Abstract
Illumination during storage was proven to extend the storability of seedlings, but little attention has been given to the underlying mechanism. To determine how light conditions affect photosynthetic status in watermelon [ Citrullus lanatus (Thunb.) Matsum. and Nakai] plug seedlings, differences of stomatal development and relative photosynthetic characteristics of expanding new leaves when stored for 8 days at 15 °C in light at a photosynthetic photon flux ( PPF ) of 15 μmol·m −2 ·s −1 or darkness were investigated. The stomatal density (SD) increased with time to a peak and then decreased from the start of storage in light to the subsequent transplantation. Dark storage retarded the stomatal development and delayed the appearance of the peak of SD. Compared with those under dark storage, light-stored seedlings showed significantly higher SD and stomatal index (SI) in leaves accompanied by higher maximal photochemical efficiency of PSII (F v /F m ) and quantum yield of PSII (ΦPSII). During storage in darkness, F v /F m and ΦPSII declined steeply with increasing storage duration but recovered gradually to reach the same level of those in light at the fourth day after transplanting. Seedlings stored in light for 8 days showed higher net photosynthesis rate (Pn), stomatal conductance ( g S ), intercellular CO 2 concentration (Ci), and transpiration rate (Tr) than in darkness. The post-storage recovery of Pn, g S , and Tr were closely related to the SI, which ensured the fast recovery of photosynthesis during the early stage of transplanting. In agreement with the change of SD, no differences in Pn, g S , Ci, and Tr between light and dark storage were observed after 8 days of transplantation. Seedlings stored in light appeared vigorous and the shoot dry weight was significantly higher than that of dark-stored ones. Although seedlings in dark storage had a poor appearance during storage, they showed inhibited regrowth potentials during the subsequent transplanting stage. This study exhibited that light in short-term storage contributed to maintaining stomatal development as well as photosynthetic efficiency in watermelon, which could also extend to post-storage for ensuring the transplant quality of seedlings after removal from storage.
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Claims 11
Claim · model-written summary
Stomatal density rose to a peak and then declined from light storage through transplanting.
- Taxon
- Watermelon
Citrullus lanatust0 - Treatment
- storage in lighte0
- Outcome
- stomatal density (SD)e0
- Direction
- increased with time to a peak and then decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal density (SD) increased with time to a peak and then decreased from the start of storage in light to the subsequent transplantation”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Dark storage delayed stomatal development and its density peak.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- Dark storagee0
- Outcome
- stomatal developmente0
- Direction
- retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark storage retarded the stomatal development and delayed the appearance of the peak of SD”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Light stored seedlings had significantly higher stomatal density and index than dark stored seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Organ / stage
- leavese0
- Treatment
- light-stored seedlingse0
- Outcome
- SD and stomatal index (SI)e0
- Direction
- highere0
- Comparator
- dark storagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with those under dark storage, light-stored seedlings showed significantly higher SD and stomatal index (SI) in leaves”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Light stored seedlings had higher PSII maximal efficiency and quantum yield than dark stored seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- light-stored seedlingse0
- Outcome
- maximal photochemical efficiency of PSII (F v /F m ) and quantum yield of PSII (ΦPSII)e0
- Direction
- highere0
- Comparator
- dark storagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with those under dark storage, light-stored seedlings showed significantly higher SD and stomatal index (SI) in leaves accompanied by higher maximal photochemical efficiency of PSII (F v /F m ) and quantum yield of PSII (ΦPSII)”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
In darkness, PSII efficiency and quantum yield declined with storage duration and recovered to light stored levels four days after transplanting.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- storage in darknesse0
- Outcome
- F v /F m and ΦPSIIe0
- Direction
- declined steeplye0
- Qualifier
- recovered gradually to reach the same level of those in light at the fourth day after transplantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During storage in darkness, F v /F m and ΦPSII declined steeply with increasing storage duration but recovered gradually to reach the same level of those in light at the fourth day after transplanting”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Eight days of light storage produced higher net photosynthesis, stomatal conductance and intercellular CO2 than dark storage.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- stored in light for 8 dayse0
- Outcome
- net photosynthesis rate (Pn), stomatal conductance ( g S ), intercellular CO 2 concentration (Ci)e0
- Direction
- highere0
- Comparator
- darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings stored in light for 8 days showed higher net photosynthesis rate (Pn), stomatal conductance ( g S ), intercellular CO 2 concentration (Ci), and transpiration rate (Tr) than in darkness”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Eight days of light storage produced higher transpiration than dark storage.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- stored in light for 8 dayse0
- Outcome
- transpiration rate (Tr)e0
- Direction
- highere0
- Comparator
- darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings stored in light for 8 days showed higher net photosynthesis rate (Pn), stomatal conductance ( g S ), intercellular CO 2 concentration (Ci), and transpiration rate (Tr) than in darkness”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Recovery of photosynthesis, conductance and transpiration after storage was closely related to stomatal index.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- post-storage recovery of Pn, g S , and Tre0
- Qualifier
- closely related to the SIe0
- Comparator
- SIe0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The post-storage recovery of Pn, g S , and Tr were closely related to the SI”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Eight days after transplantation, photosynthesis, conductance, intercellular CO2 and transpiration no longer differed by storage light.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- lighte0
- Outcome
- Pn, g S , Ci, and Tre0
- Direction
- no differencese0
- Qualifier
- after 8 days of transplantatione0
- Comparator
- dark storagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no differences in Pn, g S , Ci, and Tr between light and dark storage were observed after 8 days of transplantation”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Light stored seedlings appeared vigorous and had significantly higher shoot dry weight than dark stored seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Organ / stage
- shoote0
- Treatment
- stored in lighte0
- Outcome
- shoot dry weighte0
- Direction
- highere0
- Comparator
- dark-stored onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings stored in light appeared vigorous and the shoot dry weight was significantly higher than that of dark-stored ones”
t0“Watermelon (Citrullus lanatus)”
Claim · model-written summary
Dark stored seedlings had inhibited regrowth after transplantation.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- inhibited regrowth potentialse0
- Direction
- inhibitede0
- Qualifier
- during the subsequent transplanting stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they showed inhibited regrowth potentials during the subsequent transplanting stage”
t0“Watermelon (Citrullus lanatus)”
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