Abstract
The responses of Q. robur L. fruits, seeds and embryonic axes to desiccation are characterized and discussed in relation to current knowledge of recalcitrant seed behaviour. A relationship between viability and seed moisture content is described. This relationship was unaffected by rate of drying, year of harvest or presence of the pericarp. Desiccation sensitivity did not increase with storage. Excised embryonic axes survived to lower moisture contents than intact seeds. However, in the intact seed, loss of viability appeared to be determined by a critical moisture content in the cotyledons. Consequently, the level of desiccation tolerance within the axis attached to cotyledons was not determined by axis drying rate. A link is drawn between the difference in the desiccation tolerance of embryonic axes and of cotyledons, and estimates of their different levels of matrix-bound water. The results presented are consistent with a critical moisture content for survival which is determined by the loss of all free cellular water. This hypothesis takes account of the differential desiccation sensitivity of seed tissues and differences in desiccation tolerance between species.
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Claims 7
Claim · model-written summary
A relationship between viability and seed moisture content of Quercus robur was described.
- Taxon
- Quercus robur
Quercus roburt0 - Organ / stage
- seede1
- Outcome
- viabilitye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e0“The responses of Q. robur L. fruits, seeds and embryonic axes to desiccation are characterized and discussed in relation to current knowledge of recalcitrant seed behaviour”
e1“A relationship between viability and seed moisture content is described”
Claim · model-written summary
The viability and moisture content relationship was unaffected by drying rate, harvest year or presence of the pericarp.
- Taxon
- Quercus roburQuercus roburt0
- Treatment
- rate of drying, year of harvest or presence of the pericarpe2
- Outcome
- relationshipe2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e1“A relationship between viability and seed moisture content is described”
e2“This relationship was unaffected by rate of drying, year of harvest or presence of the pericarp”
Claim · model-written summary
Desiccation sensitivity of Quercus robur did not increase with storage.
- Taxon
- Quercus roburQuercus roburt0
- Treatment
- storagee3
- Outcome
- Desiccation sensitivitye3
- Direction
- did not increasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e3“Desiccation sensitivity did not increase with storage”
Claim · model-written summary
Excised embryonic axes survived to lower moisture contents than intact seeds.
- Taxon
- Quercus roburQuercus roburt0
- Material
- Excised embryonic axese4
- Outcome
- survived to lower moisture contentse4
- Direction
- lowere4
- Comparator
- intact seedse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e4“Excised embryonic axes survived to lower moisture contents than intact seeds”
Claim · model-written summary
In intact Quercus robur seeds, loss of viability appears to be determined by a critical moisture content in the cotyledons.
- Taxon
- Quercus roburQuercus roburt0
- Organ / stage
- cotyledonse5
- Outcome
- loss of viabilitye5
- Qualifier
- critical moisture contente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e5“in the intact seed, loss of viability appeared to be determined by a critical moisture content in the cotyledons”
Claim · model-written summary
Desiccation tolerance within the axis attached to cotyledons was not determined by axis drying rate.
- Taxon
- Quercus roburQuercus roburt0
- Organ / stage
- axis attached to cotyledonse6
- Outcome
- level of desiccation tolerancee6
- Comparator
- axis drying ratee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e6“the level of desiccation tolerance within the axis attached to cotyledons was not determined by axis drying rate”
Claim · model-written summary
Survival is consistent with a critical moisture content determined by the loss of all free cellular water.
- Taxon
- Quercus roburQuercus roburt0
- Outcome
- survivale7
- Qualifier
- loss of all free cellular watere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Embryo Water Status and Survival in the Recalcitrant SpeciesQuercus roburL: Evidence for a Critical Moisture Content”
e7“The results presented are consistent with a critical moisture content for survival which is determined by the loss of all free cellular water”