Effect of Colonization of Pear Stigmas by Pseudomonas syringae pv. syringae on Fruit Set
| Autor: | E. Lucienne Mansvelt, F.J. Calitz |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | HortScience. 29:74-75 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.29.2.74 |
| Popis: | Packham's Triumph' (Pyrus communis L.) pear blossoms were inoculated with Pseudomonas syringae pv. syringae van Hall upon emasculation and then hand-pollinated at different times to assess the effects of bacterial colonization on fruit set. The pathogen significantly reduced fruit set by 24%. No lesions developed on pear flowers at any stage of the trials. Fruit set in the pear-producing areas of the southwestern Cape Province of South Africa is often poor, and in some years >90% of fruitlets abscise. Bacterial blossom blast caused by Pseudomonas syringae pv. syringae (P. s. pv. syringae) (Mansvelt and Hattingh, 1986) contributes to limiting pear production. Dor- mant buds harbor the pathogen and, at bud swell, open and supply primary inoculum. Flowers are infected in early spring during wet, humid conditions. A previous study has shown that the stigmas are important sites of colonization by the bacterium (Mansvelt and Hattingh, 1987). Occupation of pearl millet (Pennisetum americanum (L.) Leeke) stigmas by the ergot fungus restricts pollination (Wil- lingale et al., 1986). This study was under- taken to determine if bacterial colonization of the pear stigma by P.s. pv. syringae influences pollination and fruit yield. |
| Databáze: | OpenAIRE |
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