RAPD-based assessment of genetic similarity and distance between Lupinus species in section Albus.
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Lupinus
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Lupinus
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The new species Armeria saviana , endemic to an isolated mountain chain of the Tyrrhenian Antiappennine system in south Tuscany, central Italy, is described and illustrated. The plant is diploid with 2n=18. It can be distinguished from the related species A. denticulata (Bertol.) DC and A. canescens (Host) Ebel, mainly by leaf characters, capitula, bracts and flowers. The systematic position of the controversial taxon A. majellensis Boiss. subsp. ausonia F. Bianchini, to which the new species has formerly been assigned by some authors, is discussed. A lectotype for A. denticulata is designated.
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• Background and Aims Flowering incidence in Bambusa tulda has a high socio-economic impact. The aim of the present study was to describe the species for morphological characters (vegetative and reproductive) as well as molecular markers in order to enable species identification at various stages of the life cycle. • Methods Thirty-two key morphological characters (15 culm and 17 culm-sheath) were studied along with detailed inflorescence and floral characters. Incidence of sporadic flowering was recorded. Genomic DNA was isolated from leaves collected from 17 eco-geographical locations and RAPD profiles were generated. • Key Results The description of culm, culm-sheath, inflorescence and floral morphology are in agreement with the prior taxonomic description by Gamble in 1896, but in this communication a more detailed description and illustrations are presented. No seed set was recorded following sporadic flowering, probably due to prezygoting isolating mechanisms (herkogamy or protandry). All 17 populations surveyed generated identical RAPD profiles. • Conclusions Sporadic flowering may occur in B. tulda, but may not necessarily be followed by gregarious flowering, and does not result in seed production.
Bambusa
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In this study the chromosome number and morphology of five taxa of the Coronopus D.C. section – Plantago coronopus subsp. coronopus L., P. coronopus subsp. commutata (GUSS.) PİLGER, P. crassifolia FORSSKAL, P. maritima L., and P. holosteum SCOP. (Plantaginaceae) – in Turkey were investigated using karyological techniques. The seeds of taxa were collected from natural habitats. The chromosome numbers are determined for four taxa (P. coronopus subsp. coronopus, P. coronopus subsp. commutata, P. crassifolia and P. maritima) as 2n = 4x =20 and one taxon (P. holosteum) as 2n = 2x = 12. The chromosome numbers and karyotype analysis of the species are reported for the first time for Turkey.
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Plantago
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Bradyrhizobium
Lupinus
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Mesorhizobium
Bradyrhizobium japonicum
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Application of 1.5 μg indoleacetic acid (IAA) in a lanolin droplet to the exposed apical meristem of Lupinus albus seedlings caused: (1) axillary buds to form closer to the apex than normal, (2) displacement of primordia formed during the first two plastochrons following treatment, and (3) significant increases in concentration of RNA, protein, and unsaturated lipids in the meristems. Primordial displacement tended to be random relative to the site of the treatment, which may be a feature common to dicotyledonous plants exhibiting spiral phyllotaxis. That IAA conferred initiation site capabilities to all of the peripheral zone for a short time was indicated by (2) and (3) above, and by decreases in concentrations of the observed compounds toward control levels after the second plastochron following treatment. Effects of IAA on RNA suggest that nucleic acid metabolism, and possibly gene action, was involved in the response. Kinetin or gibberellic acid had no apparent morphogenetic effect on Lupinus meristems.
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Detailed light and electron microscopical studies on the diatom genus Berkeleya Grev. clarify relationships between the four species and support the separtion of B. fragilis and B. micans as two distinct taxa.
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Circumstantial evidence
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