Efficient selection of potato heterokaryons by flow cytometric sorting and the regeneration of hybrid plants |
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Authors: | Sylvia Waara Marie Nyman Anders Johannisson |
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Institution: | (1) Department of Agronomy, College of Agriculture, Shiraz University Shiraz, Iran |
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Abstract: | Drought is one of the important factors limiting crop production in arid and semi-arid regions. Four drought resistance criteria,
consisting of canopy temperature, stomatal resistance, transpiring area and rate of water loss by excised-leaves were examined
in two experiments conducted in optimum and stress moisture conditions in 1995. A randomized complete block design with four
replications and six genotypes was used for each experiment. Under optimum moisture conditions, there was a significant difference
in canopy temperature at midday between drought resistant and drought sensitive genotypes. A significant linear relationship
was also obtained between this criterion and yield reduction ratio as determined by Yr = 1-(Ys/Yp) (Ys and Yp = yield under stress and non-stress conditions, respectively), at the ear emergence stage. The only significant difference
between cultivars in respect to stomatal resistance in stress conditions was that of adaxial leaf surface in ear emergence
stage. No significant linear relationship was obtained between transpiring area and yield reduction ratio. Cultivars differed
in respect to rate of water loss (RWL) and initial water content (IWC) in ear emergence and grain filling in stress environment
only. Ultimately, three criteria namely canopy temperature, stomatal resistance and RWL, in explicated conditions were recognized
as benificial drought resistance indicators.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | canopy temperature drought resistance excised-leaf water status stomatal resistance transpiring area Triticum aestivum L |
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