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Screening of Tobacco Genotypes for Phytophthora nicotianae Resistance

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Influence of CaCl(2) on the foliar biomass and quality of tobacco leaves.

J M Ruiz¹, L Romero

¹Department of Plant Biology, Faculty of Sciences, University of Granada, 18071-Granada, Spain.

Journal of Agricultural and Food Chemistry

|August 22, 2001

Summary

Calcium chloride (CaCl2) application at 1.25 mM increased tobacco leaf biomass by enhancing nitrate assimilation. However, this dosage negatively impacted tobacco quality, increasing nitrate and nicotine levels while reducing sugars.

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Area of Science:

Agricultural Science
Plant Physiology
Agronomy

Background:

Tobacco (Nicotiana tabacum L.) quality is influenced by nutrient management.
Calcium chloride (CaCl2) is a key nutrient affecting plant growth and biochemical composition.

Purpose of the Study:

To investigate the effects of varying CaCl2 dosages on tobacco (Nicotiana tabacum L. var. Tennesse 86) foliar biomass and quality.
To determine the optimal CaCl2 concentration for balancing biomass production and quality attributes.

Main Methods:

Tobacco plants were cultivated under controlled conditions with standard fertilization.
CaCl2 was administered via nutrient solutions at three concentrations: 1.25 mM (T1), 2.5 mM (T2), and 5 mM (T3).
Foliar biomass, nitrate (NO3-), nicotine, and reducing sugar concentrations were analyzed.

Main Results:

The 1.25 mM CaCl2 dosage (T1) significantly enhanced foliar biomass production, likely due to stimulated nitrate assimilation.
However, T1 treatment resulted in higher leaf nitrate and nicotine concentrations, detrimental to human consumption quality.
Conversely, T1 treatment led to a decrease in leaf reducing sugar content compared to T2 and T3.

Conclusions:

Low CaCl2 application (1.25 mM) promotes tobacco leaf biomass but compromises quality by increasing undesirable compounds.
A direct relationship exists between increased foliar biomass, nitrogen, and chlorophyll content and a decline in tobacco quality.
Optimizing CaCl2 dosage is crucial for managing tobacco yield and quality, balancing growth with consumer safety.