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 fell linearly as DLI increased under each photoperiod.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Organ / stage
- runnerse0
- Treatment
- increasing daily light integral (DLI)e0
- Outcome
- length of runnerse0
- Direction
- decreased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“length of runners decreased linearly with increasing daily light integral (DLI) under each photoperiod”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Runners were significantly shorter under a 16 h/d photoperiod.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- photoperiod of 16 h/de0
- Outcome
- length of runnerse1
- Direction
- shortere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was significantly shorter under photoperiod of 16 h/d”
e1“length of runners”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Increasing DLI from 8.6 to 11.5 mol/(m2·d) raised runner number by 38.9%.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- DLI increased from 8.6 to 11.5 mol/(m2·d)e0
- Outcome
- Number of runnerse0
- Direction
- increasede0
- Value
- 38.9%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Increasing DLI from 8.6 to 11.5 mol/(m2·d) raised runner-plant number by 33.7%.
- Taxon
- strawberryFragaria ×ananassat0
- 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 reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Runner and runner-plant numbers did not increase further above 11.5 mol/(m2·d).
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- DLI was higher than 11.5 mol/(m2·d)e0
- Outcome
- Number of runners and runner plants formed by mother plantse1
- Direction
- no further increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no further increase was observed when DLI was higher than 11.5 mol/(m2·d)”
e1“Number of runners and runner plants formed by mother plants”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Primary and secondary runner plants showed similar DLI trends in crown diameter and biomass.
- Taxon
- strawberryFragaria ×ananassat0
- Organ / stage
- primary and secondary runner plantse0
- Treatment
- DLIe1
- Outcome
- crown diameter and biomasse0
- Direction
- Similar trendse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar trends were found in crown diameter and biomass of primary and secondary runner plants.”
e1“when DLI increased from 8.6 to 11.5 mol/(m2·d)”
t0“hydroponic strawberry transplants”
Claim · model-written summary
High DLI lowered leaf photosynthetic rate, PSII efficiency and chlorophyll content in runner plants.
- Taxon
- strawberryFragaria ×ananassat0
- 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 reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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.”
t0“hydroponic strawberry transplants”
Claim · model-written summary
Photon and energy yields in runners and runner plants significantly declined with increasing DLI.
- Taxon
- strawberryFragaria ×ananassat0
- Treatment
- increasing DLIe0
- Outcome
- photon yield and energy yield in runners and runner plantse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photon yield and energy yield in runners and runner plants decreased significantly with increasing DLI.”
t0“hydroponic strawberry transplants”
Claim · model-written summary
The authors recommend 11.5–17.3 mol/(m2·d) DLI to improve strawberry propagation and runner quality.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- DLI in a range of 11.5-17.3 mol/(m2·d)e0
- Outcome
- strawberry 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 factory because photon and energy yields are higher.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- 11.5 mol/(m2·d)e0
- Outcome
- strawberry propagation of runner plantse0
- 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”
The same questions in other papers
light · physiology: photosynthesis · Fragaria x ananassa (strawberry)Positive and negative results
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