Response of Phaseolus vulgaris L. to Molybdenum Under Acid Conditions
Response of Phaseolus vulgaris L. to Molybdenum Under Acid Conditions
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酸性条件下菜豆对钼的响应
DOI：
10.2136/sssaj1981.03615995004500060027x
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
D. N. Munns
中科院分区：
文献类型：
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作者：
A. Franco;D. N. Munns
普通豆（Phaseolus vulgaris L.）生长在缺酸土壤（pH < 5.2）上，对钼（Mo）没有反应。在土壤和溶液培养中进行了温室和生长室试验，以(i)测试土壤酸度是否通过干扰钼的吸收或向根瘤的转运来阻止大豆对钼的反应；（ii）建立结核和其他植物部位Mo浓度之间的关系；（iii）评估不同品种对钼吸收的差异。6个品种中，pH值在4.8 ~ 5.8范围内对植株Mo浓度影响不大。在对品种委内瑞拉350进行的更详细的实验中，pH值（4.8至6.3）和温度（21至31°C）都不影响钼在土壤和溶液培养中广泛供应的浓度或分布。在不同的外部供给条件下，结核Mo浓度的变化小于茎部Mo。与茎中钼的相关性较好，与叶和根中钼的相关性较差。根系Mo与外部Mo关系密切，叶片在高Mo水平下发挥Mo处理汇的作用。一个大豆品种的茎和种子中钼含量高于其他5个品种。还注意到，在加利福尼亚州戴维斯（Entisol）生产的种子中，Mo的含量是巴西Goiana （Oxisol）生产的种子的10倍。这些数据证实，对种子Mo的遗传和环境控制可以帮助控制Mo缺乏症。
Common beans (Phaseolus vulgaris L.) have been found not to respond to molybdenum (Mo) when grown on deficient soils that were also very acid (< pH 5.2). Greenhouse and growth chamber experiments in soil and solution culture were done to (i) test whether soil acidity prevents Mo response in bean by interferring with Mo uptake or translocation to nodules; (ii) establish relationships between Mo concentrations in nodules and in other plant parts; and (iii) assess cultivar differences in Mo uptake. In the six cultivars studied, plant Mo concentrations were little influenced by pH in the range 4.8 to 5.8. In more detailed experiments with the cultivar Venezuela 350, neither pH (4.8 to 6.3) nor temperature (21 to 31°C) affected Mo concentration or distribution over a wide range of Mo supply in soil and solution culture. Nodule Mo concentration varied less than shoot Mo in response to varied external supply. It correlated with Mo in stems better than in leaves or roots. Root Mo related closely to external Mo. Leaves appeared to act as sinks for Mo disposal at high Mo levels. One bean cultivar accumulated more Mo in stem and seed than five other cultivars. It was also noted that Mo was 10 times higher in seeds produced at Davis, Calif., (on an Entisol) than at Goiana, Brazil (on an Oxisol). These data confirm that genetic and environmental controls on seed Mo can be manipulated to help control Mo deficiency.