Subjects: Biology >> Botany >> Applied botany submitted time 2023-09-20 Cooperative journals: 《广西植物》
Abstract： Saxifraga L. is rich in species diversity with about 440–500 species and broad distribution. The taxonomical issues of this genus have been continuously concerned by the botanists. Saxifraga has important ornamental and medicinal values. Some of European countries have made great efforts on the exploitation and utilization of its ornamental resources. China is one of the diversity centers of Saxifraga, but it has been lagged far behind Europe, USA and even Japan in exploitation and utilization on ornamental value of this genus. The world breeding work in Saxifraga started 150 years ago. By the end of 2022, the 1 692 names of cultivars had been on-line listed by The Saxifrage Society, but only one came from China. In this paper, the germplasm resources of Saxifraga, and progress on its classification and breeding were reviewed, and also the utilization of its ornamental resources was briefly introduced, which will provide an important reference for taxonomical research, breeding and horticultural application of this genus in China. The results were as follows: (1) Saxifraga is rich in germplasms, but many scientific issues remain in the evolutionary relationships of its subordinate systems, which require a systematic and in-depth investigation by integrating morphological and molecular biology methods. (2) The cultivars of this genus are mainly raised through cross-breeding and mutant selection, and the majority of cultivars produced from the UK, Czech Republic, Germany, and the Netherlands. (3) The breeding of Saxifraga started very late in China, with only few cultivars from one breeding method.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-05-21 Cooperative journals: 《广西植物》
Abstract： As a shade plant with high ornamental value, Saxifraga stolonifera is often used in landscape of courtyards and gardens. The light intensity may have an important impact on its growth performance, especially on leaf color, formation and coloration of leaf variegation, which subsequently affects its ornamental value. However, the related study has not been reported before. In order to explore the adaptability of different cultivars of S. stolonifera to light intensity and understand their light or shade tolerance, three internationally-registered cultivars raised in China were used as the experimental material, the effects of five light intensity treatments (100%, 85%, 60%, 40% and 15%) on plant growth and development and photosynthetic physiological indexes were investigated. The suitable indexes of light intensity for Saxifraga were screened by the principal component analysis, and the light tolerance of the cultivars was evaluated by membership function analysis. The results were as follows: (1) The number of stolons, number of blades, leaf length, leaf width, leaf area, specific leaf area, chlorophyll a, b and total chlorophyll contents increased with shading. (2) The fresh and dry weight above ground, stolon diameter, and the contents of carotenoid and flavonoids increased first and then decreased. (3) The initial fluorescence values and the contents of soluble sugar, soluble protein and malondialdehyde of the leaves decreased with shading. (4) By analysis of principal component and membership function, the significant differences were found in the adaptability of the three cultivars to light intensity, ‘Xue Wen’ > ‘Tianmu Enci’ > ‘Hei Kui’. In which, 40% light intensity is optimal for ‘Xue Wen’, and 15%-40% light intensity is optimal for ‘Tianmu Enci’ and ‘Hei Kui’. Therefore, in horticultural practice, the suitable light intensity should be considered according to the cultivars of Saxifraga.
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