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Báo cáo khoa học: "Self- and cross-pollination effects on pollen tube growth and seed set in holm oak Quercus ilex L"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Self- and cross-pollination effects on pollen tube growth and seed set in holm oak Quercus ilex L. | Ann Sei For 1997 54 447-462 Elsevier Inra 447 Original article Self- and cross-pollination effects on pollen tube growth and seed set in holm oak Quercus ilex L Fagaceae A Yacine1 F Bouras2 1 Laborutoire de génétique et evolution des populations végétales Université des sciences et technologies de Lille-I 59655 Villeneuve d Ascq cedex France 2 Departement de foresterie Institut national agronomique d El-harrach Algiers Algeria Received 22 February 1996 accepted 16 September 1996 Summary - Patterns of the self-incompatibility system have been more often described for hermaphroditic entomophilous and short-lived plant species. Quercus ilex is a long-lived monoecious anemophilous and highly self-incompatible species. We used pollination experiments to investigate phenotypic responses of the self-incompatibility system. Flowers from 14 individuals of the same stand were hand-pollinated with self-pollen cross-pollen from a single donor and a mixture of the two types. We observed a slower pollen tube growth and no or nearly no seed production after self-pollination. The more self-pollen tubes reach the style the more flowers will stop their ovule development resulting in a high flower abortion rate. In open pollination pollen load is not a limiting factor but incompatible pollen may reach stigma simultaneously or before compatible cross-pollen which will induce an early abortion of flowers. When pollination is qualitatively and quantitatively effective the regulation of seed production related to the resources availability acts by the late abortion of fruit. self-incompatibility pollen tube growth seed set Quercus ilex L Resume - Effets de 1 auto- et de I allopollen sur la croissances des tubes polliniques et la production de fruits chez le chêne vert Quercus ilex L . Les systèmes d auto-incompatibilite ont été plus frequemment étudiés chez des espèces hermaphrodites entomophiles et à courte generation. Quercus ilex est une espèce monoìque anémophile et à longue .