Reference Report for IND89031228
| Title: | Developmental anatomy and morphology of fasciation in the soybean (Glycine max). |
| Authors: | LaMotte, C.E., Curry, T.M., Palmer, R.G., Albertsen, M.C. |
| Source: | Bot. Gazette 1988, 149(4):398-407 |
| Abstract: | The anatomy and morphology of 2 isogenic lines of soyabeans cv. Harosoy, one fasciated and the other not, were studied over the growing season. Fasciation resulted from a gradual elaboration of the shoot apical meristem along one transverse axis: a conical apex becoming a generative ridge. It did not result from a fusion of pre-existing apical meristems. Two weeks after sowing, apices of fasciated plants became wider than apices of nonfasciated ones. At 6 weeks, both stem fasciation and a 30-40% decrease in pith cell size became detectable at two-thirds of the way up the stem. At 7 weeks, leaf number was doubled and phyllotactic pattern altered in fasciated plants compared with normal ones. At 8 weeks, fasciated stem circumference was twice that of the normal stem. Cell number across the longest diam. of the fasciated stem was about one order of magnitude greater than that across the normal stem, based on measurements of pith cell dimensions. Pith cell shape was the same in both genotypes. The increased leaf number of fasciated plants was associated in time and position with an increase in the total number of stem vascular bundles and in the number of those exhibiting characteristics of sympodia. At seed maturity, that portion of the fasciated main stem that had increased in breadth as it had grown in length bore few or no fruits. The portion above, which had decreased in breadth as it had grown in length, was the most fruit-laden portion of the fasciated stem. Fasciated stems branched less than nonfasciated ones. Of the 3 kinds of branches observed on fasciated stems, only 1, the rarest, had an anomalous ontogeny. It derived from a bifurcation of the ridgelike apical meristem, whereas the others arose as axillary buds. |
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