Amelioration of iron toxicity: A mechanism for aluminum-induced growth stimulation in tea plants

被引：46
作者：
Hajiboland, Roghieh [2 ]
Barcelo, Juan [1 ]
Poschenrieder, Charlotte [1 ]
Tolra, Roser [1 ]
机构：
[1] Univ Autonoma Barcelona, Biosci Fac, Plant Physiol Lab, Bellaterra 08193, Spain
[2] Univ Tabriz, Dept Plant Sci, Tabriz 51666, Iran
来源：
JOURNAL OF INORGANIC BIOCHEMISTRY | 2013年 / 128卷
关键词：
Acid soil; Growth stimulation; Hematoxylin; Morin; ACID SOILS; RESISTANCE; LOCALIZATION; AL;
D O I：
10.1016/j.jinorgbio.2013.07.007
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Tea plants (Camellia sinensis) are well adapted to acid soils with high Al availability. These plants not only accumulate high leaf Al concentrations, but also respond to Al with growth stimulation. Decreased oxidative stress has been associated with this effect. Why tea plants not exposed to Al suffer from oxidative stress has not been clarified. In this study, hydroponically grown tea plants treated with 0 to 300 mu M Al were analyzed for growth, Al and Fe accumulation, and Al distribution by means of morin and hematoxylin staining. Roots of control plants stained black with hematoxylin. This indicates the formation of a Fe-hematoxylin complex. Young leaves of controls accumulated more than 1000 mg Fe kg(-1) dry weight. This concentration is above the Fe-toxicity threshold in most species. Supply of Al stimulated growth and reduced Fe uptake and transport. These results indicate that Al-induced growth stimulation might be due to alleviation of a latent Fe toxicity occurring in tea plants without Al supply. (C) 2013 Elsevier Inc. All rights reserved.
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收藏
页码：183 / 187
页数：5
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