Abstract
Time-to-event analysis, or survival analysis, is a method to analyse the timing of events and to quantify the effects of contributing factors. We apply this method to data on the timing of abortion of reproductive organs. This abortion often depends on source and sink strength. We hypothesise that the effect of source and sink strength on abortion rate can be quantified with a statistical model, obtained via survival analysis. Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed. Increasing the source strength as well as decreasing the sink strength decreased the abortion rate. The effect was non-linear, e.g. source strengths above 6g CH2O per plant per d did not decrease abortion rates further. The maximum abortion rate occurred around 100 degree-days after anthesis. Analyses in which sink strength was replaced with the number of fruits in a specified age category had an equal or better fit to the data. We discuss the advantages and disadvantages of using survival analyses for this kind of data. The technique can also be used for other crops showing reproductive organ abortion (e.g. soybean (Glycine max L.), cucumber (Cucumis sativus L.)), but also on other event types like bud break or germination.
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Claims 5
Claim · model-written summary
Increasing source strength decreased the abortion rate of Capsicum annuum flowers and fruits.
- Taxon
- Capsicum annuum
Capsicum annuume2 - Treatment
- Increasing the source strengthe0
- Outcome
- abortion ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the source strength as well as decreasing the sink strength decreased the abortion rate”
e2“Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed”
Claim · model-written summary
Decreasing sink strength decreased the abortion rate of Capsicum annuum flowers and fruits.
- Taxon
- Capsicum annuumCapsicum annuume2
- Treatment
- decreasing the sink strengthe0
- Outcome
- abortion ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the source strength as well as decreasing the sink strength decreased the abortion rate”
e2“Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed”
Claim · model-written summary
Source strengths above 6 g CH2O per plant per day did not decrease abortion rates further; the effect was non-linear.
- Taxon
- Capsicum annuumCapsicum annuume2
- Treatment
- source strengths above 6g CH2O per plant per de1
- Outcome
- abortion ratese1
- Direction
- did not decreasee1
- Qualifier
- non-lineare1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect was non-linear, e.g. source strengths above 6g CH2O per plant per d did not decrease abortion rates further”
e2“Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed”
Claim · model-written summary
The maximum abortion rate in Capsicum annuum occurred around 100 degree-days after anthesis.
- Taxon
- Capsicum annuumCapsicum annuume2
- Outcome
- maximum abortion ratee3
- Value
- around 100 degree-days after anthesise3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed”
e3“The maximum abortion rate occurred around 100 degree-days after anthesis”
Claim · model-written summary
Counting fruits in a specified age category gave an equal or better model fit than using sink strength.
- Taxon
- Capsicum annuumCapsicum annuume2
- Outcome
- fit to the datae4
- Comparator
- sink strengthe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Flower and fruit abortion in Capsicum annuum L., observed in temperature and planting density experiments, were analysed”
e4“Analyses in which sink strength was replaced with the number of fruits in a specified age category had an equal or better fit to the data”