Potássio na Planta

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description

UNIVERSIDADE DE SÃO PAULO ESCOLA SUPERIOR DE AGRICULTURA “LUIZ DE QUEIROZ” Projetando Agricultura Compromissada em Sustentabilidade PACES O papel do Potássio nos vegetais Daniele Tavoni Longhim Lucas Ryuichi Muraoka Vitor Alencar de Matos Piracicaba – SP Junho 2011 Introdução O presente trabalho trata do potássio na planta, dada sua importância enquanto macronutriente visto que o cátion tem participação em muitos processos biológicos da planta, alguns deles de importância vital. Foram abord

Transcript of Potássio na Planta

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Hmpzf`yäçf

F ~ziwimpi pzkjkcbf pzkpk `f ~fpëwwhf mk ~ckmpk# `k`k wyk ho~fzpêmghk im{ykmpf

okgzfmypzhimpi uhwpf {yi f gëphfm pio ~kzphgh~käçf io oyhpfw ~zfgiwwfw jhfc÷dhgfw `k ~ckmpk#

kcdymw `iciw `i ho~fzpêmghk uhpkc- Efzko kjfz`k`fw fw ~zhmgh~khw p÷~hgfw gfof kjwfzäçf#

ofjhch`k`i# eymäùiw jhf{yïohgkw i ehwhfc÷dhgkw# `iehghìmghk i pfrh`k`i-

Kjwfzäçf i ofjhch`k`i i `f ~fpëwwhf mk ~ckmpk 

F ~fpëwwhf"A(# è yo `fw gëphfmw okhw kjym`kmpiw io pf`kw kw gycpyzkw# ~fwwyh uëzhfw iwpk`fw

gfof f ohmizkc# pzfgëuic i wfcüuic i è hmgfz~fzk`f ~icfw uidipkhw ~fz oihf `i `heywçf mk efzok

wfcüuic- Miwwi ~zfgiwwf# mf {ykc è kjwfzuh`f `k wfcyäçf `f wfcf gfmpzk f dzk`himpi `i

gfmgimpzkäçf# yphch|k/wi f KP^ gfof efzok `i imizdhk ~kzk zikch|kz f ~zfgiwwf `i kjwfzäçf#

ek|im`f k irpzywçf `f B! ~kzk f oihf irpizmf i kjwfzuim`f f ~fpëwwhf ~kzk f oihf gicyckz- Iwpi

è gkzzidk`f kpzkuèw `f ~ckwokciok i `f pfmf~ckwpf ~fz pzkmw~fzpk`fziw i gkmkhw bh zfeïchgfw#{yi wçf `i `fhw ph~fw # f ~zhoihzf ~fwwyh gfmgimpzkäçf jkhrk i kcpk kehmh`k`i# lë f widym`f

~fwwyh ~fygk kehmh`k`i- F pzkmw~fzpi ~ick zkh| è zikch|k`f ~icf k~f~ckwpf i who~ckwpf i iwpk

pzkmweizìmghk `i ~fpëwwhf è zikch|k`k ~ick ~kwwkdio `f mypzhimpi ~ickw gècyckw k`lkgimpiw kpè f

ukwf `f rhciok ~icf oihf `k gfzzimpi pzkmw~hzkp÷zhk i uhk k~f~cëwphgk- Lë mf ecfiok# f A è f

gëphfm `fohmkmpi# pzkmw~fzpk`f k cfmdkw `hwpêmghkw gfof# ~fz irio~cf# kpè k efcbk-

^kzk k kjwfzäçf `f A irhwpio ukzhkw pifzhkw# io XKOK@K i ZFJIZPW ":>>9( f KP^ è yphch|k`f

`hzipkoimpi ~icf gkzzidk`fz `f ~fpëwwhf# `iwpi of`f fgfzzim`f irpzywçf `i B! i kjwfzäçf `i

A# f ~z÷~zhf gkzzidk`fz ~f`i wiz k jfojk `i B! icipzfdìmhgk# wydizi Cifmkz` ";829 k~y`

XKOK@K i ZFJIZPW :>>9( {yi f pzkmw~fzpk`fz wilk yok ~zfpiïmk iw~igïehgk# `i efzok {yi fgfo~cirf ~zfpèhgf `k pzkmwoiojzkmk "gfmwphpyhmpi `i yo gkmkc k{yfwf( gfof yo ~fzpçf {yi

wi kjzi i eigbk# kyrhchkm`f mkw `hehgyc`k`iw `k gkok`k `y~ck ch~ï`hgk `f ~ckwokciok-

K kjwfzäçf `i A wfezi hmecyìmghk `i ekpfziw hmpizmfw gfof gfmgimpzkäçf mk zkh|# gkzjfh`zkpfw i

ukzhi`k`i `f gycphukz- K gfmgimpzkäçf mk zkh|# miwpi gkwf# io ";875 Bfkdckm` i Jzfxiz k~y`

XKOK@K i ZFJIZPW :>>9( yphch|kzko zkï|iw `i ~ckmpkw# gycphuk`kw io jkhrfw mïuihw wkchmfw i io

jkhrkw pimwùiw `i F: uizhehgkm`f/wi {yi f kyoimpf `i gfmgimpzkäçf `i A mf pigh`f ciuk k yok

`hohmyhäçf `f ecyrf `i B! i gfmwi{yimpioimpi `k kjwfzäçf `f gëphfm A! ~ick zkh| "CIFMKZ@#

;8291 CKYGBCH# ;828(- Fw gkzjfh`zkpfw mk zkh|# wçf efmpi `i imizdhk kpzkuèw `k efwefzhckäçf

frh`kphuk# {yi wi `ë pzkmw~fzpi icipzðmhgf pizohmkc `k ziw~hzkäçf mk ~kzpi `i ukzhi`k`i#

gycphukz# bïjzh`f< K iehghìmghk `k yphch|käçf è `iehmh`k ~ick ir~ziwwçf<

I? "gfcbihpk/;(-" mypzhimpi kjwfzuh`f/;(- "ghgcf/;( 

Mf impkmpf# pkojèo piofw k ~ziwimäk `fw ekpfziw irpizmfw gfof k gfmgimpzkäçf `i A ! 

"Ghmèphgk `i wkpyzkäçf(1 f gëcghf# {yi gfmefzoi f kyoimpf `f mïuic# `hohmyh k kjwfzäçf ~fz

hmhjhäçf gfo~iphphuk1 f w÷`hf# {ykm`f efzmigh`f io gfmgimpzkäùiw kcpkw# `hohmyh k gfmgimpzkäçf

`i A!" eymghfmkoimpf `i oigkmhwof `y~cf(- Kcèo `hwwf# k pimwçf `f F : migiwwhpk `f kz ~kzk

kjwfzäçf `i A i `i fypzfw ïfmw "Bfkdckm` i Jzfxiz# ;875( io wyk gfmpzhjyhäçf ~kzk k ~zf`yäçf

`i KP^- Piofw pkojèo k hmecyìmghk `k yoh`k`i# gylk zi`yäçf gkywk yok `hohmyhäçf mkkjwfzäçf `i A# ~f`im`f wiz zigfo~imwk`f gfo f kyoimpf `k gfmgimpzkäçf `f gëphfm mf wfcf-

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^fz eho# piofw k hmecyìmghk `k pio~izkpyzk# gylf kyoimpf iwphoyck k kphuh`k`i ziw~hzkp÷zhk#

fgkwhfmkm`f yo kgzèwghof mk uicfgh`k`i `i heywçf# gfmwi{yimpioimpi pkojèo k `heywçf-

F ~fpëwwhf è `i zë~h`k pzkmwcfgkäçf# {yi è zikch|k`k ~icfw gkmkhw iw~igïehgfw cfgkch|k`fw mk

oiojzkmk ~ckwoëphgk i mf pfmf~ckwpf- Fw gkmkhw `f A wçf fw okhw who~ciw# mkw wy~izekoïchkw `i

gkmkhw gkphðmhgfw# wçf gkzkgpizh|k`fw ~fz yok gyzpk wiäçf mk zidhçf `fw ~fzfw {yi è ziw~fmwëuic~ick wiciphuh`k`i `f mypzhimpi Bhcci ";885 k~y` XKOK@K i ZFJIZPW :>>9(-

Irhwpio gkmkhw `hzighfmk`fw ~kzk `impzf i ~kzk efzk `kw gècyckw mfw {ykhw f A! widyi f ~fpimghkc

icèpzhgf "^FPPFWHMI KM@LYW# ;880(- Gfof lë ghpk`fw# irhwpio `fhw ~zhmgh~khw dzy~fw `i whwpiok

`i pzkmw~fzpi# gfo okhfz wiciphuh`k`i "EFR i DYIZHMFP# ;882( i f gfo oimfz# iwpi

gfzziw~fm`i k kcpkw gfmgimpzkäùiw"OKPBYHW i WKM@IZW # ;884(-

[ykmpf î kjwfzäçf efchkz# irhwpio ~fygfw pzkjkcbfw zickghfmk`fw# ~fzèo mf wègycf RHR

Jfbm";244 ghpk`f ~fz THPPTIZ ip-kc-#;857( zickpk wfjzi k kjwfzäçf efchkz i wiy ieihpf mf

gziwghoimpf `kw gycpyzkw- Io gkwf `i k`yjkäçf gfo ~fpëwwhf# f A!

mk efcbk kgfmpigi mf~zhoihzf gfmpkpf gfo k i~h`izoi# fgfzzim`f jkzzihzk î ~imipzkäçf `iuh`f k ~ziwimäk `k

gypïgyck gizfwk# ~fwpizhfzoimpi ~kwwkm`f ~icf k~f~ckwpf i `i~fhw fgfzzi kjwfzäçf# ~fz oihf

`k pzkuiwwhk `f ~ckwokciok-

Mf gkwf `f gkeè# kw k~chgkäùiw `i AMF7 k ;)# kyoimpko k k ~fzgimpkdio `i ezypfw gizilk- F

ghpzfw {ykm`f k~chgk`f A# kjwfzui okhw wi zikch|k/wi yok kphuh`k`i wy~izehghkc gfof f Pzhpfm J/

;895 Gkcuizp " ;858 k~y` XKOK@K i ZFJIZPW :>>9(-

^k~èhw jhf{yïohgfw# ehwhfc÷dhgfw i oipkj÷chgfw `f ~fpëwwhf mk ~ckmpk 

F ^fpëwwhf iwpë kwwfghk`f k käùiw jhfeïwhgkw mk ~ckmpk# gfof k kjizpyzk i eigbkoimpf `i

iwpðokpfw i# io dzky okhw iw~igïehgf# î wimwhjhch`k`i kf pf{yi io iw~èghiw `i ~ckmpkw gfof#

~fz irio~cf# `fzoh`ihzkw "Ohofwk ~y`hgk( i ~ckmpkw gkzmïufzkw "`hfmiki oywgh~yck(- ^fwwyh

pkojèo ho~fzpkmpi ~kzphgh~käçf io ~zfgiwwfw jhf{yïohgfw `k ~ckmpk gfof# ~fz irio~cf# mk

`ieiwk gfmpzk ~kp÷dimfw "XKOK@K ip kc# :>>5(# ziw~fmwëuic ~ick kphukäçf `i okhw `i 9>

im|hokw# pzkmwcfgkäçf `i käügkziw "hmecyìmghk mf oigkmhwof `i pzkmw~fzpi `f ecfiok(# ~fwwyh

hmecyìmghk mf ~zfgiwwf `i efpfwwïmpiwi# yok ui| {yi k ehrkäçf `i dëw gkzjðmhgf mk ~ziwimäk `i

cy| iwpë kwwfghk`k î gfmgimpzkäçf `i ~fpëwwhf mk efcbk i mk zidyckäçf `f ~fpimghkc fwo÷phgf `kw

gècyckw# ekpfz ho~fzpkmpi ~kzk fypzfw ~zfgiwwfw gfof ~fz irio~cf kjwfzäçf i pzkmw~fzpi `i

ëdyk ~ick ~ckmpk "OKCKUFCPK# :>>5(- Io yok iwgkck uhwïuic f ~fpëwwhf hmecyimghk ~zfgiwwfwgfof k ~zf`yäçf `i ezypfw i dzçfw "wïmpiwi i pzkmw~fzpi `i koh`f i käügkziw(# kyoimpk k

ziwhwpìmghk `fw pigh`fw "iuhpk f kgkokoimpf `kw gycpyzkw(# gfmeizi yok oicbfz zigy~izkäçf `f

pigh`f ciwk`f k~÷w k hmeigäçf i okhfz ziwhwpìmghk k wigkw i dik`kw "Afzm`õzeiz# :>>5 (-

K zidyckäçf `f ~fpimghkc fwo÷phgf `kw gècyckw pio dzkm`i ~kzphgh~käçf `f ~fpëwwhf# io kcdyokw

gycpyzkw gfof f kcdf`çf ~fz irio~cf# okckpf i ~fpëwwhf wçf ziw~fmwëuihw ~fz gizgk `i 9>) `f

~fpimghkc fwo÷phgf `kw gècyckw- ;5) `f ~fpëwwhf `k ~ckmpk iwpë mkw zkï|iw# yok ~fzgimpkdio

zickphukoimpi kcpk i migiwwëzhk# uhwpf {yi è f cfgkc fm`i fgfzzi k kjwfzäçf `i ëdyk# {yi pim`i k

wi ofuiz wio~zi ~kzk k zidhçf `i oimfz ~fpimghkc- K {ykmph`k`i `i ~fpëwwhf ukgyfckz miwwk

zidhçf è ;&;> k ;&9 `k gfmgimpzkäçf `f ghpf~ckwok# kf ~kwwf {yi mkw efcbkw f ~fpëwwhf ukgyfckz

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è ¿ `k gfmgimpzkäçf `i A mf ghpf~ckwok mügcif i gcfzf~ckwpfw- F ~fpimghkc fwo÷phgf pkojèo è

f oigkmhwof yphch|k`f ~kzk gfmpzfckz k kjizpyzk i eigbkoimpf `fw iwpðokpfw# `i of`f {yi

{ykm`f kw gècyckw/dykz`k iwpçf püzdh`kw fw fwpïfcfw wi kjzio i kmkcfdkoimpi# {ykm`f iwwkw

gècyckw iwpçf gzimk`kw# fy wilk# gfo yo ~fpimghkc okhfz {yi f oihf irpzkgicyckz# fw fwpïfcfw wi

eigbko# iuhpkm`f ~iz`kw `i ëdyk- K ~ckmpk ~f`i jfojikz ïfmw `i ~fpëwwhf ~kzk ekufzigiz fy

mçf k kjizpyzk i eigbkoimpf `fw fwpïfcfw "Gkwpzf# :>>21 Okckufcpk# :>>5(

Mf gkwf `k kphukäçf `i im|hokw f ~fpëwwhf oy`k k gfmefzokäçf `k ofcègyck# k {ykc kyoimpk k

ir~fwhäçf `fw wïphfw kphufw ~kzk k chdkäçf gfo f wyjwpzkpf# ~fwwhjhchpkm`f f oigkmhwof gbkui/

eigbk`yzk `kw im|hokw- Io zickäçf î pzkmwcfgkäçf `i käügkziw f ~fpëwwhf ~fwwyh hmecyimghk mf

~zfgiwwf `i gkzzidkoimpf `f ecfiok# yo ~zfgiwwf {yi irhdi imizdhk `i KP^ gylk ~zf`yäçf

`i~im`i `f ~fpëwwhf- Ir~izhoimpfw zikch|k`fw io gkmk/`i/käügkz ofwpzko {yi ~ckmpkw

`iehghimpiw io A phuizko oimfz ofuhoimpkäçf `i käügkziw `k efcbk "efmpi( ~kzk f gfcof

"`zimf(- F ~fpëwwhf khm`k gfmpzhjyh ~kzk yok oicbfz iwpzypyzkäçf `k ~kzi`i gicyckz `k gècyck

uidipkc# `i of`f {yi k gycpyzk wi pfzmi oimfw wywgipïuic kf kgkokoimpf i îw dik`kw-

"Tkcchmefz` k~y` Okckufcpk# :>>51 Afzm`õzeiz# :>>5(

@iehghìmghkw# pfrh`k`i i zickäçf gfo k {ykch`k`i `fw ~zf`ypfw

Widym`f Whcuihzk i Gzfgfof ";822(# kw hmlüzhkw gkywk`kw k yok ~ckmpk ~ick ekcpk `f mypzhimpi

iwpçf hmphokoimpi zickghfmk`kw gfo f kyoimpf `k zickäçf M&A- F ~fpëwwhf kpyk mk wïmpiwi

~zfpèhgk# wyk `iehghìmghk kgkzzipk mk `hohmyhäçf `k ~zf`yäçf `i ehpfokwwk i kgüoycf `i

gfo~fwpfw mhpzfdimk`fw- Io `igfzzìmghk `iwwi `iwgfo~kwwf# piofw k zi`yäçf mf gziwghoimpf

i ~zf`yphuh`k`i `k ~ckmpk-

[ykm`f k `iehghìmghk `i ~fpëwwhf è kgimpyk`k# k ~ckmpk ~zf`y| k ~ypziwghmk "~fchkohmk( `iuh`f

kf kgyoycf `i kohmfëgh`fw- K ~ypziwghmk è ziw~fmwëuic ~ick gcfzfwi i ~fwpizhfz migzfwi mkw

okzdimw i ~fmpkw `kw efcbkw okhw uicbkw- È ho~fzpkmpi ciojzkz {yi kcdyokw ui|iw ~zkdkw gfof

k bicohmpfw~fzhfwi io gizikhw gkywko `kmfw wioicbkmpiw "OKCKUFCPK# :>>5(-

K ekcpk `i ~fpëwwhf# ciuk io kcdyokw gycpyzkw k `hohmyhäçf `fw ezypfw "gfof k ckzkmlk( i

`iehghìmghk `i eizzf hm`y|h`k `iuh`f f kgüoycf mfw m÷w hmeizhfziw- Io ~ckmpkw kmykhw k

`iehghìmghk ciuk k hmpizm÷`hfw okhw gyzpfw- Fypzf whmpfok `i gkzëpiz kmkpðohgf è k `heizimghkäçf

~zily`hgk`k `fw pigh`fw gfm`ypfziw i k ~iz`k `k kphuh`k`i gkojhkc- K gkzìmghk `i ~fpëwwhf iciuk

f pifz `i ëgh`fw fzdêmhgfw# zi`y| f pifz `i käügkz i koh`f io ÷zdçfw i ziwizuk kcèo `fkgüoycf `i ~ypziwghmk- [ykm`f k `iehghìmghk mçf è pçf kgimpyk`k# fw whmpfokw wçf wyphw# fgfzzi

oimfz ~zf`yäçf i gziwghoimpf-

[ykmpf k `fwiw irgiwwhukw `i ~fpëwwhf# gfmgimpzkäùiw ~fygf okhw kcpkw {yi f mfzokc `i

~fpëwwhf ~zf`y|io whmpfokw wyphw hdykhw k `iehghìmghk mçf kgimpyk`k- Mfzokcoimpi iwwiw whmkhw

w÷ wçf ~izgijh`fw {ykm`f gfo~kzkofw k ~ckmpk gfo ~fygk `iehghìmghk fy irgiwwf gfo yok

wk`hk-

F ~fpëwwhf io mïuihw kcpkoimpi irgiwwhufw ~zfufgk k `iehghìmghk hm`y|h`k `i okdmèwhf# ciukm`f

î gcfzfwi# gcfzfwi hmpizmizukc i îw ui|iw migzfwi gfof fgfzzi mf gkeè- Widym`f Afzm`fzeiz

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":>>5( k gfmgimpzkäçf `i gëcghf mk ~ckmpk pkojèo è keipk`k# gkywkm`f zi`yäçf `k ckoick

oè`hk# gfo~zfoiphoimpf `kw eymäùiw `k oiojzkmk ~ckwoëphgk i uk|koimpf `i wfcypfw -

^fz wiz ho~fzpkmpi mk ~zf`yäçf `i ~fchwwkgkzï`ifw# f ~fpëwwhf è f mypzhimpi okhw zi{yizh`f mk

jkpkpk# {yi kzok|imk f koh`f io dzkm`iw {ykmph`k`iw mfw pyjèzgycfw- Widym`f @hkhw i ^zkpiw

";845(# k jkpkpk kjwfzui ;;: ad ~fz bigpkzi `fw {ykhw 4> ad ehgko mfw pyjèzgycfw wim`f iwwiwiwwimghkhw k ~zf`yäçf `k eègyck# ho~fzpkmpi ~kzk kw {ykch`k`iw gychmëzhkw i `i gfmwizukäçf-

[ykm`f fgfzzi `iehghìmghk `i ~fpëwwhf mk jkpkpk# kw efcbkw k`{yhzio yo pfo uiz`i k|yck`f i kw

okhw uicbkw ehgko kokzick`kw widyhm`f k migzfwi i f iwgyzighoimpf mkw okzdimw i ~fmpkw- K

k`yjkäçf ~fpëwwhgk `iui wiz eihpk ~zieizimghkcoimpi gfo wycekpf `i ~fpëwwhf k~iwkz `i

k~ziwimpkz yo gywpf okhw kcpf {yi f gcfzipf `i ~fpëwwhf- F gcfzipf `i ~fpëwwhf `iui k~chgk`f

gfo gkypick# ~fhw f kgüoycf `i gcfzipf ~zfofui k `hohmyhäçf `f pifz `i eègyck-

Gfmgcywçf

^f`iofw gfmgcyhz {yi f ~fpëwwhf è yo mypzhimpi `i irpziok ho~fzpêmghk ~kzk k okmypimäçf i

`iwimufcuhoimpf `fw uidipkhw# yok ui| {yi ~kzphgh~k io `huizwfw ~zfgiwwfw jhf{yïohgfw i

ehwhfc÷dhgfw mk ~ckmpk- ^fzpkmpf# f ~zf`ypfz `iui iwpkz wio~zi kpimpf kfw whmpfokw `i

`iehghìmghk `i ~fpëwwhf# yok ui| {yi è oyhpf irhdh`f ~ick okhfzhk `kw gycpyzkw i k wyk ekcpk ~f`i

kgkzzipkz io ~iz`kw `i ~zf`yphuh`k`i i gfmwi{yimpioimpi ehmkmgihzkw-

Zieizìmghkw Jhjchfdzëehgkw<

OKCKUFCPK# I- Mypzhäçf Ohmizkc `i ~ckmpkw- Wçf ^kycf< I`hpfzk Kdzfmðohgk Giziw# :>>5

XKOK@K i ZFJIZPW- ^fpëwwhf mk kdzhgycpyzk jzkwhcihzk- ^hzkghgkjk< Kwwfghkäçf jzkwhcihzk ~kzk

~iw{yhwk `k ~fpkwwk i `f efwekpf# :>>9

Pzfib E-Z- i Pbfo~wfo C-O- Wfcfw i Eizphch`k`i f wfcf- Wçf ^kycf< Km`zih# :>>4-

Gkwpzf ^-Z-G-# Acydi Z-K# Wiwpkzh H- Okmykc `i ehwhfcfdhk uidipkc< ehwhfcfdhk `i gycphufw- Wçf ^kycf< I`hpfzk

Kdzfmðohgk Giziw# :>>2-

Afzm`õzeiz D- B- K~fwphck fpëwwhf- Yjizcêm`hk< Ymhuizwh`k`i Ei`izkc `i Yjizcêm`hk# :>>5