Abstract
Well watered wheat (Triticum aestivum L. cv. Gabo) plants grown at 20°C were subjected to heat stress (30°C for 3 days), water stress (leaf water potential -2.54 MPa) or exogenous application of abscisic acid (ABA, 3 × 10-5 M) during meiosis in the pollen mother cells. All these treatments caused male sterility. The developmental anatomy of abortive anthers and pollen grains was studied using light microscopy. The anatomical events leading to pollen abortion in response to heat stress, water stress, and abscisic acid were generally similar. Three developmental sequences leading to sterility were identified. Type 1 was observed in response to heat stress and ABA. Premature tapetal degeneration resulted in periplasmodial invasion of the locule at meiosis and resulted in total sterility. Type 2 was observed in response to water stress when the microspores lost contact with the tapetum at first pollen grain mitosis (PGM I) and the filament degenerated. This also resulted in total sterility. Type 3 was observed in response to all three stresses and led to partial sterility. The microspores completed PGM 1 but a proportion became disoriented from the tapetum and developed no further. Each stress treatment resulted in two groups of abnormal anther locules, one completely sterile and the other partially sterile. Heat stress and ABA resulted in very similar abnormal development which differed only in the proportion of the two types (1 and 3). Water stress produced partial sterility through the same developmental pattern as heat stress and ABA (type 3). The sequence leading to total sterility in water stress affected anthers (type 2) was similar to that resulting in partial sterility (type 3). The results do not support the hypothesis that ABA is the single primary controlling agent in water stress induced sterility and the question of whether similar mechanisms lead to male sterility in response to the three treatments remains unanswered.
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Claims 9
Claim · model-written summary
Heat stress caused wheat male sterility.
- Taxon
- wheat (Triticum aestivum L. cv. Gabo)
Triticum aestivume1 - Treatment
- heat stress (30°C for 3 days)e1
- Outcome
- male sterilitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All these treatments caused male sterility.”
e1“wheat (Triticum aestivum L. cv. Gabo) plants grown at 20°C were subjected to heat stress (30°C for 3 days)”
Claim · model-written summary
Water stress caused wheat male sterility.
- Taxon
- wheat (Triticum aestivum L. cv. Gabo)Triticum aestivume1
- Treatment
- water stress (leaf water potential -2.54 MPa)e1
- Outcome
- male sterilitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All these treatments caused male sterility.”
e1“wheat (Triticum aestivum L. cv. Gabo) plants grown at 20°C were subjected to heat stress (30°C for 3 days), water stress (leaf water potential -2.54 MPa)”
Claim · model-written summary
Exogenous ABA caused wheat male sterility.
- Taxon
- wheat (Triticum aestivum L. cv. Gabo)Triticum aestivume1
- Treatment
- exogenous application of abscisic acid (ABA, 3 × 10-5 M)e1
- Outcome
- male sterilitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All these treatments caused male sterility.”
e1“wheat (Triticum aestivum L. cv. Gabo) plants grown at 20°C were subjected to heat stress (30°C for 3 days), water stress (leaf water potential -2.54 MPa) or exogenous application of abscisic acid (ABA, 3 × 10-5 M)”
Claim · model-written summary
Heat stress and ABA produced type 1 anther failure through premature tapetal degeneration and locule invasion, causing total sterility.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- tapetale0
- Outcome
- total sterilitye0
- Qualifier
- Premature tapetal degeneratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Type 1 was observed in response to heat stress and ABA. Premature tapetal degeneration resulted in periplasmodial invasion of the locule at meiosis and resulted in total sterility.”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
Claim · model-written summary
Water stress produced type 2 total sterility when microspores lost tapetal contact and the filament degenerated.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- microsporese0
- Treatment
- water stresse0
- Outcome
- total sterilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Type 2 was observed in response to water stress when the microspores lost contact with the tapetum at first pollen grain mitosis (PGM I) and the filament degenerated. This also resulted in total sterility.”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
Claim · model-written summary
All three stresses produced type 3 partial sterility after some microspores lost tapetal orientation following first mitosis.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- microsporese0
- Outcome
- partial sterilitye0
- Qualifier
- all three stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Type 3 was observed in response to all three stresses and led to partial sterility. The microspores completed PGM 1 but a proportion became disoriented from the tapetum and developed no further.”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
Claim · model-written summary
Each stress produced both fully sterile and partly sterile abnormal anther locules.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- anther loculese0
- Outcome
- abnormal anther loculese0
- Qualifier
- one completely sterile and the other partially sterilee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each stress treatment resulted in two groups of abnormal anther locules, one completely sterile and the other partially sterile.”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
Claim · model-written summary
Heat and ABA caused similar abnormal development but different proportions of types 1 and 3.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Heat stress and ABAe0
- Outcome
- abnormal developmente0
- Qualifier
- differed only in the proportion of the two types (1 and 3)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress and ABA resulted in very similar abnormal development which differed only in the proportion of the two types (1 and 3).”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
Claim · model-written summary
The findings do not support ABA as the sole primary controller of water stress induced sterility.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- water stress induced sterilitye0
- Qualifier
- do not support the hypothesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results do not support the hypothesis that ABA is the single primary controlling agent in water stress induced sterility”
t0“Development Anatomy in Wheat of Male Sterility Induced by Heat Stress, Water Deficit or Abscisic Acid”
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See all 60 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.