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- Author or Editor: Patricia M. Harney x
- HortScience x
Abstract
The zonal geranium, Pelargonium X hortorum Bailey2, probably originated from hybridization of natural species of the subgenus Ciconium (Sweet) Harvey of the genus Pelargonium l’Her. ex Ait. (11, 25). Although P. zonale was introduced into Europe from South Africa in 1609, it was not until 1814 that other Pelargonium species reached Europe. Since interspecific hybridization is readily accomplished under greenhouse conditions, the plant breeders of the time soon produced a number of forms different from the wild species (10, 11). Pelargonium breeding has, therefore, been carried out for over 150 years and, as few records have been kept until quite recently, the problem of species classification and determining the phylogeny of the culti-gens is difficult (28).
Abstract
The viability of fresh pollen from 6 Rosa species (Rosa spinosissima L., R. fedtschenkoana Regel, R. pendulina L., R. arkansana Porter, R. Carolina L., R. virginiana Miller), one botanical variety (R. spinosissima altaica Rehd.) and 3 cultivars (‘Betty Bland’, ‘George Will’, ‘Prairie Princess’) were evaluated. Correlation between pollen staining and germination was positive and significant, but absolute pollen viability was found to be a better indicator of viability than staining. Rosa spinosissima and R. fedtshenkoana were considered to be the best pollen parents from the genotypes sampled.
Abstract
Explants of actively growing shoot tips from greenhouse-grown plants of ‘Vesper’ lilac (Syringa vulgaris L.) initiated new shoots in 2–4 weeks on a modified Murashige and Skoog (MS) revised medium plus 0.1 mg/liter 6-benzylamino purine (BA) and either 0.125, 0.25, or 0.5 mg/liter indoleacetic acid (IAA). These shoots were transferred for multiplication to the same medium but with 7.5 mg/liter BA and 0.1 mg/liter β-naphthaleneacetic acid (NAA). In 5–6 weeks about 6 shoots, 12–15 mm in length, had been produced per explant. There was no increase in the number of shoots by placing them in either a horizontal or inverted position compared to upright. Although excised shoots would root in vitro, rooting was more successful in vermiculite in a plastic-covered flat.
Abstract
This study was initiated to determine the mode of inheritance of matte skin, an abnormal root periderm characteristic in inbred lines of the Nantes type carrot. This characteristic was observed during a breeding program at the Ontario Agricultural College (1). Although no conclusive genetic information was obtained, certain anatomical and physiological aspects of the anomaly were ascertained.