Abstract
The low seed vigor and poor field emergence are main factors that restricting the extension of sweet corn in China. Spermidine (Spd) plays an important role in plant growth and development, but little is known about the effect of Spd on sweet corn seed germination. Therefore the effect of exogenous Spd on seed germination and physiological and biochemical changes during seed imbibition of Xiantian No.5 were investigated in this study. Spd soaking treatment not only improved seed germination percentage but also significantly enhanced seed vigor which was indicated by higher germination index, vigor index, shoot heights and dry weights of shoot and root compared with the control; while exogenous CHA, the biosynthesis inhibitor of Spd, significantly inhibited seed germination and declined seed vigor. Spd application significantly increased endogenous Spd, gibberellins and ethylene contents and simultaneously reduced ABA concentration in embryos during seed imbibition. In addition, the effects of exogenous Spd on H 2 O 2 and MDA productions were also analyzed. Enhanced H 2 O 2 concentration was observed in Spd-treated seed embryo, while no significant difference of MDA level in seed embryo was observed between Spd treatment and control. However, the lower H 2 O 2 and significantly higher MDA contents than control were detected in CHA-treated seed embryos. The results suggested that Spd contributing to fast seed germination and high seed vigor of sweet corn might be closely related with the metabolism of hormones including gibberellins, ABA and ethylene, and with the increase of H 2 O 2 in the radical produced partly from Spd oxidation. In addition, Spd might play an important role in cell membrane integrity maintaining.
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Claims 12
Claim · model-written summary
Spd soaking improved sweet corn seed germination percentage compared with the control.
Verbatim
t0“sweet corn”
e0“Spd soaking treatment not only improved seed germination percentage but also significantly enhanced seed vigor which was indicated by higher germination index, vigor index, shoot heights and dry weights of shoot and root compared with the control”
Claim · model-written summary
Spd soaking significantly enhanced seed vigor, shown by higher germination index and vigor index than the control.
Verbatim
t0“sweet corn”
e0“Spd soaking treatment not only improved seed germination percentage but also significantly enhanced seed vigor which was indicated by higher germination index, vigor index, shoot heights and dry weights of shoot and root compared with the control”
Claim · model-written summary
Spd soaking gave higher shoot heights and dry weights of shoot and root than the control.
Verbatim
t0“sweet corn”
e0“Spd soaking treatment not only improved seed germination percentage but also significantly enhanced seed vigor which was indicated by higher germination index, vigor index, shoot heights and dry weights of shoot and root compared with the control”
Claim · model-written summary
Exogenous CHA, the biosynthesis inhibitor of Spd, significantly inhibited seed germination and declined seed vigor.
- Taxon
- sweet cornt0
- Treatment
- exogenous CHAe0
- Outcome
- seed germination and declined seed vigore0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
t0“sweet corn”
e0“exogenous CHA, the biosynthesis inhibitor of Spd, significantly inhibited seed germination and declined seed vigor”
Claim · model-written summary
Spd application significantly increased endogenous Spd, gibberellins and ethylene contents in embryos during seed imbibition.
- Taxon
- sweet cornt0
- Organ / stage
- embryose0
- Treatment
- Spd applicatione0
- Outcome
- endogenous Spd, gibberellins and ethylene contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“sweet corn”
e0“Spd application significantly increased endogenous Spd, gibberellins and ethylene contents and simultaneously reduced ABA concentration in embryos during seed imbibition”
Claim · model-written summary
Spd application significantly reduced ABA concentration in embryos during seed imbibition.
- Taxon
- sweet cornt0
- Organ / stage
- embryose0
- Treatment
- Spd applicatione0
- Outcome
- ABA concentratione0
- Direction
- reducede0
Not reportedComparator
Verbatim
t0“sweet corn”
e0“Spd application significantly increased endogenous Spd, gibberellins and ethylene contents and simultaneously reduced ABA concentration in embryos during seed imbibition”
Claim · model-written summary
Enhanced H2O2 concentration was observed in Spd-treated seed embryos.
- Taxon
- sweet cornt0
- Organ / stage
- seed embryoe0
- Treatment
- Spd-treatede0
- Outcome
- H 2 O 2 concentratione0
- Direction
- Enhancede0
Not reportedComparator
Verbatim
t0“sweet corn”
e0“Enhanced H 2 O 2 concentration was observed in Spd-treated seed embryo”
Claim · model-written summary
No significant difference in MDA level in seed embryos was observed between Spd treatment and control.
Verbatim
t0“sweet corn”
e0“no significant difference of MDA level in seed embryo was observed between Spd treatment and control”
Claim · model-written summary
CHA-treated seed embryos had lower H2O2 than control.
Verbatim
t0“sweet corn”
e0“the lower H 2 O 2 and significantly higher MDA contents than control were detected in CHA-treated seed embryos”
Claim · model-written summary
CHA-treated seed embryos had significantly higher MDA content than control.
Verbatim
t0“sweet corn”
e0“the lower H 2 O 2 and significantly higher MDA contents than control were detected in CHA-treated seed embryos”
Claim · model-written summary
The authors suggest Spd contributes to fast germination and high vigor of sweet corn seeds through hormone metabolism (gibberellins, ABA, ethylene) and increased H2O2 partly from Spd oxidation.
Verbatim
e0“Spd contributing to fast seed germination and high seed vigor of sweet corn might be closely related with the metabolism of hormones including gibberellins, ABA and ethylene, and with the increase of H 2 O 2 in the radical produced partly from Spd oxidation”
Claim · model-written summary
The authors suggest Spd might play an important role in maintaining cell membrane integrity.
Verbatim
t0“sweet corn”
e0“Spd might play an important role in cell membrane integrity maintaining”
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