Salinity tolerance

2 Project sum-up3 Undertaking inside informations3.1.1 Introduction

Among abiotic emphasiss, salt is a major 1 that causes harm of the productive land. On Earth more than 6 % of lands are affected by salt ( Munns 2005 ) .

More than 5 % of the entire 1.5 billion hectares of cultivated universe country is touched by salt ( Tester and Davenport 2003 ) .In Australia, saline dirts are estimated to be a doomed of harvests production in norm of $ 130 1000000s each twelvemonth. Furthermore, the salt affected Australian country is expected to increase in the following 40 old ages from 5.7M to 17M hour angle ( NLWRA, National Land and Water Resources Audit 2001 ) .Around the universe, there are different types of salts like Mg chloride, sulphate chloride, Ca chloride and the most common and soluble in dirts: Na chloride ( NaCl ) . A land is considered to be saline when the Electrical conduction of the satured paste infusion ( ECe ) is 4dS/m or more, which correspond to a concentration of 40mM of NaCl ( Munns and Tester 2008 ) .

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The chief intent of the works root system is to pull out H2O from the dirt. Water and foods are so transported through the leaf country via the vascular system. Plants are non nomadic and will turn where they germinated even in an unfavorable environment. As a consequence, workss have developed different mechanisms to last or digest the utmost conditions ( drouth, high salt etc… ) .

Harmonizing to Munns and Tester 2008, 3 brinies salinity tolerance mechanisms have been identified in the blossoming workss:Osmotic tolerance, tissue tolerance and Na exclusion.The osmotic emphasis is non specific to salt but it consequences in a decrease in growing of the immature foliages and stomatous closing. The complexes mechanisms commanding the osmotic tolerance are still unknown but their purpose is to seek to cut down the entry of salt in the cells ( Munns 2005 ) .The two others mechanisms follow the same rule: to maintain Na out of the cytol because high concentration is toxic.

The Na+ and Cl- ions can interfere with enzymes activities and lead to the decease of the cell.The 2nd mechanism, the tissue tolerance, chiefly corresponds to the segregation of the Na+ and Cl- ions into a compartment like the vacuole. The 3rd mechanism is the sodium exclusion. Plants have developed frogmans transporters systems to minimise the burden of the Na into the xylem. Some transporters household named HKT ( high affinity K+ transporter ) have been identified in different species ( Platten et al. 2006 ) .

One members of the household ; HKT1 ; 5 have been good characterised. Its map is to recover Na from the xylem sap and by effect bound the accretion of ions in the leaf country. ( Ren et al. 2005 )The blossoming workss are divided in 2 major groups: the magnoliopsids and liliopsids. The seedlings of the magnoliopsids have 2 seed leafs ( seed-leaves ) in contrast with the liliopsids which merely have one.

A theoretical account works for each group has been chosen by the scientific works biological science community: Arabidopsis thaliana for the magnoliopsids and the rice for the liliopsids.The 120Mb genome of Arabidopsis thaliana was sequenced in 2000 by the SSP ( Salk, Stanford, PGEC ) pool. The works belongs to the mustard household but do non hold an agronomic involvement. However, its small life rhythm and many smasher mutations every bit good as the easy everyday transmutation via Agrobacterium tumefaciens have made this theoretical account a really utile tool in familial and works molecular biological science.As a theoretical account works for the liliopsids, the rice japonica cultivar ( Nipponbare ) has been sequenced in 2005 by the international attempt ( IRGSP ) . The rice is one of the 3 chief cereals cultivated around the universe and besides a beginning of nutrient for universe ‘s population.

It is chiefly cultivated and consumed in Asia. Unfortunately, the rice works is besides the cereal the most sensitive to salt. ( Munns and Tester 2008 )Numerous rice databases have emerged and on-line tools are available to clarify the map of the cistrons.Previous work have focused whole variety meats of workss. need to understand how multicellular being header with environmental alterations at the cell degree.

In order to better understand the familial mechanisms of the salt tolerance at the cell type specific degree, this research will concentrate on the comparing of the transcriptional profile under salt and control conditions in 2 cell types of the root: cerebral mantle and stele. This research will besides uncover new campaigners cistrons cell type particular implicated in salt tolerance. Furthermore, the survey will utilize the 2 genomes sequenced theoretical accounts workss Arabidopsis thaliana and the rice to able a comparing between the 2 blossoming groups. This research will give a good overview of the cistron look and the ordinance of the mechanisms to salt in both theoretical accounts workss at the cell type specific degree.

3.1.2 Literature reappraisal3.

1.2.1 Global written text profile analysis

Def: looking at look of all know cistrons at a precise clip of development and in 1 tissue/organ. Try to understand via cistron look what is the destiny of a type of cell. Idea is to happen how cells from an organ can pass on together, coordinationVisualize the look degrees of the cistrons: northern smudge, RT pcr et now french friess for that usage of tools microarrays engineering


1.1 Use of microarrays.

Microarrays groups a batch of deoxyribonucleic acid seq on the same support ; high through put analysisExist 2 types of microarrays: the one where you can publish some deoxyribonucleic acid seq ( amplified via PCR before )The other synthetise in situ like Affymetrix: 11 investigations stand foring one cistron or expressed seq.

( Galbraith and Birnbaum 2006 )Affymetrix rice ( depict it 510000 cistrons )A batch of informations available on web can be compared but bounds cause duplicability non good: alteration in experimentorStandardization and statistical trials to corroborate the changing in look degree is existent. Study of the planetary responses under salt emphasis ( utilizing microarrays )

Salt antiphonal cistron /Novel TF place via arrays ( Chao et al.

2005, Gao et Al. 2007, Wu et Al. 2006 ) Transcription profile surveies identification cistrons and TF under high salt ( Seki and Shinozaki 2009, Wang et Al.

2003 )Tf regulated inunders alt stress categorization ( Nakashima et al. 2009 ) Limits for harvest output3.1.2.

1.3.1 high salt emphasis

make it match to a physiologic emphasis? ( reexamine Munns and examiner )



2 characterise molecular maps of cistrons via mutations

overexpression OSABI5 cistrons in whole works high salt opposition ( Nakashima, Ito and Yamaguchi-Shinozaki 2009 )( diminish the output rice AP37 ) ( Kim and Kim 2009 )Profile look in whole root / tissue and now in cell type particular Cell specific written text profile

Def: analyze the look of one cell type in one environment.Try to detect cistrons that are merely expressed in one cell type.Example pollen between 650 to 850 cistrons expressed at the 4 phases of the pollen development monolithic difference in correlativity between those cistrons in early and late phase of development. ( Galbraith and Birnbaum 2006 )


15 localised look spheres ( LED ) or zones of the arabidpsis root mapped and correspond to.( Birnbaum et al.

2003 )To make that demand to insulate the cells: 2 methodsMeca: dissection of cells in root or one organ under microscope but may be hard for some cells like pollen, or cells emballed in a organ.2d methods utilizing optical maser: fluorescent activated sorting: usage of newsman cistron to choose the cells ( GFP ) . ( Johnson et al.

2005 )And phase of protoplasting, extinguish the wall Organization of roots in liliopsids and magnoliopsids

What is the advantage? Discover cistrons cell type particular, use of 1 cistron in 1 cell type ( non GMOs any longer )Disadvantage Arabidopsis thaliana root look profile ( Birnbaum, Shasha, Wang, Jung, Lambert, Galbraith and Benfey 2003 ) good base for comparative survey


2.2 Designation of boosters

( command spacial and developmental phase )rice system GAL4 foil trap ( Johnson, Hibberd, Gay, Essah, Haseloff, Tester and Guiderdoni 2005 ) and his dual advantage to command cistron of involvement expressed in cell type particular ( Mller et al. ) Expression of one cistron of involvement in 1 cell type

Designation of group cistrons specific to a cell type and comparative surveies ( Nawy et al.

2005 )Example of Inge HKT1.1 ( illustration for salt ) ( Mller et al. 2009 )“A transcriptome Atlass of rice cell types uncovers cellular, functional and developmental hierarchies” ( Jiao et al. 2009 ) Example Ca cell type particular in Arabidopsis thaliana roots endo and peri ( Kiegle et al. 2000 ) Compartimentation subdivision in roots ( Galbraith and Birnbaum 2006 ) ReviewProfile cistron look in rice shoot ( Zhou et al.

2007 )

3.2 Research inquiries

In order to place the campaigners cistrons specifically up regulated or down regulated expressed in the stele and cerebral mantle of the rice and Arabidopsis thaliana under mild salt emphasis ; this research has the undermentioned purposes.

3.3 Purposes of the undertaking

* The first measure of this survey will be to research the written text profile of cell type specific under mild salt emphasis in the rice.* The 2nd measure will be to place new cistrons implicated in salt responses in rice in cell type particular: stele and cerebral mantle.* In order to qualify the map of those campaigners ‘ cistrons, the seeds matching to the selected mutated cistrons will be order. The seeds will be growing to bring forth more posterities.

* The new coevals of rice workss will be tested in salt and control conditions to qualify the molecular maps of those cistrons and their deductions in salt tract opposition.* The complete written text profile analysis of Arabidopsis thaliana under mild salt emphasis will besides be performed.* The consequences will assist to place Arabidopsis thaliana‘s cistrons from cerebral mantle and stele specifically up or down regulated under salt emphasis.* Bioinformatics will be usage to categorise the major categories of cistrons implicated in mild salt tolerance in the 2 theoretical account species rice and Arabidopsis thaliana.3.4 Theoretical model and methods3.

4.1 Microarray experiments3.4.

1.1 Growth conditions and salt intervention3.4.1.2 Generating the energids3.4.

1.3 Screening the energids via FACS3.4.1.4 RNA extraction3.4.1.5 complementary DNA elaboration and shearing3.

4.1.6 Hybridization, rinsing and scanning3.4.

2 Bioinformatic analysis3.4.2.

1 Standardization3.4.2.2 Statistical trial3.5 Contribution to the subject

Question11: what specific cistrons are activated in response to salt intervention in the stele and cerebral mantle cells?

Hypothesis: A combination of transporters, osmotic regulators, enzymes. Discovery of new proteins implicated in salt tolerance?Experiments: affymetrix french friess from enriched stellar or cerebral mantle energids.

Question1: what specific written text factors activate HKT1.5 in response to salt intervention in the stele and cerebral mantle cells?

Hypothesis: A combination of TF should adhere different booster sites.

There will be a specific combination of TF under salt emphasis to over expressed HKT1.5. Expecting different TF in the 2 type ‘s cells?


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