Shade avoidance and reproductive strategies of an early successional species Penthorum chinense in relation to shade treatments. (24th January 2020)

• Record Type: Journal Article
• Authors: Yang, Y. Y.; Kim, J. G.
• Editors: Elzenga, J. T. M.
• Is Part Of: Plant biology. Volume 22:Number 3(2020)
• Page Start: 494
• Page End: 499
• Publication Date: 2020-01-24
• Subjects: Gap spaces -- light treatment -- realized niche -- stem elongation -- trade‐offs; Botany -- Periodicals; Plants -- genetics -- Periodicals; Plants -- growth & development -- Periodicals; Plant Proteins -- Periodicals; Gene Expression Regulation, Plant -- Periodicals; Botanique -- Périodiques; 580
• DOI: 10.1111/plb.13086
• Languages: English
• ISSNs: 1435-8603

Abstract

Abstract: Shade avoidance is expected to be favoured under moderate light. However, in previous studies, shade avoidance was highest in the deepest shade, despite the fact that the plants incur the costs of shade avoidance without the benefits of being exposed to increased light. We performed shading experiments under different light intensities to understand: (i) how shade avoidance traits of Penthorum chinense could peak in moderate light, and (ii) if there was a trade‐off between plant height and allocation of seeds along the light gradients. Penthorum chinense increased shade avoidance traits such as height per total dry mass as the amount of light decreased. Side stem number per total dry mass of P. chinense decreased as shade became deeper, from full light to low light. Regressions on seed mass fraction and height were significant with a linear model ( y = −0.0006 x + 0.1338). There were more resources allocated to seeds under low light than under moderate light. Penthorum chinense increased shade avoidance traits with the decrease in light amount, as found in previously studied species. There was a trade‐off between height and production of more seeds. The reproductive strategy of P. chinense was to increase seed mass fraction under low light more than under moderate light. This species might be able to expand established populations by both rhizomes and seeds under low light environments. Abstract : Penthorum chinense does not show the highest shade avoidance under moderate light as species previously studied, but P. chinense has a reproductive strategy of increasing seed mass fraction more under low light than under moderate light.