Abstract
Abstract Myo ‐inositol and its metabolic derivatives such as pinitol, galactinol, and raffinose affect growth and development and are also involved in stress adaptation. Previous studies have identified myo ‐inositol transporters (INTs) as transporters of Na + from root to shoot in the halophyte ice plant ( Mesembryanthemum crystallinum ). We found that the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings by decreasing the Na/K ratio in roots and increasing the Na/K ratio in shoots. Analyses of the uptake of exogenous myo ‐inositol revealed that ice plant seedlings contained intrinsic high‐affinity transporters and inducible low‐affinity uptake systems. The presence of Na + facilitated both high‐ and low‐affinity myo ‐inositol uptake. Six INT genes were identified from the ice plant transcriptome and named McINT1a , 1b , 2 , 4a , 4b , and 4c , according to the classification of the Arabidopsis INT family. In seedlings treated with myo ‐inositol, salt, or myo ‐inositol plus salt, the expression patterns of all McINT members differed in shoot and root, which indicates organ‐specific regulation of McINTs by salt and myo ‐inositol. The expression of McINT2 , 4a , 4b , and 4c was induced by salt stress in shoot and root, but that of McINT1a and 1b was salt‐induced only in shoot. The expression of pinitol biosynthesis gene IMT1 was induced by salt and myo ‐inositol, and their combination had a synergistic effect on the accumulation of pinitol. Supply of myo ‐inositol to salt‐treated seedlings alleviated the detrimental effects by maintaining a low root Na/K ratio and providing precursors for the synthesis of compatible solute to maintain the osmotic balance.
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Claims 11
Claim · model-written summary
Supplying myo-inositol alleviated the dehydration effects of salt stress in ice plant seedlings.
Not reportedComparator
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
Claim · model-written summary
Supplying myo-inositol decreased the Na/K ratio in ice plant roots under salt stress.
- Taxon
- ice plante0
- Organ / stage
- rootse1
- Treatment
- supply of myo ‐inositole0
- Outcome
- Na/K ratio in rootse1
- Direction
- decreasinge1
Not reportedComparator
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e1“by decreasing the Na/K ratio in roots and increasing the Na/K ratio in shoots”
Claim · model-written summary
Supplying myo-inositol increased the Na/K ratio in ice plant shoots under salt stress.
- Taxon
- ice plante0
- Organ / stage
- shootse1
- Treatment
- supply of myo ‐inositole0
- Outcome
- Na/K ratio in shootse1
- Direction
- increasinge1
Not reportedComparator
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e1“by decreasing the Na/K ratio in roots and increasing the Na/K ratio in shoots”
Claim · model-written summary
Ice plant seedlings contained intrinsic high-affinity and inducible low-affinity myo-inositol uptake systems.
Verbatim
e2“ice plant seedlings contained intrinsic high‐affinity transporters and inducible low‐affinity uptake systems”
Claim · model-written summary
The presence of Na+ facilitated both high- and low-affinity myo-inositol uptake.
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e3“The presence of Na + facilitated both high‐ and low‐affinity myo ‐inositol uptake”
Claim · model-written summary
Six INT genes were identified from the ice plant transcriptome, including McINT1a.
Verbatim
e4“Six INT genes were identified from the ice plant transcriptome and named McINT1a , 1b , 2 , 4a , 4b , and 4c”
Claim · model-written summary
Expression patterns of McINT genes differed between shoot and root under salt and myo-inositol, indicating organ-specific regulation.
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e5“the expression patterns of all McINT members differed in shoot and root, which indicates organ‐specific regulation of McINTs by salt and myo ‐inositol”
Claim · model-written summary
Salt stress induced McINT2, 4a, 4b and 4c expression in shoot and root.
- Taxon
- ice plante0
- Organ / stage
- shoot and roote6
- Treatment
- salt stresse6
- Gene
- McINT2e6
- Outcome
- expressione6
- Direction
- inducede6
Not reportedComparator
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e6“The expression of McINT2 , 4a , 4b , and 4c was induced by salt stress in shoot and root, but that of McINT1a and 1b was salt‐induced only in shoot”
Claim · model-written summary
Salt induced McINT1a and 1b expression only in shoot.
- Taxon
- ice plante0
- Organ / stage
- shoote6
- Treatment
- salte6
- Gene
- McINT1ae6
- Outcome
- expressione6
- Direction
- inducede6
Not reportedComparator
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e6“The expression of McINT2 , 4a , 4b , and 4c was induced by salt stress in shoot and root, but that of McINT1a and 1b was salt‐induced only in shoot”
Claim · model-written summary
Salt and myo-inositol induced IMT1 expression, the pinitol biosynthesis gene.
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e7“The expression of pinitol biosynthesis gene IMT1 was induced by salt and myo ‐inositol, and their combination had a synergistic effect on the accumulation of pinitol”
Claim · model-written summary
Combined salt and myo-inositol had a synergistic effect on pinitol accumulation.
Verbatim
e0“the supply of myo ‐inositol could alleviate the dehydration effects of salt‐stressed ice plant seedlings”
e7“The expression of pinitol biosynthesis gene IMT1 was induced by salt and myo ‐inositol, and their combination had a synergistic effect on the accumulation of pinitol”