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Photosynthetic activity of flag leaves in diallel crosses of spring barley under varied nutrition and soil moisture

A.G. Górny
Cereal Research Communications
Vol. 29, No. 1/2 (2001), pp. 159-166
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/23786184
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Photosynthetic activity of flag leaves in diallel crosses of spring barley under varied nutrition and soil moisture
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Abstract

Effects of macro-nutrient and soil water shortages on the inheritance mode of the photosynthetic rate (A), transpiration rate (E), stomatal conductance (gs) and photosynthetic water use efficiency (A/E) of flag leaves were investigated in pot- and field-grown diallel sets (Ps+F2s) of spring barley. The relatively narrow genetic variation in the leaf characteristics diminished under less favourable or stress conditions. No such variation was found in the field under low NPK fertilization. Significant genotype-by-environment interactions were found only for A and E. The both GCA and SCA effects exhibited an importance for the CO2 exchange rate. The role of the additive and/or non-additive gene action for other characteristics was more erratic and altered due to the conditions used. In most cases, overdominance of genes was detected. The examined components of the gas exchange exhibited low or very low heritabilities ranging from 0.07-0.11 for A/E, followed by 0.06-0.30 for E, to 0.14-0.48 for A. These indices were much lower under field conditions and did not exceed 0.14. The results did not confirm the potential for a rapid genetic improvement of the efficiency of gas exchange of the flag leaves in spring barley of local collections.

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