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Abstract Detail


Mineral Nutrition

Hacisalihoglu, Gokhan [1], Vallejos, E. [2], Kochian, L. [3].

Response to Cadmium as a Potential Hydroponic Screening Tool for Zinc Efficiency in Common Bean.

Selection and breeding of plants for Zinc (Zn) efficiency, ability to maintain reasonable yield under Zn deficiency, is a useful approach to increase production and quality on Zn deficient soils. Hydroponic experiments were conducted to investigate the responses of two bean cultivars (Phaseolus vulgaris L. cvs. Calima and Jamapa) to Cadmium (Cd). Bean seedlings were grown in chelate buffer nutrient solution with increasing Cd concentrations (0, 1, 2.5, 5, 10, and 25 microM). Plant height, taproot length, final shoot and root fresh weight, leaf symptoms, shoot and root [Cd], chlorophyll content and number of leaves were determined for 15 days. Toxic Cd levels inhibited the growth of seedlings. A concentration of 5 microM Cd appeared to be the threshold value for separating tolerant and susceptible lines. The results showed that tolerance to Cd toxicity was significantly correlated with Zn efficiency trait in bean. Overall, cv. Calima was highly resistant, while cv. Jamapa was very susceptible to Cd stress. The susceptible cv. Jamapa displayed a decreased shoot length, taproot length, chlorophyll content when grown at ≥5 microM [Cd].  This study demonstrated that Cd tolerance permitted the discrimination of Zn-efficient and Zn-inefficient bean lines. Therefore, measurement of Cd tolerance may provide a useful indirect criterion for screening of Zn efficiency in bean. The current status of this project and further detailed results will be presented.


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1 - Florida A&M University, Biology Department, 207 Jones Hall, Tallahassee, FL, 32307, USA
2 - Univ. Florida, Horticulture
3 - USDA-Plant, Soil & Nutr. Lab.

Keywords:
Zinc
Cadmium
bean
Zn deficiency
hydroponics.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P11014
Abstract ID:1277


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