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首页> 外文期刊>Journal of Plant Physiology >Abscisic acid accumulation in the roots of nutrient-limited plants: Its impact on the differential growth of roots and shoots.
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Abscisic acid accumulation in the roots of nutrient-limited plants: Its impact on the differential growth of roots and shoots.

机译：脱落酸在营养有限的植物根部的积累：对根和芽的差异生长的影响。

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摘要

We describe the involvement of abscisic acid (ABA) in the control of differential growth of roots and shoots of nutrient limited durum wheat plants. A ten-fold dilution of the optimal concentration of nutrient solution inhibited shoot growth, while root growth remained unchanged, resulting in a decreased shoot/root ratio. Addition of fluridone (inhibitor of ABA synthesis) prevented growth allocation in favour of the roots. This suggests the involvement of ABA in the redirecting of growth in favour of roots under limited nutrient supply. The ABA content was greater in shoots and growing apical root parts of starved plants than in nutrient sufficient plants. Accumulation of ABA in shoots of nutrient deficient plants was linked to a decrease in leaf turgor. Increased flow of ABA in the phloem apparently contributed to the accumulation of ABA in the apical part of the roots. Thus, partitioning of growth between roots and shoots of wheat plants limited in mineral nutrients appears to be modulated by accumulation of ABA in roots. This ABA may originate in the shoots, where its synthesis is stimulated by the loss of leaf turgor.
机译：我们描述了脱落酸（ABA）参与控制营养有限的硬质小麦植株的根和芽的差异生长。营养液最佳浓度的十倍稀释抑制了芽的生长，而根的生长保持不变，导致芽/根比降低。氟啶酮（ABA合成抑制剂）的添加阻止了根系的生长分配。这表明在营养供应有限的情况下，ABA参与了生长的改向，有利于根系的生长。饥饿植物的芽和生长的根部中的ABA含量高于营养充足的植物。营养不足植物的芽中ABA的积累与叶片膨大的减少有关。韧皮部中ABA流量的增加显然促进了ABA在根尖的积累。因此，受矿质养分限制的小麦植物的根与芽之间的生长分配似乎受ABA在根中的积累的调节。这种ABA可能起源于新梢，在新梢中，叶片膨大导致其合成受到刺激。

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