Abstract
Dormancy shows common physiological features in buds and seeds. Specific period of chilling is usually required to release dormancy. Reproductive meristems and embryos display dormancy mechanisms in specialized structures named respectively buds and seeds that arrest the growth of perennial plants until environmental conditions are optimal for survival. Chilling requirements for breaking dormancy were studied for 3 successive years in 20 seedling apricot trees which spanned the range of flowering times in these trees. Different methods for estimating chilling requirements were evaluated and compared, and correlations between chilling requirements and flowering date were established. The trees examined showed a range of chilling requirements, chill hours (CH) between 199 CH and 274 CH, and chill units, (CU), between 612CU and 873CU. The results obtained in different years by the Utah and Dynamic models were more homogeneous with respect to the hours below 7 °C model. The apricot trees showed important differences concerning flowering date, and the results indicate a high positive correlation between chilling requirements and flowering date.Moreover, a specific low-temperature stratification treatment was required to overcome seed dormancy. 5°C cold stratification was found to be the best for breaking seed dormancy and germination. Increased seed germination percentage was recorded when the period of stratification prolonged. Apricot seeds required a cold stratification of about 12-15 days to reach maximum germination.
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Claims 8
Claim · model-written summary
Apricot trees varied in chilling requirement from 199 to 274 chill hours.
- Taxon
- apricot
Prunus armeniacat0 - Outcome
- chilling requirementse0
- Value
- 199 CH and 274 CHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The trees examined showed a range of chilling requirements, chill hours (CH) between 199 CH and 274 CH”
t0“Apricot”
Claim · model-written summary
Apricot trees varied in chilling requirement from 612 to 873 chill units.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- chill unitse0
- Value
- 612CU and 873CUe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and chill units, (CU), between 612CU and 873CU”
t0“Apricot”
Claim · model-written summary
Utah and Dynamic model estimates were more homogeneous across years than hours below 7 °C estimates.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- results obtained in different yearse0
- Direction
- more homogeneouse0
- Comparator
- hours below 7 °C modele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results obtained in different years by the Utah and Dynamic models were more homogeneous with respect to the hours below 7 °C model”
t0“Apricot”
Claim · model-written summary
Apricot chilling requirements were highly positively correlated with flowering date.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- flowering datee0
- Direction
- positivee0
- Comparator
- chilling requirementse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the results indicate a high positive correlation between chilling requirements and flowering date”
t0“Apricot”
Claim · model-written summary
Low-temperature stratification was required to overcome apricot seed dormancy.
- Taxon
- apricotPrunus armeniacat0
- Treatment
- low-temperature stratification treatmente0
- Outcome
- seed dormancye0
- Direction
- overcomee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a specific low-temperature stratification treatment was required to overcome seed dormancy”
t0“Apricot”
Claim · model-written summary
Stratification at 5°C was best for apricot seed dormancy breaking and germination.
- Taxon
- apricotPrunus armeniacat0
- Treatment
- 5°C cold stratificatione0
- Outcome
- breaking seed dormancy and germinatione0
- Direction
- beste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“5°C cold stratification was found to be the best for breaking seed dormancy and germination”
t0“Apricot”
Claim · model-written summary
Longer stratification increased apricot seed germination percentage.
- Taxon
- apricotPrunus armeniacat0
- Treatment
- period of stratificatione0
- Outcome
- seed germination percentagee0
- Direction
- Increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased seed germination percentage was recorded when the period of stratification prolonged”
t0“Apricot”
Claim · model-written summary
Apricot seeds reached maximum germination after about 12-15 days of cold stratification.
- Taxon
- ApricotPrunus armeniacae0
- Treatment
- cold stratification of about 12-15 dayse0
- Outcome
- germinatione0
- Direction
- maximume0
- Value
- 12-15 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apricot seeds required a cold stratification of about 12-15 days to reach maximum germination”
The same questions in other papers
cold · growth · Prunus armeniaca (apricot)Positive and negative results
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- positive
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2 papers more in this group
See all 6 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.