Potassium influx isotherms were obtaiwd for 10 cultvars of barley using plants which had been grown with or without potasslim ( (4,12,14). Despite extensive investigations by plant physiologists which have sought to characterize the underlying mechanisms ofion absorption, little attention has been paid to the potential practical application of these findings to the search for such strains.There are clear indications that ion absorption by plants is under genetic control and that considerable differences exist both between and within genera (7,8,13

NSunnary. 'I'lTe metalolismii of tryptophan by Taphrina deformnzn% has beell sttudie(d to confirimi the reported ability of this organism ti prod(luce trpl)tanine. Stich amine production was uot observed, (lespite tise of amille oxi(lase inhibitors at levels which should have resulted in the acculmiulationl of tryptamvine in the mie(liuimii. It has been ishown that the metabolites of tryptopbhln includ(e indolepvr-rnic aci(l, in(lolelactic acid, tryptophol, and indoleacetic acid. and that the original report of trypltamiline production muist be reevaltlated in light of the extraction l)rocedlures emiployed.WNhile miuch in(lirect evidence, stiimimiiarize(I in the reviews of Stowe (10)

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In Exp. 1, early-weaned Targhee and Polypay crossbred lambs (60 ewes and 66 rams; initial BW 24 +/- 1.0 kg) were used in a 2 x 3 factorial experiment to determine the effects of corn processing (whole shelled corn [WSC] or ground and pelleted corn [GC]) in combination with supplemental fiber (none [control]; soybean hulls, SBH [highly digestible]; or peanut hulls, PH [highly indigestible]) on DMI, ADG, feed efficiency, and visceral organ weight. For the total trial, WSC resulted in a 4% increase (P < .01) in ADG vs GC, and supplemental fiber resulted in increased (P < .01) DMI and ADG vs the control diet. Experiment 2 was conducted using 12 Targhee and Polypay crossbred wether lambs (initial BW 25 +/- 7 kg) to determine the effects of corn processing and fiber source in high-concentrate diets on diet digestibility and N retention using the same diets as in Exp. 1. Lambs fed WSC had greater (P < .001) apparent N digestion, true N digestion, and N retention (P < .01) than those fed GC. The apparent digestibilities of DM, OM, and NDF were greater (P < .001) for WSC than for GC diets. Peanut hulls resulted in decreased (P < .01) DM, OM, and NDF apparent digestibilities compared with the control and SBH diets. Starch digestion was not affected (P > .10) by diet. Whole corn resulted in improved DM, OM, NDF, and N digestibility compared with GC. Overall, both the SBH and PH diets resulted in greater DMI and ADG than the control diet, which lacked supplemental fiber.

No abstract