SEEDBORNE FUNGI OF FLAX AND THEIR EFFECT ON SEED GERMINATION | ||||
| Journal of Plant Production | ||||
| Article 9, Volume 33, Issue 8, August 2008, Page 5731-5747 PDF (864.26 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2008.170383 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. T. M. Mansour; A. A. Aly; H. M. El-Zefzaf | ||||
| Plant Pathology Research Institute, Agric. Res. Center, Giza, Egypt. | ||||
| Abstract | ||||
| Samples of seeds from 29 flax cultivars were used to study the effect of seven-year storage period on isolation frequencies of seedborne fungi. Ten of the cultivars were chosen to study the effect of storage period on seed germination. Storage of flax seed for 6 years had no deleterious effect on seed germination; however, a sharp decrease in viability of seed was observed in the seventh year. Clay cv. showed the lowest germination (8%) in the seventh year. A liner relationship was observed between storage period and germination for cvs. Ottawa 770B, Marshall, and C.I. 2008. Sixteen fungi were isolated from flax seeds over seven years. The isolated fungi were, Alternaria alternata, Stemphylium botryosum, Aspergillus flavus, A. niger, Chaetomium sp., Cladosporium sp., Drechslera sp., Epicoccum sp < em>., Fusarium solani, F. oxysporum, Nigrospora sp., Penicillium sp., Phoma sp., Stemphylium sp., Trichoderma sp., and Verticillium sp. In all years, no single cultivar yielded all the 16 fungi, and the frequency of fungi was affected by storage period. In the present study, linear correlation analysis was used to determine colonization incidence (CI)-colonization severity (CS) relationship of flax seedborne fungi over the seven-year period. The analysis revealed that CI-CS relationship of flax seedborne fungi conformed to the linear model regardless of the storage period within a six-year period-that is, the easily measured incidence values can be used for assessment of CS. A significant correlation between CI and CS was lacking in 2006. CI was less sensitive to storage period compared with CS. Isolation frequencies of some fungi were significantly correlated with seed germination. Most of these correlations were negative, which may indicate the presence of causal relationship between seedborne fungi and seed germination. Data for seed germination and frequencies of fungi, isolated from seeds, were entered into a computerized stepwise multiple regression analysis. Using the predictors supplied by the stepwise regression, seven models were constructed to describe the relationship between seed germination (dependent variable) and frequencies of the isolated fungi (independent variables or predictors). The R2 values of the models ranged from 12.50 to 50.20%, which indicates that seedborne fungi of flax play a minor role in determining variability in seed germination- that is, most of this variability is attributed to the effects of other biotic and abiotic factors. | ||||
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