Abstract
Orthodox seeds become desiccation-sensitive as they undergo germination. As a result, germinating seeds serve as a model to study desiccation sensitivity in plant tissues. The effects of the rate of drying on the viability, respiratory metabolism and free radical processes were thus studied during dehydration and wet storage of radicles of Pisum sativum. For both drying regimes desiccation could be described by exponential and inverse modified functions. Viability, as assessed by germination capacity and tetrazolium staining, remained at 100% during rapid (< 24 h) desiccation. However, it declined sharply at c. 0.26 g g¹ dm following slow (c. 5 days) drying. Increasing the rate of dehydration thus lowered the critical water content for survival. Rapid desiccation was also associated with higher activities and levels of malate dehydrogenase and the oxidized form of nicotinamide adenine dinucleotide. It was also accompanied by lower hydroperoxide levels and membrane damage. In addition, the activitiy of glutathione reductase was greater during rapid drying. Ageing may have contributed to increased damage during slow dehydration, since viability declined even in wet storage after two weeks. The results presented are consistent with rapid desiccation reducing the accumulation of damage resulting from desiccation-induced aqueous-based deleterious reactions. In addition, they show that radicles are a useful model to study desiccation sensitivity in plant tissues.
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Claims 8
Claim · model-written summary
Rapid desiccation retained full radicle viability.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Treatment
- rapid (< 24 h) desiccatione0
- Outcome
- Viabilitye0
- Direction
- remainede0
- Value
- 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Viability, as assessed by germination capacity and tetrazolium staining, remained at 100% during rapid (< 24 h) desiccation.”
t0“Pisum sativum”
Claim · model-written summary
Slow drying sharply reduced viability at about 0.26 g g¹ dm.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- slow (c. 5 days) dryinge0
- Outcome
- Viabilitye0
- Direction
- declined sharplye0
- Value
- c. 0.26 g g¹ dme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Viability, as assessed by germination capacity and tetrazolium staining, remained at 100% during rapid (< 24 h) desiccation. However, it declined sharply at c. 0.26 g g¹ dm following slow (c. 5 days) drying.”
t0“Pisum sativum”
Claim · model-written summary
Faster dehydration lowered critical water content for survival.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Increasing the rate of dehydratione0
- Outcome
- critical water content for survivale0
- Direction
- lowerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the rate of dehydration thus lowered the critical water content for survival.”
t0“Pisum sativum”
Claim · model-written summary
Rapid desiccation increased malate dehydrogenase activity and levels of oxidized NAD.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Rapid desiccatione0
- Outcome
- activities and levels of malate dehydrogenase and the oxidized form of nicotinamide adenine dinucleotidee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rapid desiccation was also associated with higher activities and levels of malate dehydrogenase and the oxidized form of nicotinamide adenine dinucleotide.”
t0“Pisum sativum”
Claim · model-written summary
Rapid desiccation was accompanied by lower hydroperoxide levels and membrane damage.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- Rapid desiccatione0
- Outcome
- hydroperoxide levels and membrane damagee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rapid desiccation was also associated with higher activities and levels of malate dehydrogenase and the oxidized form of nicotinamide adenine dinucleotide. It was also accompanied by lower hydroperoxide levels and membrane damage.”
t0“Pisum sativum”
Claim · model-written summary
Glutathione reductase activity was greater during rapid drying.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- rapid dryinge0
- Outcome
- activitiy of glutathione reductasee0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activitiy of glutathione reductase was greater during rapid drying.”
t0“Pisum sativum”
Claim · model-written summary
Radicle viability declined after two weeks of wet storage.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- wet storage after two weekse0
- Outcome
- viabilitye0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“viability declined even in wet storage after two weeks.”
t0“Pisum sativum”
Claim · model-written summary
Radicles were a useful model for desiccation sensitivity in plant tissues.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- useful model to study desiccation sensitivity in plant tissuese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“radicles are a useful model to study desiccation sensitivity in plant tissues.”
t0“Pisum sativum”
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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.