Autotoxicity Against Germination and Seedling Emergence in Cistus ladanifer L

Abstract

Autotoxic species are those which adversely affect their own seeds' germination and/or seedling development. Cistus ladanifer L (labdanum or jara) has been shown to have a pattern of allelopathic behaviour against the herbs that share its habitat. The present work studied whether an autotoxic effect also exists. The aqueous solution obtained from washing jara leaves was found by itself to inhibit germination and cotyledon emergence of the species' seeds. When these same trials were carried out in soils, autotoxicity was observed only from leaves and soils collected in winter. This was so both in soils collected away from the influence of the jaral to which was added the greatest concentration of aqueous extract prepared from the leaves, and in soils collected within the jaral, except that in the latter group of soils germination was inhibited with or without the addition of C. ladanifer extracts. This autotoxic behaviour could be involved in the species' own population control, and would explain the scant self-regeneration within established C. ladanifer stands.

Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

“…Autotoxicity is an intraspecific type of allelopathy, occurring when a plant species releases chemical substances that inhibit or delay the germination and growth of the same plant species (Alias et al 2003;Hegab & Ghareib 2009;Gomaa & AbdElgawad 2012). The autotoxicity of S. oleraceus might have implications for the biocontrol of S. oleraceus itself.…”

Effect of Intercropping of Angelica sinensis with Garlic on its Growth and Rhizosphere Microflora

“…Soil sickness may be attributed to autotoxicity, soil microflora imbalance and changes in soil physiochemical properties (Young, 1984;Yu and Matsui, 1994). Previous studies report that build-up of plant pathogens is one of the major causes in soil sickness in Cistus ladanifer (Hassan et al, 1989), peach (Benizri et al, 2005), cucumber (Yao et al, 2006), Rehmannia glutinosa (Chen et al, 2007), Liriope (Zhao et al, 2010), while autotoxicity has been reported to be one of the major causes in soil sickness in cucurbit crops (Yu et al, 2000), alfalfa (Segiun et al, 2002), Cistus ladanifer (Alías et al, 2006), cucumber (Yao et al, 2006) and wheat (Wu et al, 2007). In many cases, soil microorganism played either direct or indirect role in yield reduction (Manici et al, 2003;Hu et al, 2006).…”

Effect of larch (Larix gmelini Rupr.) root exudates on Manchurian walnut (Juglans mandshurica Maxim.) growth and soil juglone in a mixed-species plantation

“…The autoinhibition and replant problems in natural forests and managed tree plantations can result in a decrease of seedling growth or delayed germination, limiting offspring (Alias et al 2006;Fernandez et al 2008;Kong et al 2008a). The data generated in this study clearly showed that the Manchurian walnut seedlings had difficulty surviving in their own plantation and that their growth was inhibited by their own soil and root exudates.…”