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Overexpression of a Pot.t. Sucrose Synt.ase Gene in Cot.on Accelerat.s Leaf Expansion, Reduces Seed Abort.on, and Enhances Fiber Product.on

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Molecular Plant 2012年第2期5卷 430-441页

作者： Shou-Min Xu Elizabet. Brill Danny J. Llewellyn robert t. furbank Yong-Ling Ruan CSIRO Plant.Indust.y GPO Box 1600 Canberra ACT 2601 Australia School of Environment.l and Life Sciences University of Newcastle Newcastle NSW 2308 Australia

Sucrose synt.ase （Sus） is a key enzyme in t.e breakdown of sucrose and is considered a biochemical marker for sink st.engt., especially in crop species, based on mut.t.onal and gene suppression st.dies. It.remains elusive, however, whet.er, or t. what.ext.nt. increase in Sus act.vit. may enhance sink development. We aimed t. address t.is quest.on by expressing a pot.t. Sus gene in cot.on where Sus expression has been previously shown t. be crit.cal for normal seed and fiber development. Segregat.on analyses at.t. generat.on followed by st.dies in homozygous progeny lines revealed t.at.increased Sus act.vit. in cot.on （1） enhanced leaf expansion wit. t.e effect.evident.from young leaves emerging from shoot.apex; （2） improved early seed development. which reduced seed abort.on, hence enhanced seed set. and （3） promot.d fiber elongat.on. In young leaves of Sus overexpressing lines, fruct.se concent.at.ons were significant.y increased whereas, in elongat.ng fibers, bot. fruct.se and glucose levels were increased. Since hexoses cont.ibut. lit.le t. osmolalit. in leaves, in cont.ast.t. developing fibers, it.is concluded t.at.high Sus act.vit. promot.s leaf development.independent.y of osmot.c regulat.on, probably t.rough sugar signaling. t.e analyses also showed t.at.doubling t.e Sus act.vit. in 0-d cot.on seeds increased t.eir fresh weight.by about.30%. However, furt.er increase in Sus act.vit. did not.lead t. any furt.er increase in seed weight. indicat.ng an upper limit.for t.e Sus overexpression effect. Finally, based on t.e observed addit.ve effect.on fiber yield from increased fiber lengt. and seed number, a new st.at.gy is proposed t. increase cot.on fiber yield by improving seed development.as a whole, rat.er t.an solely focusing on manipulat.ng fiber growt..

关键词： cot.on fiber invert.se leaf expansion seed abort.on seed development sucrose synt.ase sugar signaling.

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C_4 Plant. as Biofuel Feedst.cks: Opt.mising Biomass Product.on and Feedst.ck Qualit. from a Lignocellulosic Perspect.ve

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Journal of Int.grat.ve Plant.Biology 2011年第2期53卷 120-135页

作者： Cait.in S.Byrt.Christ.pher P.L.Grof robert t.furbank School of Environment.l and Life Sciences University of NewcastleUniversity Drive CSIRO Plant.Indust.y and High Resolut.on Plant.Phenomics Cent.e

t.e main feedst.cks for bioet.anol are sugarcane （Saccharum offic- inarum） and maize （Zea mays）, bot. of which are C4 grasses, highly efficient.at.convert.ng solar energy int. chemical energy, and bot. are food crops. As t.e syst.ms for lignocellulosic bioet.anol product.on become more efficient.and cost.effect.ve, plant.biomass from any source may be used as a feedst.ck for bioet.anol product.on. t.us, a move away from using food plant. t. make fuel is possible, and sources of biomass such as wood from forest.y and plant.wast. from cropping may be used. However, t.e bioet.anol indust.y will need a cont.nuous and reliable supply of biomass t.at.can be produced at.a low cost.and wit. minimal use of wat.r, fert.lizer and arable land. As many C4 plant. have high light. wat.r and nit.ogen use efficiency, as compared wit. C3 species, t.ey are ideal as feedst.ck crops. We consider t.e product.vit. and resource use of a number of candidat. plant.species, and discuss biomass ＇qualit.＇, t.at.is, t.e composit.on of t.e plant.cell wall.

关键词： C4 Plant. as Biofuel Feedst.cks Opt.mising Biomass Product.on and Feedst.ck Qualit. from a Lignocellulosic Perspect.ve

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Digit.l imaging approaches for phenot.ping whole plant.nit.ogen and phosphorus response in Brachypodium dist.chyon

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Journal of Int.grat.ve Plant.Biology 2014年第8期56卷 781-796页

作者： Richard Poiré Vincent.Chochois Xavier R.R.Sirault.John P.Vogel Michelle Wat. robert t.furbank CSIRO Plant.Indust.y High Resolut.on Plant.Phenomics Cent.e CSIRO Plant Industry USDA-ARS West.rn Regional Research Cent.r

t.is work evaluat.s t.e phenot.pic response of t.e model grass （Brachypodium dist.cbyon （L.） P. Beauv.） t. nit.ogen and phosphorus nut.it.on using a combinat.on of imaging t.chniques and dest.uct.ve harvest.of shoot. and root.. Reference line Bd21-3 was grown in pot. using 11 phosphorus and 11 nit.ogen concent.at.ons t. est.blish a dose-response curve. Shoot.biovolume and biomass, root.lengt. and biomass, and t.ssue phosphorus and nit.ogen concent.at.ons increased wit. nut.ient.concent.at.on. Shoot.biovolume, est.mat.d by imaging, was highly correlat.d wit. dry weight.（R2 〉 0.92） and bot. biovolume and growt. rat. responded st.ongly t. nut.ient.availabilit.. Higher nut.ient.supply increased nodal root.lengt. more t.an ot.er root.t.pes. Phot.chemical efficiency was st.ongly reduced by low phosphorus concent.at.ons as early as 1 week aft.r germinat.on, suggest.ng t.at.t.is measurement.may be suit.ble for high t.roughput.screening of phosphorus response. In cont.ast. nit.ogen concent.at.on had lit.le effect.on phot.chemical efficiency. Changes in biovolume over t.me were used t. compare growt. rat.s of four accessions in response t.nit.ogen and phosphorus supply. We demonst.at. t.at.a t.me series image-based approach coupled wit. mat.emat.cal modeling provides higher resolut.on of genot.pic response t. nut.ient.supply t.an t.adit.onal dest.uct.ve t.chniques and shows promise for high t.roughput.screening and det.rmina- t.on of genomic regions associat.d wit. superior nut.ient.use efficiency.

关键词： Nut.ient. upt.ke phenomics phot.synt.esis root shoot.it.t.on: Poire R, Chochois V, Sirault.XRR, Vogel JP, Wat. M, furbank Rt.2o14) Digit.l imaging approaches for phenot.ping whole plant.it.ogen and phosphorus response in Brachypodium dist.chyon.

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