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选取了3种铁高效园艺作物,木本小金海棠,藤本葡萄‘SO4’,草本番茄‘合作906’,对其缺铁应答反应机制进行了分析和比较。结果发现,3种植物中缺铁处理都可以诱导Fe3+还原酶活性升高及根际pH下降;但在缺铁加去顶双重处理时,除番茄Fe3+还原酶活性升高和根际pH下降外,苹果和葡萄没有变化,说明苹果和葡萄中缺铁应答反应的调控有赖于地上部系统信号的存在,而番茄中根系局部信号至少能够触发缺铁应答反应。分根处理表明,在苹果和番茄中部分根系缺铁可导致非缺铁根系产生缺铁应答反应,而葡萄中没有缺铁应答反应,说明苹果和番茄中系统信号可以诱发缺铁应答反应,而葡萄可能需要系统信号和根系局部信号的共同作用。研究还发现,缺铁可诱导苹果和番茄根毛的形成,葡萄则没有。以上结果表明,不同的物种缺铁应答反应的调控机制可能不同。
Three iron-efficient horticultural crops, Begonia tuberosum, Fujimoto grape ’SO4’ and herbaceous tomato ’906’ were selected and their response mechanisms to iron deficiency were analyzed and compared. The results showed that iron deficiency treatment could induce the increase of Fe3 + reductase activity and decrease of rhizospheric pH. However, in the treatment of iron deficiency plus topdressing, the Fe3 + reductase activity and the rhizosphere pH decreased , Apples and grapes did not change, indicating that the regulation of iron-deficiency responses in apples and grapes depends on the presence of signals from above-ground systems. Local signals in roots of tomatoes at least trigger iron-deficiency response. Root-part-treatment showed that some root-deficient apples and tomatoes could cause iron-deficient responses in non-deficient iron roots and no iron-deficient responses in grapes, indicating that system signals in apple and tomato could induce iron-deficiency responses Grapes may require the combination of a system signal and a root local signal. The study also found that iron deficiency induces the formation of apple and tomato root hairs, while grapes do not. The above results show that different species of iron deficiency response regulation mechanism may be different.