Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract only
Publication Acceptance Date: 11/4/2004
Publication Date: 11/4/2004
Citation: Jaradat, A.A., Olness, A.E., Gesch, R.W., Rinke, J.L., VanKempen, S.J. 2004. Comparative assessment of wild and semi-domesticated cuphea spp. [CD-ROM] ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, Wisconsin. Interpretive Summary:
Technical Abstract: Detailed morphological and agronomic characterization of Cuphea germplasm are important pre-requisites for the development of cultivars that can be managed by farmers. We quantified the level of divergence between accessions of two species (C. lanceolata and C. viscosissima) of the semi-domesticated Cuphea (SDC) and its wild parents (WC) for seed and plant chemical, physiological and agronomic traits. Five elements (Sr>Ba>Mn>Cu>P) totally discriminated among seed samples of SDC and WC. Mean seed area (7.05 mm**2), perimeter (10.2mm) and circularity (C0) (0.88) were 30.6, 7.5 and 22.5%, respectively, higher in SDC than in WC, with no significant improvement in C0 of seed produced during four consecutive years. Seventy and 30.0% of total variation in C0 were due to differences among and within years, respectively. Germination index and thermal time to 50% germination (D50) were 145 and 120%, respectively, higher in SDC. Temporal variance for germination in SDC (0.48) and WC (0.74) were significantly different. D50 variance components due to species, temperature and their interaction were 18.2, 65.6 and 7.15%, respectively. Fractal analysis (D0) of plant images totally separated SDC from WC accessions and resulted in 95.9 and 77.8% correct classification of C. lanceolata and C. viscosissima, respectively. The respective values for species among WC accessions were 94.6 and 82.0%. However, temporal D0 values were highly variable in SDC and WC due to indeterminancy. Number of flowers/plant, plant height and number of primary branches/plant, in decreasing order, were the most discriminating variables among and within species.