`Barbara Bush' Bluebonnet (Lupinus texensis Hook.)

Lupinus campestris Schltdl. & Cham. grows in shallow fields and disturbed areas of Central Mexico. It has potential to improve soil fertility and as fodder. Seeds of L. campestris show dormancy, and the technology needed to increase its potential use requires information about conditions favouring seed germination. The aim of this study was to evaluate the seed germination response of L. campestris under controlled (laboratory) and natural field conditions. Under laboratory conditions, 2 yr old seeds had a maximum germination percentage (50%) when they were scarified with sulphuric acid for 90 min prior to sowing and when laboratory light (0.5 µmol m-2 s-1) was maintained during the diurnal period. Without scarification, only about 3% of the seeds germinated. Light in laboratory resulted in an increased seed germination as compared to darkness condition. In the field experiment 1 yr old seeds were used testing the following treatments: (a) seed scarification (seeds scarified by 30 min immersion in sulphuric acid vs. not scarified), (b) presence or absence of plants of L. campestris in plots before field experiments, and (c) sowing depth (on soil surface and at 3 cm deep). The scarified seeds showed a germination percentage range between 50 and 64%, whereas non-scarified seeds had 9 to 16% germination. The seeds sowed in plots with or without plants of L. campestris (before the experiment) germinated similarly, indicating no evidence of self-inhibition of germination. Three conclusions come out: (1) Scarification treatment with sulphuric acid effectively breaks dormancy in L. campestris seeds; (2) Direct sowing of scarified seeds (on the soil surface or at 3 cm depth) resulted in a range of 50-64% of germination under field conditions; and (3) no evidence was obtained for self-inhibition or a positive interaction between preceding vegetation and seed germination of L. campestris.

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“…(Anthony, 1991), L. regalis (Persson, 1993), L. texensis Hook. (Parsons et al, 1994), and L. hispanicus Boiss. & Reut.…”

Section: Introductionmentioning

confidence: 99%

Effect of Scarification, Self-Inhibition, and Sowing Depth on Seed Germination of Lupinus campestris

Nava

González

Barra

et al. 2010

Chilean J. Agric. Res.

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“…Color variants exist in native populations but are quite rare. 'Abbott Pink' was the first cultivar to be developed (Parsons and Davis, 1993) followed by 'Barbara Bush' lavender (Parsons et al, 1994) and 'Texas Maroon' (Mackay et al, 2000). 'Lady Bird Johnson Royal Blue' was developed by recurrently selecting for flower color and is the fourth seed-propagated cultivar to be released from this project.…”

mentioning

confidence: 99%

‘Lady Bird Johnson Royal Blue’ Bluebonnet (Lupinus texensis Hook.)

Stein¹,

Parsons²,

Lineberger³

2011

horts

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Homogenization of Populations in the Wildflower, Texas Bluebonnet (Lupinus texensis)

Turner

Huang

Cronk

et al. 2017

Journal of Heredity

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Wildflower seeds are routinely spread along highways and thoroughfares throughout North America as part of federal beautification policy, but the genetic effect of the introduction of these cultivated populations on wild populations of the same species is unknown. Interbreeding may occur between these seeded and wild populations, resulting in several possible outcomes. Here we sample 187 individuals in 12 matched pairs of neighboring wild and seeded populations of the Texas bluebonnet (Lupinus texensis), a species popular in commercially available wildflower seed mixes used by both the Texas Department of Transportation and the public. We use genotyping by sequencing to identify 11741 genome-wide single nucleotide polymorphisms, as well as a smaller number of SNPs from the chloroplast genome, to analyze population structure and genetic diversity within and between the populations. We find a striking lack of population structure both between wild and seeded populations and amongst wild populations. STRUCTURE analyses indicate that all populations are apparently panmictic. This pattern may be explained by extensive swamping of wild populations by seeded germplasm and increased dispersal of semi-domesticated seed across this species' core native range by humans. We discuss the possible negative and positive ramifications of homogenization on the evolutionary future of this popular wildflower species.

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`Barbara Bush' Bluebonnet (Lupinus texensis Hook.)

Abstract: Additional index words. bedding plant, flower color, lupine, ornamentals breeding one month after anthesis, are densely pubescent, and contain four to seven seeds each. Weight per 100 seeds is ≈3.5 g. Seeds are light brown, occasionally speckled with black.

Cited by 4 publications

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Effect of Scarification, Self-Inhibition, and Sowing Depth on Seed Germination of Lupinus campestris

Effect of Scarification, Self-Inhibition, and Sowing Depth on Seed Germination of Lupinus campestris

‘Lady Bird Johnson Royal Blue’ Bluebonnet (Lupinus texensis Hook.)

Homogenization of Populations in the Wildflower, Texas Bluebonnet (Lupinus texensis)

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