Abstract
Leaf senescence plays a vital role in nutrient recycling and overall capacity to assimilate carbon dioxide. Cotton premature leaf senescence, often accompanied with unexpected short-term low temperature, has been occurring with an increasing frequency in many cotton-growing areas and causes serious reduction in yield and quality of cotton. The key factors for causing and promoting cotton premature leaf senescence are still unclear. In this case, the relationship between the pre-chilling stress and Alternaria alternata infection for causing cotton leaf senescence was investigated under precisely controlled laboratory conditions with four to five leaves stage cotton plants. The results showed short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves, which could be recovered to normal levels in 2-4 days when the chilling stresses were removed. When these chilling stress injured leaves were further inoculated with A. alternata, the pronounced appearance and development of leaf spot disease, and eventually the pronounced symptoms of leaf senescence, occurred on these cotton leaves. The onset of cotton leaf senescence at this condition was also reflected in various physiological indexes such as irreversible increase in malondialdehyde (MDA) content and electrolyte leakage, irreversible decrease in soluble protein content and chlorophyll content, and irreversible damage in leaves' photosynthesis ability. The presented results demonstrated that chilling stress acted as the key predisposing factor for causing A. alternata infection and leading to cotton leaf senescence. It could be expected that the understanding of the key factors causing and promoting cotton leaf senescence would be helpful for taking appropriate management steps to prevent cotton premature leaf senescence.
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Claims 8
Claim · model-written summary
Short-term chilling stress caused a degree of physiological impairment in cotton leaves.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- short-term chilling stresse0
- Outcome
- physiological impairmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
Claim · model-written summary
The chilling-induced impairment was recovered to normal levels in 2-4 days after the chilling stress was removed.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- when the chilling stresses were removede1
- Outcome
- recovered to normal levelse1
- Value
- 2-4 dayse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
e1“which could be recovered to normal levels in 2-4 days when the chilling stresses were removed”
Claim · model-written summary
Inoculation of chilling-injured cotton leaves with A. alternata caused leaf spot disease.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- inoculated with A. alternatae1
- Interactor
- A. alternata
.jpg?width=60)
Alternaria alternatae1pathogen - Outcome
- appearance and development of leaf spot diseasee2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
e1“When these chilling stress injured leaves were further inoculated with A. alternata”
e2“the pronounced appearance and development of leaf spot disease”
Claim · model-written summary
Inoculation of chilling-injured cotton leaves with A. alternata caused pronounced symptoms of leaf senescence.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- inoculated with A. alternatae0
- Interactor
- A. alternataAlternaria alternatae0pathogen
- Outcome
- symptoms of leaf senescencee1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When these chilling stress injured leaves were further inoculated with A. alternata”
e1“the pronounced symptoms of leaf senescence, occurred on these cotton leaves”
Claim · model-written summary
The stress treatment increased malondialdehyde content and electrolyte leakage in cotton leaves irreversibly.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- malondialdehyde (MDA) content and electrolyte leakagee1
- Direction
- increasee1
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
e1“irreversible increase in malondialdehyde (MDA) content and electrolyte leakage”
Claim · model-written summary
The stress treatment decreased soluble protein and chlorophyll content in cotton leaves irreversibly.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- soluble protein content and chlorophyll contente1
- Direction
- decreasee1
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
e1“irreversible decrease in soluble protein content and chlorophyll content”
Claim · model-written summary
The stress treatment irreversibly damaged the photosynthesis ability of cotton leaves.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- irreversible damage in leaves' photosynthesis abilitye1
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“short-term chilling stress could cause a certain degree of physiological impairment to cotton leaves”
e1“irreversible damage in leaves' photosynthesis ability”
Claim · model-written summary
Chilling stress acted as the key predisposing factor for A. alternata infection and leaf senescence in cotton.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- chilling stresse0
- Interactor
- A. alternataAlternaria alternatae0pathogen
- Outcome
- leaf senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling stress acted as the key predisposing factor for causing A. alternata infection and leading to cotton leaf senescence”
The same questions in other papers
inoculation · disease · Gossypium hirsutum (cotton)Positive and negative results
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- positive
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