Phenotypic Plasticity, Biomass Allocation, and Biochemical Analysis of Cordyline Seedlings in Response to Oligo-Chitosan
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ORIGINAL PAPER
Phenotypic Plasticity, Biomass Allocation, and Biochemical Analysis of Cordyline Seedlings in Response to Oligo-Chitosan Foliar Spray Rasha S. El-Serafy 1 Received: 15 October 2019 / Accepted: 11 March 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract Cordyline is one of the most important indoor pot plants and has a high request in the global market. As a bio-stimulant, chitosan could be used to enhance the plant growth and productivity, despite the variation in growth analysis and phenotypic plasticity of several plant species in response to chitosan supplement. Cordyline seedlings were foliar sprayed with five concentrations of oligo-chitosan (0, 25, 50, 75, and 100 mg L−1) for 4 months. Oligo-chitosan induced rapid growth of cordyline seedlings, in terms of larger specific leaf weight (SLW) and higher relative growth rate (RGRA), as well as improving the efficiency of plant photosynthesis (high net assimilation rate (NAR) or low specific leaf area (SLA)). Root growth rate (RGRR) has also increased by 89.13% with the application of 50 mg L−1 oligo-chitosan, which reflected on higher plant biomass (BM) in comparison to the control. Consequently, root biomass (RM) showed the greatest plasticity index (PPI) that enhanced growth, productivity, and quality as well as the marketability of cordyline seedlings. Foliar spray of 50 mg L−1 oligo-chitosan improved plant growth, root development, and plasticity index, resulted in increased quality and marketability of cordyline seedlings. Keywords Cordyline terminalis . Chitosan . Growth . Phenols
1 Introduction The production of ornamental plants requires careful management practices starting at early nursery stages to improve plant growth and development, in addition to produce high quality and marketable plants. Nursery practices are usually standardized for individual plant species for producing high-quality seedlings (Davey 1994). Cordyline terminalis (L.) Kunth, Agavaceae family is one of the most important indoor pot plants that is highly demanded in global market. Known with its very slow growth rate (DeMason and Wilson 1985), cordyline is an evergreen tropical shrub that reaches up to 3 m height. It can be used in sunny indoor spots, as accent in dark outdoor corners, or to add a special interest in floral compositions. Cordyline leaves Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42729-020-00229-7) contains supplementary material, which is available to authorized users. * Rasha S. El-Serafy [email protected] 1
Horticulture Department, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt
have the ability to absorb volatile organic compounds from the surrounding air (Zhou et al. 2011). Cordyline could be propagated asexually using tip and stem cuttings, or by dividing the mother plant. Many reports have revealed the positive impact of biostimulants on ornamental production from propagation and planting (El-Serafy 2015; El-Serafy and El-Sheshtawy 2017; Parađiković e
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