Some botanical information and asexual propagation of (Xyloselinum leonidii Pimenov & Kljuykov) from cuttings

Abstract

Xyloselinum leonidii Pimenov & Kljuykov, a new and endemic species for the flora of Vietnam belongs to Apiaceae family, described by Pimenov & Kljuykov in 2006: perennial woody shrub, 0.5-1.8 m tall; leaves densely crowded at the stem apices, 2-3-pin-natisect, basal segments petiolulate, with petiolules 1-2 cm long, alternate, tripinnate; upper branches, bearing umbels, 10 - 11 cm in diameter; fruits glabrous, 6.5-6.7 mm long, 2.8-3.0 mm wide,
elongato-lanceolate in outline. The species has restricted distribution under forest canopy, on limestone mountains at an altitude over 1,200 m (a.s.l),  grows in rocky niches with soil, humus. Now, over-exploition for commercial
purposes so numbers of species decreased and distribution narrowed, their genetic resources have been seriously threatened. The results of cutting Xyloselinum leonidii showed that the highest germination and rooting rates
(6.7%) in combination with IBA concentration 1500 ppm after 90 days in the substrates 100% clean sand. Both germination and rooting rates occurrent in combination with IBA concentration 1000 ppm and 1500 ppm after 180 days in the substrates 2 (GT2: 50% rice husk ash + 30% soil + 20% cattle compost) and 3 (GT3: 50% rice husk + 30% soil + 20% cattle compost) but in substrates 3 (GT3): the highest root number of Xyloselinum leonidii cutting (8.9%), root height (5.5 cm) and medium root number 5.6 root/cutting. The results of cutting types (softwood, semi - hardwood, and hardwood) Xyloselinum leonidii showed that: the highest germination and rooting rates of semi - hardwood (10%) and shoot height (12.3%) in combination with IBA
concentration 1500 ppm in the substrates 3 (GT3: 50% rice husk + 30% soil + 20% cattle compost, while no rooted cuttings were found in the types softwood.