Abstract
As the source of energy and biology signals, light can influence the healing process of grafted seedlings by regulating the synthesis of the endogenous hormone, regeneration of wound-healing tissue, and connection of vascular tissue in grafted seedlings. The effect of daily light integral (DLI) on the healing process and seedling quality of tomato (Solanum lycopersicum L.) was analyzed in this study, with the comparison of grafted seedlings treated in dark for 7 d after grafting. The results showed that the height increment of scion and rootstock, adhesion of graft union, stem flow, total chlorophyll content, and net photosynthesis rate increased gradually with increasing light intensity, and no longer increased significantly when the DLI was higher than 5.04 mol/m2•d. The contents of auxin (IAA) and gibberellin (GA) in tomato leaves increase and abscisic acid (ABA) decreases with the increase of DLI. However, there was no significant difference between the treatments with DLI higher than 6.48 mol/m2•d. Both the biomass and energy use efficiency (EUE) of grafted seedlings increased with DLI in a certain range and then decreased. The biomass was the largest when DLI was 5.04 mol/m2•d. However, EUE was highest when DLI was 7.46 mol/m2•d. In conclusion, a suitable DLI is beneficial to cultivate high-quality grafted tomato seedlings, and increasing DLI within a certain range can promote biomass accumulation, connection of vascular tissue, endogenous hormone biosynthesis in tomato grafted seedlings during healing period. The lighting environment with DLI of 5.04 mol/m2•d (light intensity of 100 μmol/m2•s and light time of 14 h/d) is recommended for the healing treatment in high-quality production, which also improves EUE during the healing period of tomato grafted seedlings. Keywords: stress resistance, endogenous hormones, stem flow, energy use efficiency, seedling index DOI: 10.25165/j.ijabe.20221506.7409 Citation: Song J X, Fan Y L, Li X Q, Li Y Z, Mao H P, Zuo Z Y, et al. Effects of daily light integral on tomato (Solanum Lycopersicon L.) grafting and quality in a controlled environment. Int J Agric & Biol Eng, 2022; 15(6): 44–50.
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Claims 9
Claim · model-written summary
Scion and rootstock height increments increased with light intensity until a DLI above 5.04 mol/m2•d.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- increasing light intensitye0
- Outcome
- height increment of scion and rootstocke0
- Direction
- increasede0
- Value
- 5.04 mol/m2•de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“height increment of scion and rootstock, adhesion of graft union, stem flow, total chlorophyll content, and net photosynthesis rate increased gradually with increasing light intensity, and no longer increased significantly when the DLI was higher than 5.04 mol/m2•d”
t0“tomato”
Claim · model-written summary
Graft union adhesion increased with light intensity until a DLI above 5.04 mol/m2•d.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- increasing light intensitye0
- Outcome
- adhesion of graft unione0
- Direction
- increasede0
- Value
- 5.04 mol/m2•de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adhesion of graft union, stem flow, total chlorophyll content, and net photosynthesis rate increased gradually with increasing light intensity, and no longer increased significantly when the DLI was higher than 5.04 mol/m2•d”
t0“tomato”
Claim · model-written summary
Stem flow, chlorophyll content, and photosynthesis increased with light intensity until a DLI above 5.04 mol/m2•d.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- increasing light intensitye0
- Outcome
- stem flow, total chlorophyll content, and net photosynthesis ratee0
- Direction
- increasede0
- Value
- 5.04 mol/m2•de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem flow, total chlorophyll content, and net photosynthesis rate increased gradually with increasing light intensity, and no longer increased significantly when the DLI was higher than 5.04 mol/m2•d”
t0“tomato”
Claim · model-written summary
Leaf IAA and GA increased with DLI.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- increase of DLIe0
- Outcome
- contents of auxin (IAA) and gibberellin (GA) in tomato leavese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“contents of auxin (IAA) and gibberellin (GA) in tomato leaves increase and abscisic acid (ABA) decreases with the increase of DLI”
Claim · model-written summary
Leaf ABA decreased with DLI.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- increase of DLIe0
- Outcome
- abscisic acid (ABA)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“abscisic acid (ABA) decreases with the increase of DLI”
t0“tomato”
Claim · model-written summary
DLI treatments above 6.48 mol/m2•d showed no significant difference in hormone contents.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- DLI higher than 6.48 mol/m2•de0
- Outcome
- no significant differencee0
- Direction
- no significant differencee0
- Comparator
- the treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant difference between the treatments with DLI higher than 6.48 mol/m2•d”
t0“tomato”
Claim · model-written summary
Grafted seedling biomass rose and then fell as DLI increased, peaking at 5.04 mol/m2•d.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- DLIe0
- Outcome
- biomasse0
- Direction
- increasede0
- Value
- 5.04 mol/m2•de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the biomass and energy use efficiency (EUE) of grafted seedlings increased with DLI in a certain range and then decreased. The biomass was the largest when DLI was 5.04 mol/m2•d”
t0“tomato”
Claim · model-written summary
Energy use efficiency rose and then fell as DLI increased, peaking at 7.46 mol/m2•d.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- DLIe0
- Outcome
- energy use efficiency (EUE)e0
- Direction
- increasede0
- Value
- 7.46 mol/m2•de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“energy use efficiency (EUE) of grafted seedlings increased with DLI in a certain range and then decreased. The biomass was the largest when DLI was 5.04 mol/m2•d. However, EUE was highest when DLI was 7.46 mol/m2•d”
t0“tomato”
Claim · model-written summary
The authors recommend 5.04 mol/m2•d DLI for healing tomato grafts in high-quality production.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- DLI of 5.04 mol/m2•de0
- Outcome
- healing treatment in high-quality productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lighting environment with DLI of 5.04 mol/m2•d (light intensity of 100 μmol/m2•s and light time of 14 h/d) is recommended for the healing treatment in high-quality production”
t0“tomato”
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