Abstract
Seed germinability and storability are important aspects of lettuce seed quality determined by the genotype and environment of seed development. The objective of this study was to determine how temperature of the mother plant environment affects lettuce seed quality. Seeds of cv. Tango were produced in growth chambers under one of two treatments: i) high temperature (HT), with day/night temperatures of 30/20°C, respectively, and ii) low temperature (LT), with temperatures of 20/10°C. Seeds produced at LT were 37% heavier than seed from HT, however germination at optimal conditions (20°C-light) was similar for both treatments. Seeds from HT presented higher dark germination at 18, 24 and 29°C. Germinability (% and rates) under light at temperatures between 20 and 30°C was similar for seeds from both treatments, however at temperatures between 30 and 40°C seeds from HT performed better than those from LT. When germinated at exogenous abscisic acid concentrations or negative osmotic potentials, germinability of seed from HT was less affected than LT. After accelerated aging (41°C, ~100%RH, 72 h), germination of normal seedlings was higher for seeds from HT. Germination after 1 and 2 months of storage at 30°C and 74% RH was better for seeds from HT. The critical moment for temperature effects was also studied. Seed weight, dark germination at 30°C and germination at low osmotic potential were shown to be determined earlier during seed development (before 5 and 4 d after flowering for seeds from LT and HT, respectively). On the other hand, seed storability was determined at the end of seed development, after physiological maturity (≈ 16 and 11 d after flowering for LT and HT seeds, respectively). In conclusion, higher ‘Tango’ lettuce seed germinability and storability results were attained when seeds were produced at higher temperatures.
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Claims 11
Claim · model-written summary
Low-temperature seeds were 37% heavier than high-temperature seeds.
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- LTe0
- Outcome
- Seeds producede0
- Direction
- heaviere0
- Value
- 37%e0
- Comparator
- HTe0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds produced at LT were 37% heavier than seed from HT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Optimal-condition germination was similar for both temperature treatments.
- Taxon
- lettuceLactuca sativae1
- Treatment
- both treatmentse0
- Outcome
- germinatione0
- Direction
- similare0
- Qualifier
- optimal conditions (20°C-light)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germination at optimal conditions (20°C-light) was similar for both treatments”
e1“aspects of lettuce seed quality”
Claim · model-written summary
High-temperature seeds had higher dark germination at 18, 24 and 29°C.
- Taxon
- lettuceLactuca sativae1
- Treatment
- HTe0
- Outcome
- dark germinatione0
- Direction
- highere0
- Qualifier
- 18, 24 and 29°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds from HT presented higher dark germination at 18, 24 and 29°C”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Light germination from 20 to 30°C was similar for both seed-production temperatures.
- Taxon
- lettuceLactuca sativae1
- Treatment
- both treatmentse0
- Outcome
- Germinability (% and rates)e0
- Direction
- similare0
- Qualifier
- temperatures between 20 and 30°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germinability (% and rates) under light at temperatures between 20 and 30°C was similar for seeds from both treatments”
e1“aspects of lettuce seed quality”
Claim · model-written summary
High-temperature seeds germinated better than low-temperature seeds at 30 to 40°C.
- Taxon
- lettuceLactuca sativae1
- Treatment
- HTe0
- Outcome
- seeds from HT performed bettere0
- Direction
- bettere0
- Qualifier
- temperatures between 30 and 40°Ce0
- Comparator
- LTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at temperatures between 30 and 40°C seeds from HT performed better than those from LT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Exogenous abscisic acid affected high-temperature seed germinability less than low-temperature seeds.
- Taxon
- lettuceLactuca sativae1
- Treatment
- exogenous abscisic acid concentrationse0
- Outcome
- germinability of seed from HTe0
- Direction
- less affectede0
- Comparator
- LTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When germinated at exogenous abscisic acid concentrations or negative osmotic potentials, germinability of seed from HT was less affected than LT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Negative osmotic potential affected high-temperature seed germinability less than low-temperature seeds.
- Taxon
- lettuceLactuca sativae1
- Treatment
- negative osmotic potentialse0
- Outcome
- germinability of seed from HTe0
- Direction
- less affectede0
- Comparator
- LTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When germinated at exogenous abscisic acid concentrations or negative osmotic potentials, germinability of seed from HT was less affected than LT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
After accelerated aging, high-temperature seeds had higher normal seedling germination.
- Taxon
- lettuceLactuca sativae1
- Treatment
- HTe0
- Outcome
- germination of normal seedlingse0
- Direction
- highere0
- Qualifier
- accelerated aging (41°C, ~100%RH, 72 h)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After accelerated aging (41°C, ~100%RH, 72 h), germination of normal seedlings was higher for seeds from HT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
High-temperature seeds germinated better after one and two months of storage.
- Taxon
- lettuceLactuca sativae1
- Treatment
- HTe0
- Outcome
- Germinatione0
- Direction
- bettere0
- Qualifier
- after 1 and 2 months of storage at 30°C and 74% RHe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination after 1 and 2 months of storage at 30°C and 74% RH was better for seeds from HT”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Seed weight, dark germination and low-osmotic-potential germination were set early in development.
- Taxon
- lettuceLactuca sativae1
- Organ / stage
- seed developmente0
- Outcome
- Seed weight, dark germination at 30°C and germination at low osmotic potentiale0
- Qualifier
- before 5 and 4 d after flowering for seeds from LT and HT, respectivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed weight, dark germination at 30°C and germination at low osmotic potential were shown to be determined earlier during seed development (before 5 and 4 d after flowering for seeds from LT and HT, respectively)”
e1“aspects of lettuce seed quality”
Claim · model-written summary
Seed storability was determined after physiological maturity.
- Taxon
- lettuceLactuca sativae1
- Organ / stage
- physiological maturitye0
- Outcome
- seed storabilitye0
- Qualifier
- ≈ 16 and 11 d after flowering for LT and HT seeds, respectivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed storability was determined at the end of seed development, after physiological maturity (≈ 16 and 11 d after flowering for LT and HT seeds, respectively)”
e1“aspects of lettuce seed quality”
The same questions in other papers
heat · soil: physics · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
heat · growth · Lactuca sativa (garden lettuce)Positive and negative results
6 papers in the same direction as this paper · 10 in the opposite direction
- negative
- negative
- negative
13 papers more in this group
See all 17 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.