Sodium Chloride Effects on Seed Germination, Growth, and Water Use of Lepidium alyssoides, L. draba, and L. latifolium: Traits of Resistance and Implications for Invasiveness on Saline Soils

Hooks, Triston; Picchioni, Geno A.; Schutte, Brian J.; Shukla, Manoj K.; Daniel, David L.

doi:10.1016/j.rama.2018.04.001

Cited by 5 publications

(2 citation statements)

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“…Both L. draba and L. appelianum are native to Eurasia and have high competitiveness and invasiveness in their native, expanded, and introduced ranges (Francis and Warwick 2008;Hinz et al 2012). Lepidium draba and L. appelianum occur on a variety of soil types, including saline soils where moisture is in at least moderate supply (Darbyshire 2003;Hooks et al 2018). They grow in regions with abundant irrigation (Francis and Warwick 2008), wet and dry grasslands, scrublands, and arid regions with alkaline soils (Mulligan 2002;Mulligan and Findlay 1974).…”

Section: Introductionmentioning

confidence: 99%

“…The reproductive biology of L. draba is, at least in part, responsible for its wide distribution, but very little is known about the underpinning mechanisms. What is known about it is only based on studying the germination and seedling growth of "isolated" seeds, that is, seeds manually extracted from their fruits (Hooks et al 2018; Rezvani and Zaefarian 2016;Rezaee et al 2018). However, a key feature of L. draba and L. appelianum is that they produce indehiscent fruits that do not open to release seeds (Mühlhausen et al 2013;Mummenhoff et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Pericarp-mediated chemical dormancy controls the fruit germination of the invasive hoary cress (Lepidium draba), but not of hairy whitetop (Lepidium appelianum)

et al. 2019

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This study provides a comparative analysis of the dormancy and germination mechanisms of the indehiscent fruits of hoary cress (Lepidium draba L.) and hairy whitetop (Lepidium appelianum Al-Shehbaz), two invasive weeds of the Brassicaceae. Germination assays comparing isolated seeds (manually removed from the fruits) and intact indehiscent fruits showed that the isolated seeds are nondormant and provided full germination for both species. In contrast to this, the species differed in the germination properties of their indehiscent fruits, in that L. appelianum fruits were nondormant, while the L. draba fruit coat (pericarp) conferred a coat-imposed dormancy. The pericarp of L. draba fresh fruit was water permeable, and neither mechanical scarification nor surface sterilization affected germination, supporting the concept that pericarp-mediated dormancy was not due to water impermeability or mechanical constraint. Washing of L. draba fruits with water, afterripening (dry storage), and treatment with gibberellin (GA) stimulated the germination of this species, all of which are indicative of physiological dormancy. Analyses of endogenous abscisic acid (ABA) and GA levels combined with treatment experiments with wash water from fresh and afterripened L. draba pericarps and with ABA dose–response quantification of germination revealed that ABA is a key component of a pericarp-mediated chemical dormancy in this species. Consistent with this, pericarp ABA levels decreased during afterripening and upon fruit washing, and isolated fresh or afterripened seeds did not differ in their ABA sensitivities. The possible roles of the ABA-mediated pericarp dormancy for the germination ecophysiology and weed management of these species are discussed.

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