Relationship between seed mass and young-seedling growth and morphology among nine Bluebunch Wheatgrass populations

Ray-Mukherjee, Jayanti and Jones, Thomas A. and Monaco, Thomas A. and Adler, Peter B. (2019) Relationship between seed mass and young-seedling growth and morphology among nine Bluebunch Wheatgrass populations. Rangeland Ecology & Management, 72 (2). pp. 283-291. ISSN 15507424

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Abstract

To better match plant materials to ecological sites for the purpose of rangeland seedling establishment, we examined the relationship between seed size and growth and morphological traits in young seedlings of bluebunch wheatgrass (BBWG) (Pseudoroegneria spicata [Pursh.] Á. Löve), a perennial Triticeae bunchgrass native to the Intermountain West. Traits examined included onset of germination, seedling biomass traits, and seedling surface-area traits. We grew seeds of nine BBWG populations that varied for seed size and were produced in a common environment under 2 contrasting d/n temperature regimes (20/15°C; 10/5°C). Lighter-seeded populations germinated and initiated shoots earlier. Heavier-seeded populations displayed high levels of biomass-related traits (e.g., shoot and root biomass and shoot length), while lighter-seeded populations displayed high levels of surface area − related traits (e.g., specific leaf area and specific root length [SRL]). Correlations between seed size and young-seedling traits were mostly similar under the two temperature regimes. However, root length − related traits showed more positive correlations with seed size under the low-temperature regime, which is more similar to actual field-emergence conditions during early spring. P-24, a light-seeded population, originated from the most arid site and exhibited the highest SRL at low temperature, while T-17t, a heavy-seeded population, originated from the most mesic site and exhibited moderate SRL. Three populations used for rangeland revegetation, “Whitmar,” “Goldar,” and Anatone Germplasm, all exhibited low seed mass and high SRL. However, only Anatone displayed high root-to-shoot length ratio under both temperature regimes, perhaps explaining its wide and successful use in rangeland seedings.

Item Type:	Article
Authors:	Ray-Mukherjee, Jayanti and Jones, Thomas A. and Monaco, Thomas A. and Adler, Peter B.
Document Language:	Language English
Subjects:	Natural Sciences > Life sciences; biology > Physiology & related subjects > Reproduction, development, growth Natural Sciences > Life sciences; biology > Ecology Natural Sciences > Plants (Botany)
Divisions:	Azim Premji University - Bengaluru > School of Arts and Sciences
Full Text Status:	Public
URI:	http://publications.azimpremjiuniversity.edu.in/id/eprint/7228
Publisher URL:	https://doi.org/10.1016/j.rama.2018.11.006

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