Ice-encasement injury at the cellular and membrane level

H÷fundur┌tgefandi┌tgßfußr┌tgßfusta­ur
Andrews Chris J., Pomeroy M. KeithB˙na­arfÚlag ═slands, BŠndaskˇlinn ß Hvanneyri, Rannsˇknastofnun landb˙na­arins, Rannsˇknast÷­ SkˇgrŠktar rÝkisins, Tilraunast÷­ hßskˇlans Ý meinafrŠ­i, Vei­imßlastofnun1989ReykjavÝk
Rit┴rgangurT÷lubla­Bls.
B˙vÝsindi257-61

gr-buv2-cja&mkp2.PDF

Frß vefstjˇra: Greinina Ý heild sinni er a­ finna Ý pdf-skjalinu hÚr a­ ofan

ABSTRACT

Studies on isolated cells of cold hardened winter wheat showed a passive leakage of amino acids and a loss in ion uptake proportional to the decline in survival. The detrimental effects were reduced by the addition of calcium to the medium. The ATPase activity in the plasma membranes was markedly reduced by HCO3 and ethanol in combination and similar reduction was recorded in ice encased cells. This supports the concept that ATPase activity of the plasma membranes is inhibited by the accumulation of anaerobic metabolites, and calcium has a stabilizing effect on the plasma membranes.

Key words: ATPase activity, calcium, ice encasement, plasma membranes, winter wheat.

YFIRLIT

┴hrif svellkals ß frumur og frumuhimnur

Rannsˇknir ß einst÷kum h÷r­nu­um frumum vetrarhveitis sřndu a­ amÝnˇsřrur leka ˙t ˙r ■eim og jˇnaupptaka minnkar Ý hlutfalli vi­ dau­a ■eirra af v÷ldum svellkals. KalsÝum Ý upplausninni dregur ˙r ■essum skemmdum. Virkni ATPasa Ý frumuhimnunum minnka­i verulega vi­ a­ fruman var sett Ý bl÷ndu af HCO3- og etanˇl og s÷mulei­is ef h˙n var svellu­. Ůetta sty­ur ■ß hugmynd a­ virkni ATPasa Ý frumuhimnunum ey­ileggist vi­ upps÷fnun loftfirr­ra ÷ndunarefna, en kalsÝum vir­ist auka jafnvŠgi­ Ý frumuhimnunni.