Abstract
Ricinus communis is an important energy crop and also considered as one of the most potential plants for salt-alkali soil improvement in Northeast of China. Early seedling stage (such as the cotyledon expansion stage) is always vulnerable but plays a vital role in plant establishment, especially under stress condition. However, little information exists concerning the function of cotyledon and the relationship between cotyledon and true leaf in the adaptation to salt stress and alkali stress of this species. Here, Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3), growth, photosynthesis and chlorophyll fluorescence of cotyledons and true leaves were measured. The results showed that the biomass, photosynthetic parameters and qp value of both cotyledons and true leaves decreased with increasing salt-alkali stress, and the decrease in biomass, gs and Tr of true leaves were much greater than that of cotyledons. Salt-alkali stress only reduced photosynthetic pigments and ΦPSⅡ in cotyledons, but did not affect those in true leaves. Additionally, the Fv/Fm and NPQ between cotyledons and true leaves showed different trends in salinity and alkalinity. The results suggested that alkali stress could cause much more damage to the castor bean seedlings, and different physiological responses and adaptive strategies are found in cotyledons and true leaves under salt-alkali stress. This study will help us develop a better understanding of the adaptation mechanisms of cotyledon and true leaf during early seedling stage of castor bean plant, and also provide new insights into the function of cotyledon in Ricinus communis under salt-alkali stress condition.
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Claims 7
Claim · model-written summary
Biomass, photosynthetic parameters and qp value of both cotyledons and true leaves of Ricinus communis seedlings decreased with increasing salt-alkali stress.
- Taxon
- Ricinus communis
Ricinus communise0 - Organ / stage
- cotyledons and true leavese1
- Treatment
- increasing salt-alkali stresse1
- Outcome
- biomass, photosynthetic parameters and qp valuee1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“the biomass, photosynthetic parameters and qp value of both cotyledons and true leaves decreased with increasing salt-alkali stress”
Claim · model-written summary
The decrease in biomass, gs and Tr under salt-alkali stress was much greater in true leaves than in cotyledons.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- true leavese1
- Outcome
- decrease in biomass, gs and Tre1
- Direction
- greatere1
- Comparator
- cotyledonse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“the decrease in biomass, gs and Tr of true leaves were much greater than that of cotyledons”
Claim · model-written summary
Salt-alkali stress reduced photosynthetic pigments and ΦPSⅡ in cotyledons.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- cotyledonse1
- Treatment
- Salt-alkali stresse1
- Outcome
- photosynthetic pigments and ΦPSⅡe1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“Salt-alkali stress only reduced photosynthetic pigments and ΦPSⅡ in cotyledons”
Claim · model-written summary
Salt-alkali stress did not affect photosynthetic pigments and ΦPSⅡ in true leaves.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- true leavese1
- Treatment
- Salt-alkali stresse1
- Outcome
- photosynthetic pigments and ΦPSⅡe1
- Direction
- did not affecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“Salt-alkali stress only reduced photosynthetic pigments and ΦPSⅡ in cotyledons, but did not affect those in true leaves”
Claim · model-written summary
Fv/Fm and NPQ differed in trend between cotyledons and true leaves under salinity and alkalinity.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- cotyledons and true leavese1
- Outcome
- Fv/Fm and NPQe1
- Qualifier
- different trends in salinity and alkalinitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“the Fv/Fm and NPQ between cotyledons and true leaves showed different trends in salinity and alkalinity”
Claim · model-written summary
The authors conclude that alkali stress could cause much more damage to castor bean seedlings.
- Taxon
- castor beanRicinus communise0
- Treatment
- alkali stresse0
- Outcome
- damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alkali stress could cause much more damage to the castor bean seedlings”
Claim · model-written summary
The authors conclude that cotyledons and true leaves show different physiological responses and adaptive strategies under salt-alkali stress.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- cotyledons and true leavese1
- Treatment
- salt-alkali stresse1
- Outcome
- different physiological responses and adaptive strategiese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ricinus communis seedlings were treated with varying (40, 80 and 120 mM) salinity (NaCl) and alkalinity (NaHCO3)”
e1“different physiological responses and adaptive strategies are found in cotyledons and true leaves under salt-alkali stress”
The same questions in other papers
salinity · physiology: photosynthesis · Ricinus communis (castor bean)Results agree
6 papers in the same direction as this paper
- no effect
- negative
- negative
3 papers more in this group
See all 7 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.