Responses of wheat and barley genotypes to toxic concentrations of soil boron

摘要: The growth and yield of seven wheat two barley cultivars or lines, previously found to show different degrees boron tolerance under field conditions, were compared in a pot experiment at range soil treatments. Soil treatments ranged up 150 mg/kg applied B. Extractable B soils 103 mg/kg. At the highest treatment seedling emergence was delayed, but percentage not reduced. degree toxicity symptom expression varied between with most tolerant, Halberd (Wq*KP)*WmH)/6/12, displaying least symptoms. concentration which produced significant depression cultivars. For example, (Wq*KP)*WmH)/6/12 affected 100 treatment, while grain for (Wl*MMC)/W1/10 significantly reduced 25 treatment. There linear increase tillers boot-stage increasing soil. tolerant genotypes had lowest tissue concentrations each approximately half more sensitive 50 Differential within also observed. Both Stirling total dry matter yields boot stage this 118 mg/kg, respectively. On other hand, 144 131 respectively, unaffected. relative responses experiment, wheat, close agreement results. yields, when grown high conditions field. In pots these proved be boron. advantage field, expressed by WI-2584 Stirling, repeated pots. was, however, than on basis production. results that useful variation exists among breeding should able provide levels