Effects of Helminthosporium carbonum Toxin on Absorption of Solutes by Corn Roots 12
AUTOR(ES)
Yoder, O. C.
RESUMO
Susceptible corn roots exposed to the host-selective toxin of Helminthosporium carbonum took up and retained more NO3−, Na+, Cl−, 3-o-methylglucose, and leucine than did control roots. Stimulatory effects on uptake were more pronounced with freshly cut roots than with roots that were washed and aged. Solutes were accumulated against a concentration gradient, and toxin-treated tissues developed a steeper gradient than did control tissues. Toxin affected both the low and high affinity uptake systems for Na+ and Cl−. Toxin did not affect uptake of Na2−, K+, Ca2+, phosphate ion (H2PO4− and HPO4−), SO4−, and glutamic acid. No toxin-induced leakage of any solute tested was detected within 5 to 6 hr after initial exposure to toxin. The data suggest that toxin from H. carbonum does not cause the general plasma membrane derangement caused by other host-selective toxins. Instead, H. carbonum toxin may cause specific changes in characteristics of the plasmalemma, which result in increased uptake of certain solutes.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366536Documentos Relacionados
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