n Southern African Forestry Journal - Ploidy determination of black wattle () using stomatal chloroplast counts : research note




The arrangements of chloroplasts and numbers within the stoma were examined as a rapid indirect technique for the identification of ploidy level in black wattle (<i>Acacia mearnsii de Wild</i>). Chloroplast counts were made from stomatal guard cells from leaves of known diploid (2n=2x=26) and tetraploid (2n=4x=52) plants grown under nursery conditions. Three-month-old plant material was used and five plants were chosen at random across six lines (3 diploids, 3 tetraploids). For diploids the mean number of chloroplasts per stoma was 9, 89 ± 0, 170 and 22, 75 ± 0, 170 for tetraploids. Chloroplasts in diploid guard cells were polarized into the corners, while evenly distributed in the tetraploids. These differences noted between the ploidy levels were significant (P<0, 01). The analysis of stomatal chloroplast number and arrangement have proven to be an accurate indirect technique to distinguish between diploid and tetraploid black wattle.


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