Abstract
The rate of dry matter accumulation by seeds of Vicia faba L. cv. Minica increases with temperature in the range of 16 to 26 degrees C. The duration of dry matter accumulation decreases with temperature, resulting in a decrease of final seed dry weight. In this study we test the hypothesis that a diffusion barrier for O(2), located in the seed coat, inhibits seed respiration and growth. The rate of O(2) uptake of intact seeds and of excised embryos and seed coats (separated seeds) was measured in air and buffer at 16, 20, and/or 26 degrees C at various O(2) concentrations and developmental stages. Oxygen uptake rates of intact seeds in buffer were only 9 to 15% of those in air. In buffer, the respiration rate of intact seeds decreased at a pO(2) below air saturation (21 kilopascals), whereas separated seeds showed a decline of O(2) uptake only below 80% of air saturation. In air, embryo excision had no effect on the sensitivity of seed respiration to pO(2), at both 20 and 26 degrees C. In air at 20 degrees C, separated and intact seeds showed similar rates of O(2) uptake. Oxygen uptake by intact seeds, both halfway and beyond the linear growth phase, showed a temperature coefficient Q(10) of 2.3 and was insensitive to pO(2) in the range of 80 to 100% of ambient. These results indicate that V. faba seed respiration in air is not limited by the diffusion of O(2) into the seed.
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Claims 11
Claim · model-written summary
The rate of dry matter accumulation by Vicia faba cv. Minica seeds increases with temperature between 16 and 26 degrees C.
- Taxon
- Vicia faba
Vicia fabat0 - Material
- cv. Minicae0
- Treatment
- temperature in the range of 16 to 26 degrees Ce0
- Outcome
- rate of dry matter accumulation by seedse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“The rate of dry matter accumulation by seeds of Vicia faba L. cv. Minica increases with temperature in the range of 16 to 26 degrees C”
Claim · model-written summary
The duration of seed dry matter accumulation decreases with temperature.
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- temperaturee0
- Outcome
- duration of dry matter accumulatione0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“The duration of dry matter accumulation decreases with temperature”
Claim · model-written summary
The decrease in duration of dry matter accumulation with temperature results in a decrease of final seed dry weight.
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- temperaturee0
- Outcome
- final seed dry weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“decreases with temperature, resulting in a decrease of final seed dry weight”
Claim · model-written summary
O2 uptake rates of intact seeds in buffer were only 9 to 15% of those in air.
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- in buffere0
- Outcome
- Oxygen uptake ratese0
- Direction
- lowerinferrede0
- Value
- 9 to 15%e0
- Comparator
- in aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“Oxygen uptake rates of intact seeds in buffer were only 9 to 15% of those in air”
Claim · model-written summary
In buffer, the respiration rate of intact seeds decreased at a pO2 below air saturation (21 kilopascals).
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- pO(2) below air saturation (21 kilopascals)e0
- Outcome
- respiration rate of intact seedse0
- Direction
- decreasede0
Not reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“the respiration rate of intact seeds decreased at a pO(2) below air saturation (21 kilopascals)”
Claim · model-written summary
In buffer, separated seeds showed a decline of O2 uptake only below 80% of air saturation.
- Taxon
- Vicia fabaVicia fabat0
- Material
- separated seedse0
- Treatment
- below 80% of air saturatione0
- Outcome
- O(2) uptakee0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“separated seeds showed a decline of O(2) uptake only below 80% of air saturation”
Claim · model-written summary
In air, embryo excision had no effect on the sensitivity of seed respiration to pO2 at both 20 and 26 degrees C.
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- embryo excisione0
- Outcome
- sensitivity of seed respiration to pO(2)e0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“In air, embryo excision had no effect on the sensitivity of seed respiration to pO(2), at both 20 and 26 degrees C”
Claim · model-written summary
In air at 20 degrees C, separated and intact seeds showed similar rates of O2 uptake.
- Taxon
- Vicia fabaVicia fabat0
- Treatment
- separatede0
- Outcome
- rates of O(2) uptakee0
- Direction
- similare0
- Comparator
- intacte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“In air at 20 degrees C, separated and intact seeds showed similar rates of O(2) uptake”
Claim · model-written summary
Oxygen uptake by intact seeds, both halfway and beyond the linear growth phase, showed a temperature coefficient Q10 of 2.3.
- Taxon
- Vicia fabaVicia fabat0
- Outcome
- temperature coefficient Q(10)e0
- Value
- 2.3e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“Oxygen uptake by intact seeds, both halfway and beyond the linear growth phase, showed a temperature coefficient Q(10) of 2.3 and was insensitive to pO(2) in the range of 80 to 100% of ambient”
Claim · model-written summary
Oxygen uptake by intact seeds was insensitive to pO2 in the range of 80 to 100% of ambient.
- Taxon
- Vicia fabaVicia fabat0
- Outcome
- insensitive to pO(2) in the range of 80 to 100% of ambiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“Oxygen uptake by intact seeds, both halfway and beyond the linear growth phase, showed a temperature coefficient Q(10) of 2.3 and was insensitive to pO(2) in the range of 80 to 100% of ambient”
Claim · model-written summary
The results indicate that V. faba seed respiration in air is not limited by the diffusion of O2 into the seed.
- Taxon
- Vicia fabaVicia fabat0
- Outcome
- seed respiration in aire0
- Qualifier
- not limited by the diffusion of O(2) into the seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vicia faba”
e0“V. faba seed respiration in air is not limited by the diffusion of O(2) into the seed”