TAILIEUCHUNG - Báo cáo khoa học: "Variation in the phenology of shoot elongation between geographic provenances of maritime pine (Pinus pinaster) - implications for the synchrony with the phenology of the twisting rust fungus"

Tham khảo luận văn - đề án 'báo cáo khoa học: "variation in the phenology of shoot elongation between geographic provenances of maritime pine (pinus pinaster) - implications for the synchrony with the phenology of the twisting rust fungus"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ann Sci For 1994 51 553-568 Elsevier INRA 553 Original article Variation in the phenology of shoot elongation between geographic provenances of maritime pine Pinus pinaster - implications for the synchrony with the phenology of the twisting rust fungus Melampsora pinitorqua ML Desprez-Loustau F Dupuis INRA Centre de Bordeaux station de Pathologie Végétale BP 81 F-33883 Villenave-d Ornon cedex France Received 18 March 1993 accepted 17 December 1993 Summary The phenology of shoot elongation was monitored for 2 or 3 years at 4 sites in France with 6 maritime pine geographic provenances. Within each provenance the onset of phenological stages especially the earlier ones was better predicted by heat sums than by calendar days. The accuracy of prediction could be increased by about 50 for the earliest studied stage from 19 to 10 d . However temporal and to a greater extent site effects were still observed for heat sums. These may be attributed in part to stressful environmental conditions for pine. The geographic provenances used represent a range of significantly different heat requirements the Tamjout from Morocco and the Leiria from Portugal provenances representing the earliest and the latest respectively with a difference of approximately 100 degree-days for a threshold temperature of 0 C . A positive correlation was observed between precocity and vigour though this could not explain differences in precocity between provenances. A comparison of pine and rust Melampsora pinitorqua phenologies monitored at the same sites in south-west France revealed that synchrony between the host-susceptible stages and the parasite-spore-producing stages did not always occur. The earliness of the Tamjout provenance predisposed it to greater rust infection than other provenances due to better synchrony with basidiospore production. Variations in host-parasite synchrony are discussed from an evolutionary perspective and in relation to the prediction of infection risk. maritime pine .

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