Journal
JOURNAL OF PLANT NUTRITION
Volume 35, Issue 2, Pages 311-329Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2012.636133
Keywords
chlorosis; iron deficiency; iron-stress response; Kentucky bluegrass; phytosiderophore; leaf and root iron
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Funding
- Office of Research and Creative Activities of Brigham Young University, Provo
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Some Kentucky bluegrass (KBG; Poa pratensis L.) is susceptible to iron (Fe)-deficiency chlorosis. Under Fe-deficiency stress, phytosiderophore is produced and released by the roots of many grasses to solubilize soil Fe and enhance uptake. In other species, quantifying phytosiderophore screens for Fe-deficiency resistant cultivars. A hydroponic study was conducted at 1 and 10 mu M solution Fe to variously stress 'Baron', 'Award', 'Limousine', and 'Rugby II' KBG cultivars. One mu M Fe solution produced more Fe-deficiency stress in all cultivars compared to 10 mu M, resulting in greater chlorosis and phytosiderophore release but reduced shoot and root Fe concentrations and shoot weight. Of the four cultivars, Baron was the most susceptible to Fe deficiency and exhibited severe Fe chlorosis and low shoot Fe but, surprisingly, produced the most phytosiderophore. These results imply that Fe-deficiency susceptibility in KBG may be less related to phytosiderophore release and more related to inefficient uptake or utilization mechanisms.
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