Abstract
Abstract: The seed germination and seedling growth of pakchoi (Brassica campestris ssp. chinensis var. communis Tsen et Lee cv. Hanxiao) were not significantly inhibited until the concentration of NaCl was increased to150 mmol/L. Treatment of pakchoi seeds with exogenous 5-aminolevulinic acid (ALA), at concentrations ranging from 0.01 to 10.00 mg/L, promoted seed germination when seeds were stressed by salinity, whereas levulinic acid (LA), an inhibitor of ALA dehydrase, significantly inhibited seed germination and seedling growth, suggesting that metabolism of ALA into porphyrin compounds was necessary for seed germination and seedling growth. Determination of respiratory rate during seed germination showed that ALA increased seed respiration under both normal conditions and salt stress. Furthermore, salt stress decreased levels of endogenous ALA, as well as heme, in etiolated seedlings. More salt-tolerant cultivars of pakchoi contained higher relative levels of endogenous ALA and heme under conditions of salt stress. These results indicate that salt stress may inhibit the biosynthesis of endogenous ALA and then heme, which is necessary for seed germination, and treatment of seeds with exogenous ALA prior to germination may be associated with the biosynthesis of heme. (Managing editor: Ping HE)
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Claims 6
Claim · model-written summary
Pakchoi seed germination and seedling growth were not significantly inhibited below 150 mmol/L NaCl.
- Taxon
- pakchoie0
- Material
- Hanxiaoe0
- Treatment
- NaCle0
- Outcome
- seed germination and seedling growthe0
- Direction
- not significantly inhibitede0
- Value
- 150 mmol/Le0
Not reportedComparator
Verbatim
e0“The seed germination and seedling growth of pakchoi (Brassica campestris ssp. chinensis var. communis Tsen et Lee cv. Hanxiao) were not significantly inhibited until the concentration of NaCl was increased to150 mmol/L”
Claim · model-written summary
Exogenous ALA promoted germination of pakchoi seeds under salinity stress.
- Taxon
- pakchoie0
- Treatment
- exogenous 5-aminolevulinic acid (ALA), at concentrations ranging from 0.01 to 10.00 mg/Le0
- Outcome
- seed germinatione0
- Direction
- promotede0
- Qualifier
- stressed by salinitye0
Not reportedComparator
Verbatim
e0“Treatment of pakchoi seeds with exogenous 5-aminolevulinic acid (ALA), at concentrations ranging from 0.01 to 10.00 mg/L, promoted seed germination when seeds were stressed by salinity”
Claim · model-written summary
Levulinic acid significantly inhibited pakchoi seed germination and seedling growth.
- Taxon
- pakchoit0
- Treatment
- levulinic acid (LA)e0
- Outcome
- seed germination and seedling growthe0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“levulinic acid (LA), an inhibitor of ALA dehydrase, significantly inhibited seed germination and seedling growth”
t0“Pakchoi”
Claim · model-written summary
ALA increased seed respiration under normal and salt-stress conditions.
- Taxon
- Pakchoit0
- Treatment
- ALAe0
- Outcome
- seed respiratione0
- Direction
- increasede0
- Qualifier
- both normal conditions and salt stresse0
Not reportedComparator
Verbatim
e0“ALA increased seed respiration under both normal conditions and salt stress”
t0“Pakchoi”
Claim · model-written summary
Salt stress decreased endogenous ALA and heme levels in etiolated pakchoi seedlings.
- Taxon
- Pakchoit0
- Organ / stage
- etiolated seedlingse0
- Treatment
- salt stresse0
- Outcome
- levels of endogenous ALA, as well as hemee0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“salt stress decreased levels of endogenous ALA, as well as heme, in etiolated seedlings”
t0“Pakchoi”
Claim · model-written summary
More salt-tolerant pakchoi cultivars had higher endogenous ALA and heme under salt stress.
Verbatim
e0“More salt-tolerant cultivars of pakchoi contained higher relative levels of endogenous ALA and heme under conditions of salt stress”
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