The aluminium response network in wheat (Triticum aestivum L.): I. The root growth reactions

R. Bennet
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引用次数: 11

Abstract

The mechanistic basis of Al rhizotoxicity was investigated through a time-based analysis of the growth reactions seen in hydroponically-grown roots of wheat isolines (IS and IT) differing in Al tolerance, when exposed to 75 μM Al (pH 4.1) for times ranging between 2 minutes and 48 h. Notwithstanding genotypic differences in the timing and the magnitude of the reactions, it was clear that the root growth adjustments made in response to Al involved three phases, 1) the primary response (IS and IT ≤ 60 min) which produced a net increase in root extension growth, 2) an intermediate period of growth inhibition (IS, 6 h; IT, 24 h.) and 3) recovery (IT 48 h) which included growth stimulation. Close relationships also emerged between the time-dependent, Al-induced increases and decreases in root extension growth and the volume (length) of the root cap and the length of root epidermal cells which suggested that cap volume and root epidermal cell extensibility may also be components of the Al response network. Thes...
小麦(Triticum aestivum L.)的铝响应网络:1 .根系生长反应
在75 μM的Al (pH 4.1)环境中,暴露时间在2分钟到48小时之间,通过对不同铝耐受性的小麦水培根系(IS和IT)生长反应的时间分析,研究了铝根毒性的机制基础。尽管反应的时间和强度存在基因型差异,但很明显,根系对铝的生长调节涉及三个阶段。1)初效期(IS和IT≤60 min),根系伸长生长净增加;2)中期生长抑制期(IS, 6 h;IT, 24小时)和3)恢复(IT 48小时),其中包括生长刺激。时间依赖性、铝诱导的根伸长生长的增减与根冠的体积(长度)和根表皮细胞的长度也存在密切的关系,这表明根冠的体积和根表皮细胞的伸长也可能是铝响应网络的组成部分。帖前……
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