Abstract
Maize (Zea mays L.) seedlings of two cultivars (cv. Bastion adapted to W. Europe, and cv. Batan 8686 adapted to the highlands of Mexico), raised in a glasshouse (19-25 °C), were transferred to 4.5 or 9 °C at photon flux density (PPFD) of 950 µmol m-2 s-1 with 10-h photoperiod for 58 h and then allowed to recover at 22 °C for 16 h (14 h dark and 2 h at PPFD of 180 µmol m-2 s-1). The ultrastructural responses after 4 h or 26 h at 4.5 °C were the disappearance of starch grains in the bundle sheath chloroplasts and the contraction of intrathylakoid spaces in stromal thylakoids of the mesophyll chloroplasts. At this time, bundle sheath chloroplasts of cv. Batan 8686 formed peripheral reticulum. Prolonged stress at 4.5 °C (50 h) caused plastid swelling and the dilation of intrathylakoid spaces, mainly in mesophyll chloroplasts. Bundle sheath chloroplasts of cv. Batan 8686 seedlings appeared well preserved in shape and structure. Batan 8686 had also higher net photosynthetic rates during chilling and recovery than Bastion. Extended leaf photobleaching developed during the recovery period after chilling at 4.5 °C. This was associated with collapsed chloroplast envelopes, disintegrated chloroplasts and very poor staining.
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Claims 8
Claim · model-written summary
Chilling caused disappearance of starch grains in bundle sheath chloroplasts of maize.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e1“the disappearance of starch grains in the bundle sheath chloroplasts”
Claim · model-written summary
Chilling caused contraction of intrathylakoid spaces in stromal thylakoids of mesophyll chloroplasts.
- Organ / stage
- stromal thylakoids of the mesophyll chloroplastse2
- Outcome
- contraction of intrathylakoid spacese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e2“the contraction of intrathylakoid spaces in stromal thylakoids of the mesophyll chloroplasts”
Claim · model-written summary
Bundle sheath chloroplasts of cultivar Batan 8686 formed peripheral reticulum under chilling.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e3“bundle sheath chloroplasts of cv. Batan 8686 formed peripheral reticulum”
Claim · model-written summary
Prolonged chilling caused plastid swelling and dilation of intrathylakoid spaces, mainly in mesophyll chloroplasts.
- Organ / stage
- mesophyll chloroplastse4
- Outcome
- plastid swelling and the dilation of intrathylakoid spacese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e4“caused plastid swelling and the dilation of intrathylakoid spaces, mainly in mesophyll chloroplasts”
Claim · model-written summary
Bundle sheath chloroplasts of cultivar Batan 8686 appeared well preserved in shape and structure.
- Material
- Batan 8686e5
- Organ / stage
- Bundle sheath chloroplastse5
- Outcome
- shape and structuree5
- Qualifier
- well preservede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e5“Bundle sheath chloroplasts of cv. Batan 8686 seedlings appeared well preserved in shape and structure”
Claim · model-written summary
Cultivar Batan 8686 had higher net photosynthetic rates than Bastion during chilling and recovery.
- Material
- Batan 8686e6
- Treatment
- chillinge6
- Outcome
- net photosynthetic ratese6
- Direction
- highere6
- Comparator
- Bastione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e6“Batan 8686 had also higher net photosynthetic rates during chilling and recovery than Bastion”
Claim · model-written summary
Extended leaf photobleaching developed in maize during recovery after chilling.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e7“Extended leaf photobleaching developed during the recovery period after chilling”
Claim · model-written summary
Chilling-associated photobleaching was accompanied by collapsed chloroplast envelopes, disintegrated chloroplasts and very poor staining.
- Outcome
- collapsed chloroplast envelopes, disintegrated chloroplasts and very poor staininge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) seedlings of two cultivars”
e1“This was associated with collapsed chloroplast envelopes, disintegrated chloroplasts and very poor staining”
The same questions in other papers
cold · physiology: photosynthesis · Zea mays (maize)Results differ
4 papers in the same direction as this paper · 31 in the opposite direction
- positive
- negative
- negative
32 papers more in this group
See all 36 papers →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.