IRON-DEFICIENCY STRESS-INDUCED MORPHOLOGICAL AND PHYSIOLOGICAL-CHANGES IN ROOT-TIPS OF SUNFLOWER
IRON-DEFICIENCY STRESS-INDUCED MORPHOLOGICAL AND PHYSIOLOGICAL-CHANGES IN ROOT-TIPS OF SUNFLOWER
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DOI：
10.1111/j.1399-3054.1981.tb04512.x
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发表时间：
1981-01-01
影响因子：
6.4
通讯作者：
MARSCHNER, H
中科院分区：
文献类型：
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作者：
ROMHELD, V;MARSCHNER, H
以缺铁向日葵（Helianthus annuusL.）为试材，研究了缺铁对向日葵形态和生理的影响。CV. Sobrid）根。这些变化，或所谓的铁应力反应，仅限于根尖。典型的形态学变化包括根皮层中的额外细胞分裂和根毛的增强形成，导致根直径的增加（“膨大的根尖”）。这些形态变化与生理变化相关，如质子释放增加，根皮层中酚类物质的积累，以及根还原铁-III化合物的能力增加（“还原能力”）。一个显着增加的能力，根尖采取和转运铁发生同时发生这些变化。有很好的证据表明，这些形态和生理变化反映了一种有效的调节机制，用于增强根际微溶性铁III化合物的动员和向日葵植物对铁的吸收。
Typical morphological and physiological changes were observed in iron deficient sunflower (Helianthus annuusL. cv. Sobrid) roots. These changes, or so‐called iron stress reactions, are exclusively confined to the root tips. Typical morphological changes included additional cell division in the rhizodermis layer and enhanced formation of root hairs, leading to an increase in root diameter (“swollen root tips”). These morphological changes were correlated with physiological changes such as increased release of protons, accumulation of phenols in the rhizodermis, and an increased ability of the roots to reduce iron‐III compounds (“reducing capacity”). A marked increase in ability of the root tips to take up and translocate iron occurred simultaneously with these changes. There is good evidence that these morphological and physiological changes are reflections of an effective regulatory mechanism for enhanced mobilization of sparingly soluble iron‐III compounds in the rhizosphere and for iron uptake by sunflower plants.