Abstract
S ummary Seeds of two cultivars of lettuce ( Lactuca sativa L.), untreated or soaked in acetone containing kinetin and gibberellic acid (K + GA 3 ), were germinated in light or dark at a range of (high) temperatures and at a range of water potentials. In addition, untreated and treated seeds were germinated at 20°C in the light and then transferred to the same high temperatures or to low water potentials. In both cvs light and K + GA 3 promoted germination at high temperatures and at low water potentials, although the cvs differed quantitatively in their responses. The upper temperature limit of germination in the light, and of radicle growth after germination, were similar in treated and untreated seeds respectively, suggesting that light and K + GA 3 in combination may have completely removed the specific high‐temperature block to germination. Although light and K + GA 3 increased the tolerance of germination to water stress, germinated, untreated seeds were able to grow at even lower water potentials. The K + GA 3 treatment, whilst promoting germination under high temperature or water stress, reduced radicle growth subsequent to germination, thus providing support for the possibility that, in germination, the initiation of cell elongation has a degree of metabolic independence of the other processes associated with growth.
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Claims 6
Claim · model-written summary
Light promoted lettuce germination at high temperatures and low water potentials.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- lighte0
- Outcome
- germinatione0
- Direction
- promotede0
- Qualifier
- high temperatures and at low water potentialse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cvs light and K + GA 3 promoted germination at high temperatures and at low water potentials, although the cvs differed quantitatively in their responses.”
t0“LETTUCE”
Claim · model-written summary
K + GA 3 promoted lettuce germination under high temperature and water stress, with cultivar differences in response size.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- K + GA 3e0
- Outcome
- germinatione0
- Direction
- promotede0
- Qualifier
- although the cvs differed quantitatively in their responsese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cvs light and K + GA 3 promoted germination at high temperatures and at low water potentials, although the cvs differed quantitatively in their responses.”
t0“LETTUCE”
Claim · model-written summary
Upper temperature limits for germination in light and radicle growth after germination were similar in treated and untreated seeds, respectively.
- Taxon
- LETTUCELactuca sativat0
- Outcome
- upper temperature limit of germination in the light, and of radicle growth after germinatione0
- Direction
- similare0
- Comparator
- treated and untreated seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The upper temperature limit of germination in the light, and of radicle growth after germination, were similar in treated and untreated seeds respectively”
t0“LETTUCE”
Claim · model-written summary
Light and K + GA 3 increased tolerance of lettuce germination to water stress.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- light and K + GA 3e0
- Outcome
- tolerance of germination to water stresse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although light and K + GA 3 increased the tolerance of germination to water stress”
t0“LETTUCE”
Claim · model-written summary
Germinated untreated lettuce seeds grew at lower water potentials than those tolerated during germination.
- Taxon
- LETTUCELactuca sativat0
- Material
- untreated seedse0
- Outcome
- grow at even lower water potentialse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germinated, untreated seeds were able to grow at even lower water potentials.”
t0“LETTUCE”
Claim · model-written summary
K + GA 3 reduced radicle growth after germination.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- K + GA 3 treatmente0
- Outcome
- radicle growth subsequent to germinatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The K + GA 3 treatment, whilst promoting germination under high temperature or water stress, reduced radicle growth subsequent to germination”
t0“LETTUCE”
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