Contour Trees and Small Seed Sets for Isosurface Generation

The present study of the winter annual Crepis tectorum examines the relationship between seed (achene) size and the extent to which seeds resist germination during the year of their production. I carried out two seed burial experiments, one at an outcrop site occupied by a small-seeded population, and another in an experimental garden with soil from the same field site, with seeds representing the local population and a segregating generation of a cross between two other populations. Using logistic regression with data corrected for seed viability, I found an association between small seed size and failure to germinate in the first autumn. The small seed size characterizing many outcrop populations may have evolved as a response to selection for delaying germination in a habitat subject to unpredictable droughts during the growth season. Keywords: Crepis tectorum, germination, seed bank, seed size.

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The BELT and phenoSEED platforms: shape and colour phenotyping of seed samples

10.1101/825695 ◽

2019 ◽

Author(s):

Keith Halcro ◽

Kaitlin McNabb ◽

Ashley Lockinger ◽

Didier Socquet-Juglard ◽

Kirstin E Bett ◽

...

Keyword(s):

Seed Coat ◽

Lens Culinaris ◽

Imaging System ◽

Test Case ◽

Analysis Software ◽

Qualitative Information ◽

Phenotypic Analysis ◽

Seed Analysis ◽

Small Seed ◽

Primary Test

AbstractBackgroundSeed analysis is currently a bottleneck in phenotypic analysis of seeds. Measurements are slow and imprecise with potential for bias to be introduced when gathered manually. New acquisition tools were requested to improve phenotyping efficacy with an emphasis on obtaining colour information.ResultsA portable imaging system (BELT) supported by image acquisition and analysis software (phenoSEED) was created for small-seed optical analysis. Lentil (Lens culinaris L.) phenotyping was used as the primary test case. Seeds were loaded into the system and all seeds in a sample were automatically and individually imaged to acquire top and side views as they passed through an imaging chamber. A Python analysis script applied a colour calibration and extracted quantifiable traits of seed colour, size and shape. Extraction of lentil seed coat patterning was implemented to further describe the seed coat. The use of this device was forecasted to eliminate operator biases, increase the rate of acquisition of traits, and capture qualitative information about traits that have been historically analyzed by eye.ConclusionsIncreased precision and higher rates of data acquisition compared to traditional techniques will help breeders to develop more productive cultivars. The system presented is available as an open-source project for academic and non-commercial use.

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Growth and Yields of Bell Pepper and Winter Squash Grown with Organic and Living Mulches

Journal of the American Society for Horticultural Science ◽

10.21273/jashs.119.6.1193 ◽

1994 ◽

Vol 119 (6) ◽

pp. 1193-1199 ◽

Cited By ~ 17

Author(s):

Nancy E. Roe ◽

Peter J. Stoffella ◽

Herbert H. Bryan

Keyword(s):

Cucurbita Pepo ◽

Phytophthora Capsici ◽

Bell Pepper ◽

Pepper Plant ◽

Arachis Glabrata ◽

Organic Mulch ◽

Small Seed ◽

Raised Bed ◽

Plant Stand ◽

Winter Squash

Increasing disposal problems with polyethylene (PL) mulch and greater availability of compost prompted an investigation into the effects of using compost as a mulch on horizontal raised bed surfaces with living mulches (LMs) on vertical surfaces. Wood chips (WC), sewage sludge-yard trimming (SY) compost, and municipal solid waste (MW) compost were applied at 224 t·ha-1 on bed surfaces. Sod strips of `Jade' (JD) or `Floratam' (FT) St. Augustinegrass (Stenotaphrum secundatum Kuntze) or perennial peanut (Arachis glabrata Benth.) (PP) or seeds of a small, seed-propagated forage peanut (Arachis sp.) (SP) were established on the vertical sides of the raised beds before transplanting bell pepper (Capsicum annuum L.) into the beds. Phytophthora capsici reduced pepper plant stand in PL-mulched plots compared with organic mulch (OM) and LM. Despite the stand reduction, total pepper yields were highest in PL plots and, in the OM plots, decreased in the order SY > MW > WC. Early fruit yields and yield per plant were highest from plants in PL plots followed by SY. Among LMs, plants in SP plots produced highest early yields and FT produced the lowest. Plants in PL plots produced the largest fruit. When the same plots were seeded with winter (butternut) squash (Cucurbita pepo L.), plant stands were higher in MW than WC and SY. Squash yields were similar between PL and OM plots.

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