Abstract
Photosynthesis is sensitive to water deficit (WD) stress. Maize (Zea mays L.) yield is vulnerable to water stress, especially if it occurs during the reproductive stage. In this study, the expression patterns of photosynthesis-related genes, together with photosynthetic gas-exchange and fluorescence parameters were investigated in a maize inbred line exposed to 50% of field water capacity (moderate WD) for 15 d after tassel emergence. The results demonstrated that WD down-regulated expression of psbA, psbB, psbC, psbP, psaA, psaB, and cab, especially at later periods of WD stress. Besides, with the increased WD stress, the steady decline in the value of photosynthesis performance index, maximum quantum yield of primary photochemistry, quantum yield for electron transport, quantum yield for the reduction of end acceptors of PSI per photon absorbed, and the efficiency of an electron beyond QA- that reduced PSI acceptors, and a clear increase in the J-step and I-step, K-band as well as L-band were observed. The results suggested that WD might restrict light-harvesting and electron transport. Interestingly, leaf transcript levels of rbcL and rbcS were up-regulated at the later stage of water stress in maize inbred line, which helped repair injury to PSII centers and maintain PSII activity (increased quantum yield of dissipation and effective antenna size of an active reaction center) under 15-d lasting WD.
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Claims 6
Claim · model-written summary
Water deficit down-regulated expression of seven photosynthesis-related genes, especially later in stress.
- Treatment
- WD stresse0
- Outcome
- expression of psbA, psbB, psbC, psbP, psaA, psaB, and cabe0
- Direction
- down-regulatede0
- Qualifier
- especially at later periods of WD stresse0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WD down-regulated expression of psbA, psbB, psbC, psbP, psaA, psaB, and cab, especially at later periods of WD stress”
t0“maize (Zea mays L.)”
Claim · model-written summary
Increasing water deficit steadily decreased five photosynthetic performance and yield measures.
- Treatment
- increased WD stresse0
- Outcome
- photosynthesis performance index, maximum quantum yield of primary photochemistry, quantum yield for electron transporte0
- Direction
- steady declinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the increased WD stress, the steady decline in the value of photosynthesis performance index, maximum quantum yield of primary photochemistry, quantum yield for electron transport, quantum yield for the reduction of end acceptors of PSI per photon absorbed, and the efficiency of an electron beyond QA- that reduced PSI acceptors”
t0“maize (Zea mays L.)”
Claim · model-written summary
J-step, I-step, K-band, and L-band increased with water deficit.
- Treatment
- increased WD stresse1
- Outcome
- J-step and I-step, K-band as well as L-bande0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a clear increase in the J-step and I-step, K-band as well as L-band were observed”
e1“with the increased WD stress”
t0“maize (Zea mays L.)”
Claim · model-written summary
Water deficit may restrict light harvesting and electron transport.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WD might restrict light-harvesting and electron transport”
t0“maize (Zea mays L.)”
Claim · model-written summary
Leaf rbcL and rbcS transcripts were up-regulated at the later water stress stage.
- Organ / stage
- leafe0
- Treatment
- water stresse0
- Outcome
- leaf transcript levels of rbcL and rbcSe0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf transcript levels of rbcL and rbcS were up-regulated at the later stage of water stress in maize inbred line”
Claim · model-written summary
Authors interpret rbcL and rbcS up-regulation as helping repair PSII injury and maintain PSII activity.
- Gene
- rbcL and rbcSe0
- Outcome
- repair injury to PSII centers and maintain PSII activitye0
- Qualifier
- under 15-d lasting WDe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf transcript levels of rbcL and rbcS were up-regulated at the later stage of water stress in maize inbred line, which helped repair injury to PSII centers and maintain PSII activity (increased quantum yield of dissipation and effective antenna size of an active reaction center) under 15-d lasting WD”
The same questions in other papers
drought · molecular: expression · Zea mays (maize)Positive and negative results
21 papers in the same direction as this paper · 43 in the opposite direction
- positive
- positive
- positive
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