TITLE Drought stress effects on photosynthetic rate and leaf gas exchange of wheat
AUTHOR M.R.B. Siddique
Institute of Postgraduate Studies in Agriculture, Gazipur-1703, Bangladesh
A. Hamid
Institute of Postgraduate Studies in Agriculture, Gazipur-1703, Bangladesh
M.S. Islam
Institute of Postgraduate Studies in Agriculture, Gazipur-1703, Bangladesh
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ABSTRACT Drought stress effects on photosynthetic rate and leaf gas exchange characteristics of four wheat cultivars were evaluated under semi-controlled conditions. Four cultivarsˇXKanchan, Sonalika, Kalyansona, and C306, grown in potsˇXwere subjected to four levels of water stress. Among the cultivars, Kalyansona showed the highest photosynthesis rates both at vegetative and at anthesis. Exposure of plants to drought stress led to noticeable decrease in photosynthesis rate, stomatal conductance and mesophyll conductance and a concomitant increase in intercellular CO2 concentration. Plants subjected to drought at the early vegetative stage displayed similar physiological characters subsequently under well-watered conditions as compared with control. Photosynthesis rates decreased with decrease in stomatal conductance, but a weak relationship between them implied that non-stomatal limitations to photosynthesis might have been in operation.
KEYWORD Drought stress; Leaf gas exchange; Photosynthesis; Triticum aestivum L;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 40 Number 2 April 1999, page 141-145, 5 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China