Physiological Responses To Excess Boron In Wheat Cultivars

A. Metwally, R. El-Shazoly, A. Hamada
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引用次数: 11

Abstract

This study investigates the response of two wheat cultivars to boron toxicity stress. Plants were cultivated in sand culture and boron was applied to the culture for 10-day. Symptoms, tiller number, boron concentration, soluble sugars, proteins and other free amino acids than proline were studied. The differences between the cultivars were apparent from higher boron and the chlorosis in tolerant cultivar was about 7% compared to the sensitive one 70%. Tiller number gradual decreased in tolerant-cultivar, while in sensitive one a dramatic reduction was exhibited by increasing boron level in culture media. In most boron levels, although the accumulation of soluble carbohydrates was significantly stimulated in shoot of B-sensitive cultivar (Gemmeza 9; S), there were no appreciable differences in the production of carbohydrates in shoot of B-tolerant cultivar (Sakha 93; T). However, the soluble proteins production did not affect by most boron levels in both cultivars. The presence of boron at various concentrations induced a production of free amino acids in shoots of each of the two test cultivars. Tiller number (yield index) decreased in the two test cultivars and was in range 50-59 and 84-92% less than control plants for tolerant and sensitive cultivar, respectively.
小麦品种对过量硼的生理反应
研究了两种小麦品种对硼毒性胁迫的响应。采用砂培法栽培植株,施用硼10 d。研究了症状、分蘖数、硼浓度、可溶性糖、蛋白质和脯氨酸以外的其他游离氨基酸。高硼条件下品种间差异明显,耐硼品种的黄化率约为7%,而敏感品种的黄化率为70%。抗性品种分蘖数逐渐减少,敏感品种分蘖数随着培养基中硼含量的增加而急剧减少。在大多数硼水平下,尽管可溶性碳水化合物的积累在b敏感品种(Gemmeza 9;S),耐b品种(萨哈93;然而,两个品种的可溶性蛋白产量不受大多数硼水平的影响。不同浓度硼的存在诱导了两个试验品种枝条中游离氨基酸的产生。两个试验品种分蘖数(产量指数)下降,耐、敏感品种分蘖数(产量指数)分别比对照减少50 ~ 59%和84 ~ 92%。
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