Showing papers on "Nigella damascena published in 1975"
TL;DR: The technique used does not stain centromeres in other plant species investigated, a fact which shows that the centromres of Nigella are in some way different, and the implications of this observation in relation to centromere polymorphism are discussed.
Abstract: The centromere regions of each chromosome in the complement of Nigella damascena (2n equals 2x equals 12) stain differentially with Giemsa at interphase and throughout all the principal stages of mitosis and meiosis. Each centromere is seen to consist of a pair of sister half-centromeres which appear as 2 differentially stained dots. The appearance and behaviour of these dots indicates that they are kinetochores. The technique used does not stain centromeres in other plant species investigated, a fact which shows that the centromeres of Nigella are in some way different. The implications of this observation in relation to centromere polymorphism are discussed.
84 citations
TL;DR: In the absence of kinetin, GA3 was required for organ initiation in Doubles but completely inhibited stamen initiation in Singles in Nigella damascena as mentioned in this paper.
Abstract: A B S T R A C T In Nigella damascena "double" flower is inherited as a single-gene recessive to "single" flower. Early emasculation of "double" flowers greatly inhibits gynoecium development and, to a lesser degree, development of sepals and bracts. No comparable inhibition of gynoecia was induced in "single" flowers though some sepal and bract inhibition was detected. A differential nutritional requirement for organ initiation on cultured flower apices was also detected. Apices of both varieties initiated stamens and carpels if kinetin was added to the basal medium. However, in the absence of kinetin, GA3 was required for organ initiation in "doubles" but completely inhibited stamen initiation in "singles." Both these differential effects are thought to reflect rather different patterns of gibberellin metabolism in the two genetic strains. DESPITE REPORTS which appear to implicate
13 citations
TL;DR: Une diminution très significative des taux de toutes les lésions chromosomiques a lieu entre les intervalles de temps 20 and 30 sec.
Abstract: Des graines «seches» de nigelles ont ete irradiees par des doses fractionnees (2×2 krads) d'electrons acceleres (34 MeV). Une diminution tres significative des taux de toutes les lesions chromosomiques a lieu entre les intervalles de temps 20 et 30 sec. Apres un traitement des graines par 2 agents de chelation (DP et DIECA), il y a suppression de l'effet.
2 citations
TL;DR: The lipase isolated from the seeds of Nigella damascena L. showed a pH optimum of 8, a temperature optimum of 37–40°C, a pH stability with an exposure of 30 min in the pH range from 3 to 12 and with exposures of 60 and 120 min inThe pHrange from 7 to 10.
Abstract: 1. A lipase isolated from the seeds ofNigella damascena L. showed a pH optimum of 8, a temperature optimum of 37–40°C, a pH stability with an exposure of 30 min in the pH range from 3 to 12 and with exposures of 60 and 120 min in the pH range from 7 to 10. Complete inactivation of the lipase takes place at 80°C.
1 citations
Journal Article•
1 citations