Abstract
We studied the temporal sequence of changes in the photosynthetic CO2/H2O gas exchange intensity, as well as leaf water status, contents of soluble carbohydrates, starch, proline, pigments, and MDA, in maize seedlings (Zea mays L., cv. Luchistaya) under adaptation to increasing water deficit. The duration of drought was 2, 3, 5, and 6 days. Withholding water from maize plants caused gradual increase in the intensity of water deficit: from mild (2 or 3 days) to moderate (5 days) and nearly severe (6 days) water stress. After 6 days, relative leaf water content decreased by 19.8% as compared to the control. On the second day after the onset of drought, slight reduction in the photosynthetic CO2/H2O gas exchange intensity of the treated plants was observed. After 6 days, photosynthesis and transpiration of leaves synchronously reduced almost threefold due to stomatal closure. The progressive soil drought had substantial impact on the carbohydrate metabolism. After 2 days of water deficit, the content of reducing sugars and sucrose increased slightly, whereas after 6 days, it increased ten and four times, respectively. After 2, 3, and 5 days of drought, the starch content declined slightly; however, under severe drought (6 days), it increased by 30% as compared to the control. Simultaneously with the increase in the content of soluble sugars, proline content increased significantly and it was the highest on the sixth day of drought. At all stages of water deficit, the proline content increased more significantly than the content of reducing carbohydrates and sucrose. Under increasing water deficit (5 and 6 days), the content of MDA was found to rise. At the initial drought stage (2 or 3 days) and under severe water deficit (6 days), no significant changes in the pigment content were observed. Thus, at the initial stages of progressive drought, in the leaves of this maize cultivar, a decline in photosynthetic activity proceeded simultaneously with accumulation of reducing sugars, sucrose, and proline. The results obtained showed that, at the first stages of adaptation of maize seedlings to drought, the changes in carbohydrate and proline metabolism have been observed, which have increased upon further plant dehydration.
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Claims 13
Claim · model-written summary
Relative leaf water content decreased by 19.8% after 6 days of withholding water compared with control
- Material
- cv. Luchistayae0
- Treatment
- Withholding watere2
- Outcome
- relative leaf water contente1
- Direction
- decreasede1
- Value
- 19.8%e1
- Qualifier
- After 6 dayse1
- Comparator
- controle1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e2“Withholding water from maize plants caused gradual increase in the intensity of water deficit”
e1“After 6 days, relative leaf water content decreased by 19.8% as compared to the control”
Claim · model-written summary
Photosynthetic CO2/H2O gas exchange showed slight reduction on the second day of drought
- Treatment
- Withholding watere2
- Outcome
- photosynthetic CO2/H2O gas exchange intensitye3
- Direction
- reductione3
- Value
- slighte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e2“Withholding water from maize plants caused gradual increase in the intensity of water deficit”
e3“On the second day after the onset of drought, slight reduction in the photosynthetic CO2/H2O gas exchange intensity of the treated plants was observed”
Claim · model-written summary
Photosynthesis and transpiration of leaves reduced almost threefold after 6 days due to stomatal closure
- Outcome
- photosynthesis and transpiration of leavese4
- Direction
- reducede4
- Value
- almost threefolde4
- Qualifier
- due to stomatal closuree4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e4“After 6 days, photosynthesis and transpiration of leaves synchronously reduced almost threefold due to stomatal closure”
Claim · model-written summary
Content of reducing sugars and sucrose increased slightly after 2 days of water deficit
- Outcome
- content of reducing sugars and sucrosee5
- Direction
- increasede5
- Value
- slightlye5
- Qualifier
- After 2 days of water deficite5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e5“After 2 days of water deficit, the content of reducing sugars and sucrose increased slightly”
Claim · model-written summary
Reducing sugars increased ten-fold after 6 days of drought
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e5“After 2 days of water deficit, the content of reducing sugars and sucrose increased slightly”
e6“whereas after 6 days, it increased ten and four times, respectively”
Claim · model-written summary
Sucrose increased four-fold after 6 days of drought
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e5“After 2 days of water deficit, the content of reducing sugars and sucrose increased slightly”
e6“whereas after 6 days, it increased ten and four times, respectively”
Claim · model-written summary
Starch content declined slightly after 2, 3 and 5 days of drought
- Outcome
- starch contente7
- Direction
- declinede7
- Value
- slightlye7
- Qualifier
- After 2, 3, and 5 days of droughte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e7“After 2, 3, and 5 days of drought, the starch content declined slightly”
Claim · model-written summary
Starch content increased 30% under severe drought (6 days) compared with control
- Treatment
- severe drought (6 days)e1
- Outcome
- starch contente7
- Direction
- increasede1
- Value
- 30%e1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e7“After 2, 3, and 5 days of drought, the starch content declined slightly”
e1“however, under severe drought (6 days), it increased by 30% as compared to the control”
Claim · model-written summary
Proline content increased significantly and was highest on the sixth day of drought
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e1“Simultaneously with the increase in the content of soluble sugars, proline content increased significantly and it was the highest on the sixth day of drought”
Claim · model-written summary
Proline content increased more significantly than reducing carbohydrates and sucrose at all stages of water deficit
- Treatment
- At all stages of water deficite1
- Outcome
- proline contente1
- Direction
- increased more significantlye1
- Comparator
- content of reducing carbohydrates and sucrosee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e1“At all stages of water deficit, the proline content increased more significantly than the content of reducing carbohydrates and sucrose”
Claim · model-written summary
MDA content rose under increasing water deficit (5 and 6 days)
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e1“Under increasing water deficit (5 and 6 days), the content of MDA was found to rise”
Claim · model-written summary
Pigment content showed no significant change at the initial drought stage or under severe water deficit
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e1“At the initial drought stage (2 or 3 days) and under severe water deficit (6 days), no significant changes in the pigment content were observed”
Claim · model-written summary
Decline in photosynthetic activity proceeded simultaneously with accumulation of reducing sugars, sucrose and proline
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in maize seedlings (Zea mays L., cv. Luchistaya)”
e1“in the leaves of this maize cultivar, a decline in photosynthetic activity proceeded simultaneously with accumulation of reducing sugars, sucrose, and proline”
The same questions in other papers
drought · physiology: water · Zea mays (maize)Positive and negative results
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