Abstract
Vegetative propagation of strawberry (Fragaria × ananassa Duch.) in the plant factory with artificial lighting is considered as an effective approach to produce high-quality transplants. In this study, mother plants of ‘Benihoppe’ strawberry were grown hydroponically for 50 d under eight LED lighting treatments by combining four levels of light intensity (200, 250, 300 and 350 mol/(m2·s)) and two photoperiods (12 h/d and 16 h/d). Runner development, growth of runner plants, photon yield and energy yield in runners and runner plants were investigated to evaluate the strawberry propagation efficiency. Results indicated that length of runners decreased linearly with increasing daily light integral (DLI) under each photoperiod and was significantly shorter under photoperiod of 16 h/d. Runner elongation was inhibited by high DLI. Number of runners and runner plants formed by mother plants increased by 38.9% and 33.7%, when DLI increased from 8.6 to 11.5 mol/(m2·d), respectively; however, no further increase was observed when DLI was higher than 11.5 mol/(m2·d). Similar trends were found in crown diameter and biomass of primary and secondary runner plants. Negative impact of high DLI (20.2 mol/(m2·d)) on photosynthetic capacity of runner plants was observed as a decrease in leaf net photosynthetic rate, potential maximum photochemical efficiency of PSII, and chlorophyll content. Furthermore, photon yield and energy yield in runners and runner plants decreased significantly with increasing DLI. Therefore, DLI in a range of 11.5-17.3 mol/(m2·d) is beneficial to improve strawberry propagation efficiency and quality of runner plants, and 11.5 mol/(m2·d) is optimal for the strawberry propagation of runner plants in the LED plant factory because of the higher photon and energy yields. Keywords: hydroponic strawberry, vegetative propagation, daily light integral, photon yield DOI: 10.25165/j.ijabe.20191206.5265 Citation: Zheng J F, He D X, Ji F. Effects of light intensity and photoperiod on runner plant propagation of hydroponic strawberry transplants under LED lighting. Int J Agric & Biol Eng, 2019; 12(6): 26–31.
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Claims 10
Claim · model-written summary
Runner length decreased as DLI increased under each photoperiod.
Not reportedTaxon
Verbatim
e0“length of runners decreased linearly with increasing daily light integral (DLI) under each photoperiod”
Claim · model-written summary
Runners were significantly shorter at a 16 h/d photoperiod.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Treatment
- photoperiod of 16 h/de0
- Outcome
- shortere0
- Direction
- shortere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“was significantly shorter under photoperiod of 16 h/d”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Runner number increased 38.9% as DLI rose from 8.6 to 11.5 mol/(m2·d).
- Treatment
- DLI increased from 8.6 to 11.5 mol/(m2·d)e0
- Outcome
- Number of runnerse0
- Direction
- increasede0
- Value
- 38.9%e0
Not reportedTaxonComparator
Verbatim
e0“Number of runners and runner plants formed by mother plants increased by 38.9% and 33.7%, when DLI increased from 8.6 to 11.5 mol/(m2·d), respectively”
Claim · model-written summary
Runner plant number increased 33.7% as DLI rose from 8.6 to 11.5 mol/(m2·d).
- Treatment
- DLI increased from 8.6 to 11.5 mol/(m2·d)e0
- Outcome
- runner plants formed by mother plantse0
- Direction
- increasede0
- Value
- 33.7%e0
Not reportedTaxonComparator
Verbatim
e0“Number of runners and runner plants formed by mother plants increased by 38.9% and 33.7%, when DLI increased from 8.6 to 11.5 mol/(m2·d), respectively”
Claim · model-written summary
Runner and runner plant numbers did not increase further above 11.5 mol/(m2·d) DLI.
- Outcome
- no further increasee0
- Direction
- no further increasee0
- Qualifier
- DLI was higher than 11.5 mol/(m2·d)e0
Not reportedTaxon
Verbatim
e0“no further increase was observed when DLI was higher than 11.5 mol/(m2·d)”
Claim · model-written summary
Crown diameter and biomass of primary and secondary runner plants followed similar DLI trends.
Not reportedTaxonDirection
Verbatim
e0“Similar trends were found in crown diameter and biomass of primary and secondary runner plants.”
Claim · model-written summary
High DLI reduced leaf net photosynthetic rate, PSII efficiency and chlorophyll content.
- Treatment
- high DLI (20.2 mol/(m2·d))e0
- Outcome
- leaf net photosynthetic rate, potential maximum photochemical efficiency of PSII, and chlorophyll contente0
- Direction
- decreasee0
Not reportedTaxonComparator
Verbatim
e0“Negative impact of high DLI (20.2 mol/(m2·d)) on photosynthetic capacity of runner plants was observed as a decrease in leaf net photosynthetic rate, potential maximum photochemical efficiency of PSII, and chlorophyll content.”
Claim · model-written summary
Photon and energy yields in runners and runner plants decreased significantly with increasing DLI.
Not reportedTaxon
Verbatim
e0“photon yield and energy yield in runners and runner plants decreased significantly with increasing DLI”
Claim · model-written summary
The authors recommend 11.5–17.3 mol/(m2·d) DLI for strawberry propagation efficiency and runner plant quality.
- Taxon
- strawberryFragaria ×ananassae0
- Outcome
- DLI in a range of 11.5-17.3 mol/(m2·d)e0
- Qualifier
- propagation efficiency and quality of runner plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DLI in a range of 11.5-17.3 mol/(m2·d) is beneficial to improve strawberry propagation efficiency and quality of runner plants”
Claim · model-written summary
The authors identify 11.5 mol/(m2·d) as optimal DLI in the LED plant factory.
- Taxon
- strawberryFragaria ×ananassae0
- Outcome
- 11.5 mol/(m2·d)e0
- Qualifier
- higher photon and energy yieldse0
- Setting
- LED plant factorye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“11.5 mol/(m2·d) is optimal for the strawberry propagation of runner plants in the LED plant factory because of the higher photon and energy yields”
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