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[Seed germination characteristics of Gentiana rigescens]
Abstract
To investigate the influences of temperature, lightness, storage method, storage time, and gibberellin on seed germination of Gentiana rigescens.
The germination rates of G. rigescens in different treatments were observed.
The most suitable temperature for the seed germination was 25 degrees C, at which the germination rate was 76.33%. The effect of lightness on the seeds was significantly; the germination rate of the seed was very low. Under the natural condition, the best storage method was dry storage (within 6 months), which could promote the after-ripening of the seed. 100-1 000 mg x L(-1) gibberellic acid could significantly reduce the seed germination time, and 500 mg x L(-1) gibberellic acid increased the germination rate of the seed to 95.00%.
... Since 80% germination was registered within 98 ± 1.4 days in GA treatment, as against 58 ± 0.5 days in 3 acid treatment, dormancy may be both mechanical and physiological. GA has been established as an effective 3 dormancy breaking growth regulator in many plant species including maize (Rood et al, 1990), in Macaw palm (Oliveira et al, 2013), in Gentiana rigescens seeds (Yang et al, 2011), in five species of Cacti (Rojas-Arechiga et al, 2011) and in Penstemon digitalis (De Mello et al, 2009). Mechanical dormancy in palms is due to restriction of embryo protrusion during germination by operculum of the seeds as reported in Elaeis guineensis (Myint et al, 2010), in Pritchardia remota (Perez et al, 2008) and in Macaw palm (Reberio et al, 2011). ...
Arenga wightii Griffith, an endemic palm, of Western Ghats and south and central Sahyadris having multiple uses is currently under threat due to habitat loss and over exploitation. Since seeds are the major propagules of this palm, seed study was carried out with a view to conserve this highly promising tree, in both ex-situ and in- situ conditions. The study included seed viability, germination, desiccation and dormancy breaking tests. The results of the study suggest desiccation, GA3/ acid treatment enhance germination, and dormancy observed is of both physiological and mechanical. The cost efficient means of germination induction is desiccation which could aid the farmers and common people in cultivating the species at large extent enabling reintroduction of the species.
The effect of gibberellic acid (GA3) in overcoming the potential allelopathy of ten plant species (Alnus nepalensis, Amygdalus persica var. nectarina, Camellia sinensis, Chaenomeles sinensis, Eucalyptus robusta, Juglans sigillata,
Prunus salicina, Punica granatum, Zanthoxylum bungeanum, and Zea mays) on seed germination of Gentiana rigescens, a medicinal plant, was examined. It was observed that GA3 had significant effects on overcoming the inhibitions of some of these plants.
With GA3 pretreatment, seed germination of G. rigescens was increased from 10.0 to 62% and 2.5 to 50.5% in the leaf extracts of Camellia sinensis and Chaenomeles sinensis, respectively and from 37.0 to 60.0%, 25.5 to 61.0%, 10.0 to 59.0%, 15.5 to 59.0%, and
23.5 to 59.5% in the root extracts of Alnus nepalensis, Camellia sinensis, Chaenomeles sinensis, Eucalyptus robusta, and Prunus salicina, respectively. The plumule length of G. rigescens with GA3 pretreatment in aqueous root extracts of
Chaenomeles sinensis was significantly longer than that for the control. The results suggest GA3 pretreatment would be effective for promoting germination of Gentiana rigescens seeds in a Gentiana rigescens-Camellia sinensis (or Chaenomeles sinensis)
agroforestry system.
Allelopathic effects of 4-tree species [Camellia sinensis (L.) O. Ktze, Eucalyptus robusta Smith, Chaenomeles sinensis (Thouin) Koehne, Alnus nepalensis D. Don] were studied on Chinese medicinal plant, Gentiana rigescens Franch. ex Hemsl.. The leaf or root aqueous extracts of all tree species reduced the germination, plumule and radicle growth of G. rigescens, but the effects were variable. The highest seed germination rate was with leaf extracts (10.0%) of Camellia sinensis. Contrarily the seeds did not germinate in leaf extracts of Eucalyptus robusta and Alnus nepalensis. The longest plumule length (3.37 mm) was in leaf extracts of Camellia sinensis. Hence G. rigescens may be grown as intercrop in tea (Camellia sinensis) plantation.
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