Abstract
In the present study, we examined the potential role of paclobutrazol in delaying leaf senescence, in causing changes in the activities of antioxidants, and in the maintenance of photosynthetic activity during the senescence process, and, therefore, on the grain yield of maize under semiarid field conditions. Maize seeds were pretreated with 0 (CK), 200 (PS1), 300 (PS2), and 400 (PS3) mg paclobutrazol L−1. Our results indicated that elevated levels of reactive oxygen species (ROS) and higher accumulation of malondialdehyde (MDA) contents were positively associated with accelerated leaf senescence during the grain-filling periods. The leaf senescence resulted in the disintegration of the photosynthetic pigments and reduced the net photosynthetic rate after silking. However, the resultant ROS burst (O2− and H2O2) was lessened and the leaf senescence and chlorophyll degradation were evidently inhibited in leaves of paclobutrazol-treated maize plants, which was strongly linked with upregulated activities of antioxidant enzymes in treated plants. The enhanced chlorophyll contents and availability of a greater photosynthetic active green leaf area during the grain filling period facilitated the maintenance of higher photosynthetic rate, and light-harvesting efficiency of photosynthesis associated with photosystem II (PSII) resulted in higher kernel number ear−1 and thousand kernel weights, and thus increased the final grain yield. The average maize grain yield was increased by 18.8% to 55.6% in paclobutrazol treatments, compared to untreated control. Among the various paclobutrazol treatments, PS2 (300 mg L−1) treatment showed the most promising effects on enhancing the activities of antioxidative enzymes, delaying leaf senescence and improving the yield of maize. Thus, understanding this effect of paclobutrazol on delaying leaf senescence introduces new possibilities for facilitating yield improvement of maize under semiarid conditions.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Higher ROS and MDA accumulation were associated with accelerated maize leaf senescence during grain filling.
- Organ / stage
- leafe0
- Compound
- reactive oxygen species (ROS)e0
- Outcome
- leaf senescencee0
- Direction
- positively associatede0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated levels of reactive oxygen species (ROS) and higher accumulation of malondialdehyde (MDA) contents were positively associated with accelerated leaf senescence during the grain-filling periods”
t0“Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage”
Claim · model-written summary
Maize leaf senescence disintegrated photosynthetic pigments and reduced net photosynthetic rate after silking.
- Organ / stage
- leafe0
- Outcome
- photosynthetic pigments and reduced the net photosynthetic ratee0
- Qualifier
- leaf senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf senescence resulted in the disintegration of the photosynthetic pigments and reduced the net photosynthetic rate after silking.”
t0“Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage”
Claim · model-written summary
Paclobutrazol treatment lessened ROS burst in maize leaves.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the resultant ROS burst (O2− and H2O2) was lessened and the leaf senescence and chlorophyll degradation were evidently inhibited in leaves of paclobutrazol-treated maize plants”
Claim · model-written summary
Paclobutrazol treatment inhibited maize leaf senescence and chlorophyll degradation.
- Organ / stage
- leavese0
- Treatment
- paclobutrazol-treatede0
- Outcome
- leaf senescence and chlorophyll degradatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the resultant ROS burst (O2− and H2O2) was lessened and the leaf senescence and chlorophyll degradation were evidently inhibited in leaves of paclobutrazol-treated maize plants”
Claim · model-written summary
Antioxidant enzyme activity was upregulated in paclobutrazol-treated maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“upregulated activities of antioxidant enzymes in treated plants”
t0“Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage”
Claim · model-written summary
Enhanced chlorophyll and green leaf area maintained higher photosynthetic rate during grain filling.
- Outcome
- photosynthetic ratee0
- Direction
- highere0
- Qualifier
- enhanced chlorophyll contents and availability of a greater photosynthetic active green leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced chlorophyll contents and availability of a greater photosynthetic active green leaf area during the grain filling period facilitated the maintenance of higher photosynthetic rate”
t0“Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage”
Claim · model-written summary
Photosynthetic light harvesting efficiency was associated with higher kernel number and thousand kernel weight.
- Organ / stage
- kernele0
- Outcome
- kernel number ear−1 and thousand kernel weightse0
- Direction
- highere0
- Qualifier
- light-harvesting efficiency of photosynthesis associated with photosystem II (PSII)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-harvesting efficiency of photosynthesis associated with photosystem II (PSII) resulted in higher kernel number ear−1 and thousand kernel weights”
t0“Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage”
Claim · model-written summary
Paclobutrazol increased average maize grain yield by 18.8% to 55.6% against untreated control.
- Treatment
- paclobutrazol treatmentse0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 18.8% to 55.6%e0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average maize grain yield was increased by 18.8% to 55.6% in paclobutrazol treatments, compared to untreated control.”
Claim · model-written summary
The 300 mg L−1 paclobutrazol treatment was most promising for antioxidant activity, delayed senescence and yield.
- Treatment
- PS2 (300 mg L−1) treatmente0
- Outcome
- activities of antioxidative enzymes, delaying leaf senescence and improving the yielde0
- Direction
- most promisinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PS2 (300 mg L−1) treatment showed the most promising effects on enhancing the activities of antioxidative enzymes, delaying leaf senescence and improving the yield of maize.”
The same questions in other papers
paclobutrazol · yield · Zea mays (maize)Results differ
10 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.