Abstract
Watermelon [Citrullus lanatus (Thunb.) Matsum. and Nakai] plug seedlings were stored at 15°C in the light at a photosynthetic photon flux density of 15 µmol·m(-2)·s(-1) or in darkness for 6 days, to evaluate their chloroplast ultrastructure, and associated photosynthetic characteristics. Storage in the dark caused swelling, disordered granal arrangement, and starch grain disappearance in the chloroplasts. In contrast, the chloroplasts stored in the light were relatively normal. As a result, the light-stored seedlings had a significantly higher chlorophyll content, Fv/Fm, and Pn than did dark-stored seedlings. Regardless of whether the seedlings were stored in light or darkness, the Gs and Ls of the seedlings significantly decreased, while the Ci obviously increased when the Pn decreased after 6 days of storage. This result suggests that the decreased Pn is not solely a stomatal effect, as the effects on the chloroplasts contributed to this photosynthetic inhibition. Six days after transplanting, seedlings that were stored in the light or darkness for 2 or 4 days showed complete recovery of chloroplast ultrastructure, chlorophyll content, Fv/Fm, Gs and Pn. When the storage period increased to 6 days, the dark-stored seedlings had a significantly lower Fv/Fm and Pn than the light-stored and control seedlings 6 days after transplanting, which was mainly ascribed to incomplete recovery of chloroplast ultrastructure. Furthermore, the light-stored seedlings exhibited a significantly higher shoot dry weight during storage and a higher percentage dry weight increase after transplanting than the dark-stored seedlings. These effects were enhanced by prolonged storage (4 to 6 days). This study demonstrated that dim light during storage is beneficial for maintaining chloroplast ultrastructure as well as photosynthetic efficiency in watermelon seedlings, thus contributing to the rapid recovery of post-storage photosynthetic performance, which ensures the transplant quality of the seedlings after removal from storage.
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Claims 8
Claim · model-written summary
Dark storage caused swollen, disordered chloroplasts and loss of starch grains.
- Taxon
- Watermelon
Citrullus lanatust0 - Treatment
- Storage in the darke0
- Outcome
- swelling, disordered granal arrangement, and starch grain disappearancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage in the dark caused swelling, disordered granal arrangement, and starch grain disappearance in the chloroplasts.”
t0“Watermelon”
Claim · model-written summary
Light-stored seedlings had higher chlorophyll content, Fv/Fm and Pn than dark-stored seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- light-storede0
- Outcome
- chlorophyll content, Fv/Fm, and Pne0
- Direction
- highere0
- Comparator
- dark-stored seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-stored seedlings had a significantly higher chlorophyll content, Fv/Fm, and Pn than did dark-stored seedlings.”
t0“Watermelon”
Claim · model-written summary
Gs and Ls declined after six days of storage in either light condition.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- Gs and Lse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gs and Ls of the seedlings significantly decreased”
t0“Watermelon”
Claim · model-written summary
Ci rose after six days of storage as Pn declined.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- Cie0
- Direction
- increasede0
- Qualifier
- after 6 days of storagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ci obviously increased when the Pn decreased after 6 days of storage.”
t0“Watermelon”
Claim · model-written summary
Seedlings stored two or four days recovered chloroplast structure and photosynthetic traits after transplanting.
- Taxon
- WatermelonCitrullus lanatust0
- Outcome
- chloroplast ultrastructure, chlorophyll content, Fv/Fm, Gs and Pne0
- Direction
- complete recoverye0
- Qualifier
- 2 or 4 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings that were stored in the light or darkness for 2 or 4 days showed complete recovery of chloroplast ultrastructure, chlorophyll content, Fv/Fm, Gs and Pn.”
t0“Watermelon”
Claim · model-written summary
After six days of dark storage, transplanted seedlings had lower Fv/Fm and Pn than light-stored and control seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- dark-storede0
- Outcome
- Fv/Fm and Pne0
- Direction
- lowere0
- Comparator
- light-stored and control seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dark-stored seedlings had a significantly lower Fv/Fm and Pn than the light-stored and control seedlings 6 days after transplanting”
t0“Watermelon”
Claim · model-written summary
Light-stored seedlings gained more shoot dry weight during storage than dark-stored seedlings.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- light-storede0
- Outcome
- shoot dry weight during storagee0
- Direction
- highere0
- Comparator
- dark-stored seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-stored seedlings exhibited a significantly higher shoot dry weight during storage and a higher percentage dry weight increase after transplanting than the dark-stored seedlings.”
t0“Watermelon”
Claim · model-written summary
Light-stored seedlings had a greater percentage dry weight gain after transplanting.
- Taxon
- WatermelonCitrullus lanatust0
- Treatment
- light-storede0
- Outcome
- percentage dry weight increase after transplantinge0
- Direction
- highere0
- Comparator
- dark-stored seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-stored seedlings exhibited a significantly higher shoot dry weight during storage and a higher percentage dry weight increase after transplanting than the dark-stored seedlings.”
t0“Watermelon”
The same questions in other papers
light · growth · Citrullus lanatus (watermelon)Results differ
20 papers in the same direction as this paper · 11 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- negative
29 papers more in this group
See all 33 papers →light · quality: sugar starch · Citrullus lanatus (watermelon)Positive and negative results
2 in the opposite direction
- positive
- positive
light · physiology: photosynthesis · Citrullus lanatus (watermelon)Positive and negative results
6 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 papers →storage · quality: sugar starch · Citrullus lanatus (watermelon)Results agree
1 paper in the same direction as this paper
- no effect
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.