http://hdl.handle.net/10451/3609 2013-06-20T03:33:29Z 2013-06-20T03:33:29Z Martins-Loução, Maria Amélia Catarino, F. M. http://hdl.handle.net/10451/4405 2011-10-31T18:19:05Z 1981-01-01T00:00:00Z

Title: Nuclear changes associated with callus induction in lobularia maritima Authors: Martins-Loução, Maria Amélia; Catarino, F. M.

1981-01-01T00:00:00Z Warden, Juan Martins-Loução, Maria Amélia Sousa, Hermínia C. de Sousa http://hdl.handle.net/10451/4341 2011-12-21T09:29:44Z 1980-01-01T00:00:00Z

Title: Cytophotometric contribution to the knowledge of ceratonia siliqua seed development Authors: Warden, Juan; Martins-Loução, Maria Amélia; Sousa, Hermínia C. de Sousa Abstract: Cytophotometric analysis of nuclear DNA content in differen áreas of young Ceratonia siliqua seeds were made. The relative DNA amount in 50 interphase nuclei per each area were determined using a Vickers M 85 cytodensitometer. The frequency distribuition of DNA content in individual nuclei falls in the 2C and 4C classes, with the predominance of 2C nuclei. The DNA content of normal endosperm nuclei range from 2C to 6C (external layer) or from 2C to 9C internal layer), with the predominance in both cases of 3C class, thus agreeing with the triploid constitution of this tissue. Some cases of abnormal, collapsed-like embryos, accompanied by diploid (2C and 4C classes) endosperm, were detected. The possible involvement of diploid endosperm in failure of embryos development, as frequently observed in Ceratonia siliqua, is discussed.

1980-01-01T00:00:00Z Catarino, F. M. Martins-Loução, Maria Amélia Medeira, Maria Clara http://hdl.handle.net/10451/4310 2011-10-19T01:28:37Z 1973-01-01T00:00:00Z

Title: Ecotypic variation in Lobularia maritima (L) desv Authors: Catarino, F. M.; Martins-Loução, Maria Amélia; Medeira, Maria Clara

1973-01-01T00:00:00Z Martins-Loução, Maria Amélia http://hdl.handle.net/10451/4309 2011-10-19T01:28:32Z 1992-01-01T00:00:00Z

Title: Propagação de sobreiros : que futuro? Authors: Martins-Loução, Maria Amélia

1992-01-01T00:00:00Z