Abstract
Fruit set is a crucial plant developmental process, determining yield in many crops. Pepper (Capsicum annuum L.) is a crop with poor fruit set as typically about two-thirds of all flowers abort. A higher light integral improves fruit set. However, the role of light spectrum has hardly been investigated. Opportunities for detailed investigation of light spectrum effects on fruit set have strongly increased with the introduction of narrow-band LED lighting. To investigate whether additional far-red light (FR) influences the fruit set of sweet pepper, a climate chamber experiment was conducted. Four light treatments were applied to pepper plants grown under 130 µmol m−2 s−1 of red/white LED light. Treatments consisted of different intensities of FR (0, 50, 100 µmol m−2 s−1) applied throughout the day or applied at the end of day (EOD, 30 min, 30 µmol m−2 s−1). Treatments resulted in phytochrome photostationary state (PSS) values of 0.88, 0.77. 0.70 and EOD 0.16, respectively. Fruit set was determined 3 weeks after the last anthesis of the studied flowers. Additional FR light reduced fruit set in sweet pepper, regardless of whether FR light was provided during the whole day or only at the end of the day. Meanwhile, FR led to more stem elongation, more upright branches, and more dry mass partitioning to stems. Additional FR during the daytime increased total shoot dry weight but not when FR was applied at the end of day. Possible reasons for stimulated flower and fruit abortion by additional FR are discussed.
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Claims 6
Claim · model-written summary
Additional far-red light reduced sweet pepper fruit set whether supplied all day or at day end.
- Taxon
- sweet pepper
Capsicum annuume0 - Treatment
- Additional FR lighte0
- Outcome
- fruit sete0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional FR light reduced fruit set in sweet pepper, regardless of whether FR light was provided during the whole day or only at the end of the day”
Claim · model-written summary
Far-red light increased stem elongation.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- FRe0
- Outcome
- stem elongatione0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet pepper (Capsicum annuum L.)”
e0“FR led to more stem elongation”
Claim · model-written summary
Far-red light produced more upright branches.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- FRe0
- Outcome
- upright branchese0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet pepper (Capsicum annuum L.)”
e0“FR led to more stem elongation, more upright branches”
Claim · model-written summary
Far-red light increased dry mass partitioning to stems.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- FRe0
- Outcome
- dry mass partitioning to stemse0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet pepper (Capsicum annuum L.)”
e0“FR led to more stem elongation, more upright branches, and more dry mass partitioning to stems”
Claim · model-written summary
Daytime far-red light increased total shoot dry weight.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- Additional FR during the daytimee0
- Outcome
- total shoot dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet pepper (Capsicum annuum L.)”
e0“Additional FR during the daytime increased total shoot dry weight”
Claim · model-written summary
End-of-day far-red light did not increase total shoot dry weight.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- FR was applied at the end of daye0
- Outcome
- total shoot dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet pepper (Capsicum annuum L.)”
e0“Additional FR during the daytime increased total shoot dry weight but not when FR was applied at the end of day”
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See all 23 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.