Abstract
A field experiment was performed to investigate the physiological mechanism of the simultaneous stresses of waterlogging and shading on leaf photosynthetic and senescence during three growth stages of summer maize. The responses of leaf gas exchange parameters and antioxidant enzyme activities of the summer maize hybrids Denghai 605 (DH605) to waterlogging (W), shading (S), and their combination (W + S) for 6 days at the third leaf stage (V3), the sixth leaf stage (V6), and the tasseling stage (VT) were recorded. Shading, waterlogging, and their combination disturbed the activities of protective enzymes and increased the contents of H2O2 and O2−, accelerating leaf senescence and disordering photosynthetic characteristics. Under waterlogging, shading and their combination, leaf Pn, the photo-assimilates and grain yield was decreased. The greatest reduction for waterlogging and the combined stresses occurred at V3 and that for shading stress occurred at VT. The individual and combined stresses reduced the activities of protective enzymes and inhibited photosynthesis, reducing the accumulation of photosynthetic compounds and thereby yield. Waterlogging and the combined stresses at the V3 stage showed the greatest effect on leaf photosynthetic and senescence, followed by the V6 and VT stages. The greatest effect for shading stress occurred at VT, followed by the V6 and V3 stages, and the combined influence of shading and waterlogging was greater than that of either single stress.
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Claims 11
Claim · model-written summary
Shading disturbed protective enzymes and increased reactive oxygen contents.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading, waterlogging, and their combination disturbed the activities of protective enzymes and increased the contents of H2O2 and O2−”
t0“summer maize”
Claim · model-written summary
Waterlogging disturbed protective enzyme activities.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading, waterlogging, and their combination disturbed the activities of protective enzymes”
t0“summer maize”
Claim · model-written summary
Combined stresses disturbed protective enzyme activities.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading, waterlogging, and their combination disturbed the activities of protective enzymes”
t0“summer maize”
Claim · model-written summary
The stresses increased H2O2 and O2− contents.
- Treatment
- Shading, waterlogging, and their combinatione0
- Outcome
- contents of H2O2 and O2−e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading, waterlogging, and their combination disturbed the activities of protective enzymes and increased the contents of H2O2 and O2−”
t0“summer maize”
Claim · model-written summary
The stresses accelerated leaf senescence.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accelerating leaf senescence and disordering photosynthetic characteristics”
t0“summer maize”
Claim · model-written summary
Waterlogging reduced leaf Pn, photoassimilates and grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under waterlogging, shading and their combination, leaf Pn, the photo-assimilates and grain yield was decreased.”
t0“summer maize”
Claim · model-written summary
Shading reduced leaf Pn, photoassimilates and grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under waterlogging, shading and their combination, leaf Pn, the photo-assimilates and grain yield was decreased.”
t0“summer maize”
Claim · model-written summary
Combined stress reduced leaf Pn, photoassimilates and grain yield.
- Treatment
- their combinatione0
- Outcome
- leaf Pn, the photo-assimilates and grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under waterlogging, shading and their combination, leaf Pn, the photo-assimilates and grain yield was decreased.”
t0“summer maize”
Claim · model-written summary
Waterlogging and combined stress effects were greatest at V3.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest reduction for waterlogging and the combined stresses occurred at V3”
t0“summer maize”
Claim · model-written summary
Shading effects were greatest at VT.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that for shading stress occurred at VT”
t0“summer maize”
Claim · model-written summary
Combined shading and waterlogging had greater influence than either alone.
- Treatment
- shading and waterlogginge0
- Outcome
- influencee0
- Direction
- greatere0
- Comparator
- either single stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combined influence of shading and waterlogging was greater than that of either single stress.”
t0“summer maize”
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