Light-mediated release of phytosiderophores in wheat and barley under iron or zinc deficiency

被引:27
作者
Cakmak, I [1 ]
Erenoglu, B
Gülüt, KY
Derici, R
Römheld, V
机构
[1] Cukurova Univ, Dept Soil Sci & Plant Nutr, TR-01330 Adana, Turkey
[2] Univ Hohenheim, Inst Pflanzenernahrung, D-70593 Stuttgart, Germany
关键词
barley; iron deficiency; light intensity; phytosiderophore; wheat; zinc deficiency;
D O I
10.1023/A:1004384712817
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The effect of varied light intensity (50 - 600 mu mol m(-2) s(-1)) on the rate of phytosiderophore release was studied under zinc (Zn) deficiency using a bread (Triticum aestivum L. cv. Aroona) and a durum wheat cultivar (Triticum durum Desf. cv. Durati) differing in zinc (Zn) efficiency and under iron (Pie) deficiency using a barley cultivar (Hordeum vulgare L. Europe). Plants were grown under controlled environmental conditions in nutrient solution for 15 days (wheat plants) or 11 days (barley plants). Phytosiderophore release was determined by measuring capacity of root exudates to mobilize copper (Cu) from a Cu-loaded resin. With increasing light intensity visual Zn deficiency symptoms such as whitish-brown lesions on leaf blade developed rapidly and severely in wheat, particularly in the durum cultivar Durati. In wheat plants supplied well with Zn, increases in light intensity from 100 to 600 mu mol m(-2) s(-1) did not clearly affect the rate of phytosiderophore release. However, under Zn deficiency increases in light intensity markedly enhanced release of phytosiderophores in Zn-deficient Aroona, but not in Zn-inefficient Durati. When Fe-deficient barley cultivar Europe was grown first at 220 mu mol m(-2) s(-1) and then exposed to 600 mu mol m(-2) s(-1) for 24 and 48 h, the rate of release of phytosiderophores was enhanced about 4-fold and 7-fold, respectively. Transfer of Fe-deficient plants from 600 to 50 mu mol m(-2) s(-1) for 48 h reduced the rate of release of phytosiderophores by a factor of 7. The effect of light on phytosiderophore release was similar regardless of whether the rate of phytosiderophore release was expressed per plant or per unit dry weight of roots. The results demonstrate a particular role of light intensity in phytosiderophore release from roots under both Zn and Fe deficiency. It is suggested that in the studies concerning the role of phytosiderophore release in expression of Zn or Fe efficiency among and within cereals, a special attention should be given to the light conditions.
引用
收藏
页码:309 / 315
页数:7
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