereas inhibit senescence under dark conditions. In addition, BA could retard the deleterious effects on senescence under both light and dark conditions. ********* In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue. *********
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Claims 9
Claim · model-written summary
Spermine accelerated senescence in wheat leaf segments under light.
- Taxon
- Wheat
Triticum aestivumt0 - Organ / stage
- Leaf Segmentst0
- Treatment
- Spme0
- Outcome
- senescencee0
- Direction
- acceleratede0
- Qualifier
- under lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e0“Spm and Spd accelerated senescence under light and delayed it under dark conditions”
Claim · model-written summary
Spermidine accelerated senescence in wheat leaf segments under light.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- Spde0
- Outcome
- senescencee0
- Direction
- acceleratede0
- Qualifier
- under lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e0“Spm and Spd accelerated senescence under light and delayed it under dark conditions”
Claim · model-written summary
Spermine delayed senescence in wheat leaf segments under dark conditions.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- Spme0
- Outcome
- senescencee0
- Direction
- delayede0
- Qualifier
- under dark conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e0“Spm and Spd accelerated senescence under light and delayed it under dark conditions”
Claim · model-written summary
Spermidine delayed senescence in wheat leaf segments under dark conditions.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- Spde0
- Outcome
- senescencee0
- Direction
- delayede0
- Qualifier
- under dark conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e0“Spm and Spd accelerated senescence under light and delayed it under dark conditions”
Claim · model-written summary
BA delayed leaf senescence under both light and dark conditions.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- BAe1
- Outcome
- leaf senescencee1
- Direction
- delayede1
- Qualifier
- under both conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e1“BA has delayed leaf senescence under both conditions”
Claim · model-written summary
Cell death and MDA content correlated with the senescence process.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Outcome
- Cell death and MDA contente2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e2“Cell death and MDA content showed a correlation with the senescence process”
Claim · model-written summary
BA considerably enhanced GABA content in wheat leaf segments under light.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- BAe3
- Outcome
- GABA contente3
- Direction
- enhancede3
- Qualifier
- under light conditionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e3“GABA content was enhanced considerably by BA, Spm and Spd applications under light conditions”
Claim · model-written summary
Spermine considerably enhanced GABA content in wheat leaf segments under light.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- Spme3
- Outcome
- GABA contente3
- Direction
- enhancede3
- Qualifier
- under light conditionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e3“GABA content was enhanced considerably by BA, Spm and Spd applications under light conditions”
Claim · model-written summary
Spermidine considerably enhanced GABA content in wheat leaf segments under light.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Leaf Segmentst0
- Treatment
- Spde3
- Outcome
- GABA contente3
- Direction
- enhancede3
- Qualifier
- under light conditionse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Leaf Segments”
e3“GABA content was enhanced considerably by BA, Spm and Spd applications under light conditions”
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