Abstract
25 Topic: Research Notes Key Author: Kirsten A. Thomsen Correspondence Address: The State Forest Tree Improvement Station Krogerupvej 21 3050 Humlebaek Denmark E-mail: kth@sns.dk Authors: K.A. Thomsen and E.N. Eriksen Effect of temperatures during seed development and pretreatment on seed dormancy of Malus sargentii and M. sieboldii Pages: 215-220 Eight pretreatment temperatures ranging from 0.5°C to 18.5°C were tested on two Malus sargentii seed lots. Temperatures above 9°C had no significant effect on seed dormancy, 0.5°C and 4.0°C were equally efficient in releasing the dormancy, but only seeds pretreated at 4°C germinated during pretreatment. To investigate the effect of temperature during seed development on the level of dormancy, two clones of M. sargentii and seed plants of Malus sieboldii were transferred after pollination to growth chambers at three different temperature regimes (normal mean temperature ± 3°C). Ripe fruits were harvested at three different dates. M. sieboldii plants and a third clone of M. sargentii were kept outside for comparison. Seed weights and moisture contents after harvest were determined, and germination was tested after pretreatment at 4°C for different periods. M. sargentii seeds developed at the highest temperature regime had higher seed weights, lower seed moisture contents and were less dormant than seeds developed at the lowest temperature regime. The difference in pretreatment needed to obtain maximum germination was 4-5 weeks. Twelve weeks pretreatment was sufficient to break dormancy in M. sieboldii seeds, but at least 15-16 weeks of pretreatment was needed to break the seed dormancy of M. sargentii.
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Claims 9
Claim · model-written summary
Pretreatment temperatures above 9°C had no significant effect on seed dormancy
- Taxon
- Malus sargentii
Malus sargentiie0 - Treatment
- Temperatures above 9°Ce1
- Outcome
- seed dormancye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eight pretreatment temperatures ranging from 0.5°C to 18.5°C were tested on two Malus sargentii seed lots”
e1“Temperatures above 9°C had no significant effect on seed dormancy, 0.5°C and 4.0°C were equally efficient in releasing the dormancy, but only seeds pretreated at 4°C germinated during pretreatment”
Claim · model-written summary
Pretreatment at 0.5°C and 4.0°C was equally efficient in releasing seed dormancy
- Taxon
- Malus sargentiiMalus sargentiie0
- Treatment
- 0.5°C and 4.0°Ce1
- Outcome
- releasing the dormancye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eight pretreatment temperatures ranging from 0.5°C to 18.5°C were tested on two Malus sargentii seed lots”
e1“Temperatures above 9°C had no significant effect on seed dormancy, 0.5°C and 4.0°C were equally efficient in releasing the dormancy, but only seeds pretreated at 4°C germinated during pretreatment”
Claim · model-written summary
Only seeds pretreated at 4°C germinated during pretreatment
- Taxon
- Malus sargentiiMalus sargentiie0
- Treatment
- pretreated at 4°Ce1
- Outcome
- germinated during pretreatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eight pretreatment temperatures ranging from 0.5°C to 18.5°C were tested on two Malus sargentii seed lots”
e1“Temperatures above 9°C had no significant effect on seed dormancy, 0.5°C and 4.0°C were equally efficient in releasing the dormancy, but only seeds pretreated at 4°C germinated during pretreatment”
Claim · model-written summary
Seeds developed at the highest temperature regime had higher seed weights than at the lowest regime
- Taxon
- M. sargentiiMalus sargentiie2
- Treatment
- highest temperature regimee2
- Outcome
- seed weightse2
- Direction
- highere2
- Comparator
- lowest temperature regimee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“M. sargentii seeds developed at the highest temperature regime had higher seed weights, lower seed moisture contents and were less dormant than seeds developed at the lowest temperature regime”
Claim · model-written summary
Seeds developed at the highest temperature regime had lower seed moisture contents than at the lowest regime
- Taxon
- M. sargentiiMalus sargentiie2
- Treatment
- highest temperature regimee2
- Outcome
- seed moisture contentse2
- Direction
- lowere2
- Comparator
- lowest temperature regimee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“M. sargentii seeds developed at the highest temperature regime had higher seed weights, lower seed moisture contents and were less dormant than seeds developed at the lowest temperature regime”
Claim · model-written summary
Seeds developed at the highest temperature regime were less dormant than at the lowest regime
- Taxon
- M. sargentiiMalus sargentiie2
- Treatment
- highest temperature regimee2
- Outcome
- seed dormancye1
- Direction
- less dormante2
- Comparator
- lowest temperature regimee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Temperatures above 9°C had no significant effect on seed dormancy, 0.5°C and 4.0°C were equally efficient in releasing the dormancy, but only seeds pretreated at 4°C germinated during pretreatment”
e2“M. sargentii seeds developed at the highest temperature regime had higher seed weights, lower seed moisture contents and were less dormant than seeds developed at the lowest temperature regime”
Claim · model-written summary
The difference in pretreatment needed for maximum germination was 4-5 weeks
- Taxon
- Malus sargentiiMalus sargentiie0
- Outcome
- maximum germinatione3
- Value
- 4-5 weekse3
- Qualifier
- The difference in pretreatment needede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eight pretreatment temperatures ranging from 0.5°C to 18.5°C were tested on two Malus sargentii seed lots”
e3“The difference in pretreatment needed to obtain maximum germination was 4-5 weeks”
Claim · model-written summary
Twelve weeks of pretreatment was sufficient to break dormancy in M. sieboldii seeds
- Taxon
- M. sieboldii
Malus sieboldiie4 - Outcome
- break dormancye4
- Value
- Twelve weekse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Twelve weeks pretreatment was sufficient to break dormancy in M. sieboldii seeds, but at least 15-16 weeks of pretreatment was needed to break the seed dormancy of M. sargentii”
Claim · model-written summary
At least 15-16 weeks of pretreatment was needed to break seed dormancy of M. sargentii
- Taxon
- M. sargentiiMalus sargentiie4
- Outcome
- break the seed dormancye4
- Value
- 15-16 weekse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Twelve weeks pretreatment was sufficient to break dormancy in M. sieboldii seeds, but at least 15-16 weeks of pretreatment was needed to break the seed dormancy of M. sargentii”