Abstract
Heat stress during reproductive and grain filling phases adversely affects the growth of cereals through reduction in grain’s number and size. However, exogenous application of antioxidants, plant growth regulators and osmoprotectants may be helpful to minimize these heat induced yield losses in cereals. This two year study was conducted to evaluate the role of exogenous application of ascorbic acid (AsA), salicylic acid (SA) and hydrogen peroxide (H2O2) applied through seed priming or foliar spray on biochemical, physiological, morphological and yield related traits, grain yield and quality of late spring sown hybrid maize. The experiment was conducted in the spring season of 2007 and 2008. We observed that application of AsA, SA and H2O2 applied through seed priming or foliar spray improved the physiological, biochemical, morphological and yield related traits, grain yield and grain quality of late spring sown maize in both years. In both years, we observed higher superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activity in the plants where AsA, SA and H2O2were applied through seed priming or foliar spray than control. Membrane stability index (MSI), relative water contents (RWC), chlorophyll contents, grain yield and grain oil contents were also improved by exogenous application of AsA, SA and H2O2 in both years. Seed priming of AsA, SA and H2O2was equally effective as the foliar application. In conclusion, seed priming with AsA, SA and H2O2 may be opted to lessen the heat induced yield losses in late sown spring hybrid maize. Heat tolerance induced by ASA, SA and H2O2 may be attributed to increase in antioxidant activities and MSI which maintained RWC and chlorophyll contents in maize resulting in better grain yield in heat stress conditions.
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Claims 8
Claim · model-written summary
AsA applied by seed priming or foliar spray improved maize physiological, morphological, yield, and quality traits.
- Treatment
- AsAe0
- Outcome
- physiological, biochemical, morphological and yield related traits, grain yield and grain qualitye0
- Direction
- improvede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of AsA, SA and H2O2 applied through seed priming or foliar spray improved the physiological, biochemical, morphological and yield related traits, grain yield and grain quality”
t0“maize”
Claim · model-written summary
SA applied by seed priming or foliar spray improved maize physiological, morphological, yield, and quality traits.
- Treatment
- SAe0
- Outcome
- physiological, biochemical, morphological and yield related traits, grain yield and grain qualitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of AsA, SA and H2O2 applied through seed priming or foliar spray improved the physiological, biochemical, morphological and yield related traits, grain yield and grain quality”
t0“maize”
Claim · model-written summary
H2O2 applied by seed priming or foliar spray improved maize physiological, morphological, yield, and quality traits.
- Treatment
- H2O2e0
- Outcome
- physiological, biochemical, morphological and yield related traits, grain yield and grain qualitye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of AsA, SA and H2O2 applied through seed priming or foliar spray improved the physiological, biochemical, morphological and yield related traits, grain yield and grain quality”
t0“maize”
Claim · model-written summary
AsA, SA, and H2O2 applications raised SOD, CAT, and POD activity compared with controls.
- Treatment
- AsA, SA and H2O2e0
- Outcome
- superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activitye0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activity in the plants where AsA, SA and H2O2were applied through seed priming or foliar spray than control”
t0“maize”
Claim · model-written summary
Applications improved membrane stability, water content, and chlorophyll content.
- Treatment
- AsA, SA and H2O2e0
- Outcome
- Membrane stability index (MSI), relative water contents (RWC), chlorophyll contentse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Membrane stability index (MSI), relative water contents (RWC), chlorophyll contents, grain yield and grain oil contents were also improved by exogenous application of AsA, SA and H2O2”
t0“maize”
Claim · model-written summary
Applications improved grain yield and grain oil content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Membrane stability index (MSI), relative water contents (RWC), chlorophyll contents, grain yield and grain oil contents were also improved by exogenous application of AsA, SA and H2O2”
t0“maize”
Claim · model-written summary
Seed priming was as effective as foliar application.
- Treatment
- Seed priming of AsA, SA and H2O2e0
- Outcome
- equally effectivee0
- Direction
- equally effectivee0
- Comparator
- foliar applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed priming of AsA, SA and H2O2was equally effective as the foliar application”
t0“maize”
Claim · model-written summary
The authors recommend seed priming with AsA, SA, and H2O2 to reduce heat-induced yield losses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed priming with AsA, SA and H2O2 may be opted to lessen the heat induced yield losses in late sown spring hybrid maize”
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