| Abstract: | Eight day old greenhouse grown Phaseolus vulgaris L. seedlingswere exposed to three different temperature regimes. The concentrationof the total free nucleotides, nucleoside triphosphates, RNAand protein was much more pronounced in seedlings exposed tothe interactive day/night temperature of 28 ?C (soil) and 15?C (air) of regime I. Seedlings treated to a low soil/air, day/nighttemperature of 15 ?C (regime II) had the lowest content of totalfree nucleotides, nucleoside triphosphates, RNA and protein.The nucleoside triphosphate content and energy charge valueof seedlings treated to a high soil/air, day/night temperatureof 28 ?C (regime III) declined much earlier than in the seedlingsexposed to temperature regimes I and II. The fresh and dry weightof seedlings exposed to temperature regime I was significantlyhigher than those seedlings exposed to the other two temperatureregimes. The slowest growth was observed in seedlings exposedto temperature regime II. The noticeably higher concentrationof ATP, pyridine nucleotides and root nodulation in seedlingsexposed to temperature regime I suggests that higher soil andlow air temperature enhances nitrogen metabolism in P. vulgarisseedlings. |
