Abstract
Chilling during male gametophyte development in rice inhibits development of microspores, causing male sterility. Changes in cellular ultrastructure that have been exposed to mild chilling include microspores with poor pollen wall formation, abnormal vacuolation and hypertrophy of the tapetum and unusual starch accumulation in the plastids of the endothecium in post-meiotic anthers. Anthers observed during tetrad release also have callose (1,3-beta-glucan) wall abnormalities as shown by immunocytochemical labelling. Expression of rice anther specific monosaccharide transporter (OsMST8) is greatly affected by chilling treatment. Perturbed carbohydrate metabolism, which is particularly triggered by repressed genes OsINV4 and OsMST8 during chilling, causes unusual starch storage in the endothecium and this also contributes to other symptoms such as vacuolation and poor microspore wall formation. Premature callose breakdown apparently restricts the basic framework of the future pollen wall. Vacuolation and hypertrophy are also symptoms of osmotic imbalance triggered by the reabsorption of callose breakdown products due to absence of OsMST8 activity.
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Claims 9
Claim · model-written summary
Chilling inhibits rice microspore development and causes male sterility.
- Taxon
- rice
Oryza sativae0 - Treatment
- Chillinge0
- Outcome
- development of microsporese0
- Direction
- inhibitse0
- Qualifier
- causing male sterilitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chilling during male gametophyte development in rice inhibits development of microspores, causing male sterility.”
Claim · model-written summary
Mild chilling is associated with poor microspore pollen wall formation and abnormal tapetal vacuolation and hypertrophy.
- Taxon
- riceOryza sativat0
- Organ / stage
- post-meiotic antherse0
- Treatment
- mild chillinge0
- Outcome
- poor pollen wall formation, abnormal vacuolation and hypertrophy of the tapetume0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in cellular ultrastructure that have been exposed to mild chilling include microspores with poor pollen wall formation, abnormal vacuolation and hypertrophy of the tapetum and unusual starch accumulation in the plastids of the endothecium in post-meiotic anthers.”
t0“rice”
Claim · model-written summary
Mild chilling produces unusual starch accumulation in endothecial plastids of post-meiotic rice anthers.
- Taxon
- riceOryza sativat0
- Organ / stage
- plastids of the endothecium in post-meiotic antherse0
- Treatment
- mild chillinge0
- Outcome
- unusual starch accumulatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in cellular ultrastructure that have been exposed to mild chilling include microspores with poor pollen wall formation, abnormal vacuolation and hypertrophy of the tapetum and unusual starch accumulation in the plastids of the endothecium in post-meiotic anthers.”
t0“rice”
Claim · model-written summary
Rice anthers at tetrad release have callose wall abnormalities.
- Taxon
- riceOryza sativat0
- Organ / stage
- tetrad releasee0
- Outcome
- callose (1,3-beta-glucan) wall abnormalitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Anthers observed during tetrad release also have callose (1,3-beta-glucan) wall abnormalities as shown by immunocytochemical labelling.”
t0“rice”
Claim · model-written summary
Chilling greatly affects expression of rice anther specific monosaccharide transporter OsMST8.
- Taxon
- riceOryza sativae0
- Treatment
- chilling treatmente0
- Gene
- OsMST8e0
- Outcome
- Expressione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expression of rice anther specific monosaccharide transporter (OsMST8) is greatly affected by chilling treatment.”
Claim · model-written summary
Repression of OsINV4 and OsMST8 during chilling triggers disturbed carbohydrate metabolism causing unusual endothecial starch storage.
- Taxon
- riceOryza sativat0
- Gene
- OsINV4 and OsMST8e0
- Outcome
- unusual starch storage in the endotheciume0
- Qualifier
- Perturbed carbohydrate metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Perturbed carbohydrate metabolism, which is particularly triggered by repressed genes OsINV4 and OsMST8 during chilling, causes unusual starch storage in the endothecium and this also contributes to other symptoms such as vacuolation and poor microspore wall formation.”
t0“rice”
Claim · model-written summary
Disturbed carbohydrate metabolism during chilling contributes to vacuolation and poor microspore wall formation.
- Taxon
- riceOryza sativat0
- Outcome
- vacuolation and poor microspore wall formatione0
- Qualifier
- Perturbed carbohydrate metabolisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Perturbed carbohydrate metabolism, which is particularly triggered by repressed genes OsINV4 and OsMST8 during chilling, causes unusual starch storage in the endothecium and this also contributes to other symptoms such as vacuolation and poor microspore wall formation.”
t0“rice”
Claim · model-written summary
Premature callose breakdown apparently restricts the future rice pollen wall framework.
- Taxon
- riceOryza sativat0
- Outcome
- basic framework of the future pollen walle0
- Qualifier
- Premature callose breakdowne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Premature callose breakdown apparently restricts the basic framework of the future pollen wall.”
t0“rice”
Claim · model-written summary
Absence of OsMST8 activity permits reabsorption of callose breakdown products, triggering osmotic imbalance manifested as vacuolation and hypertrophy.
- Taxon
- riceOryza sativat0
- Gene
- OsMST8e0
- Outcome
- Vacuolation and hypertrophye0
- Qualifier
- osmotic imbalance triggered by the reabsorption of callose breakdown productse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuolation and hypertrophy are also symptoms of osmotic imbalance triggered by the reabsorption of callose breakdown products due to absence of OsMST8 activity.”
t0“rice”
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See all 82 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.