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SUMMARYA comparison of the protein content and patterns in root extracts from non-mycorrhizal and vesicular-arbuscular mycorrhizal [Glomus mosseae (Nicol. et Gerd.) Gerd. et Trappe] red clover {Trifolium pratense L.) has been made. Soluble protein content was higher in mycorrhizal than in non-mycorrhizal roots. After separation by DEAEcellulose chromatography and electrophoretic analysis, several additional polypeptides appeared in mycorrhizal extracts. In addition, it seems that one of the additional proteins was a plant-induced superoxide dismutase isozyme.

.ManK^incsc a\'ailahtltt\' in .soils iticrcascs witli sotl acidit\\ llu' clement reachitiLi; toxic lc\cls for jilatit fj;r()vvth \n sotnc situations. 'I'his toxic ellcct ts usualK o\ crcome hy the ailtlitioti of lime. Iti fact, tiiati^ancsc toxtctty ts rarely ohscrvcci tti )irotiuctt\-c areas (Smtth & I'xltncadcs, l*'S,'i), \c\ crtlicioss, tiiatiy acici sotls cotitaiti ctioufjjli niatiLjaticsc to recincc platit growth but not to load to clc\ clo]itnctit of toxicitN' sytiiptotiis in tlif phmt. The coniplexinf^ actioti ol ()rfj;amcmatter prohahly reduces the atnoLtnt ol axatlahlc Mti tti sotl atiei the destructton ol that acttoti coLikl prohaliK tclcase-ctioLtgh Mti to liattii cle\ elopitip latits. Ahitiijatu'sc toxicity le\cls can also he roachctl wheti soils aie stcatn-sterilix.etl to tlestrox sotl mtcrollofa, as ohser\ecl in oitr lahorator\\ Sotne studtes oti \ cstculat-arhtiscular (\ .\) mycorrhtzal lutif^i ha\-e reported a lower uptake ol Mti h>' m>c<)rrhizal tlnan noti-mycorrhi/.al plants (.Armes. \ tiartiio & .Sattiz, I')(S7), sti^i^a'stinij; a protecttvc role ol the lutit^i af^ainst tnatisatiosc toxicit\' tti platTts ([-"acoNsky, 1')

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