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Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus

Awty-Carroll, D, Hauck, B, Clifton-Brown, J and Robson, P (2020) Allelopathic and intraspecific growth competition effects establishment of direct sown Miscanthus. GCB Bioenergy, 12 (6). pp. 396-409. ISSN 1757-1693

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Open Access URL: http://dx.doi.org/10.1111/gcbb.12680 (published)


High yielding perennial crops are being developed as a sustainable feedstock for renewable energy and bioproducts. Miscanthus is a leading biomass crop, but most plantations comprise a sterile hybrid Miscanthus × giganteus that is clonally propagated. To develop new varieties across large areas, rhizome cloning is inefficient, time consuming and expensive. Alternative approaches use seed, and in temperate regions, this has been successfully applied by raising seedlings as plug plants in glasshouses before transfer to the field. Direct sowing has yet to be proven commercially viable because poor germination has resulted in inconsistent stand establishment. Oversowing using seed clusters is a common approach to improve the establishment of crops and it was hypothesized that such an approach will improve uniformity of density in early Miscanthus stands and thereby improve yield. Sowing multiple seeds creates potential for new interactions, and we identified at least two inhibitory mechanisms related to seed numbers. Germinating seed produced allelopathic effects on nearby seed thereby inhibiting plant growth. The inhibitory effect of Miscanthus seed on germination percentages was related to seed number within clusters. An extract from germinating Miscanthus seed inhibited the germination of Miscanthus seed. The extract was analysed by HPLC, which identified a complex mixture including several known allelopathic compounds including proanthocyanidins and vanillic acid. There was also evidence of root competition in soil in a controlled environment experiment. When the experiment on competition was replicated at field scale, the establishment rates were much lower and there was evidence of shoot competition. We conclude that the numbers of seed required to ensure an acceptable level of establishment in the field may be economically impractical until other agronomic techniques are included either to reduce the inhibitory effects of higher seed numbers or to reduce oversowing rates.

Item Type: Article
Uncontrolled Keywords: Miscanthus; Miscanthus sinensis; agronomy; allelochemical; allelopathic; direct sowing; establishment; oversowing; seed biology; seed germination; 1001 Agricultural Biotechnology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Biological & Environmental Sciences (from Sep 19)
Publisher: Wiley
SWORD Depositor: A Symplectic
Date Deposited: 10 Jan 2023 14:11
Last Modified: 10 Jan 2023 14:11
DOI or ID number: 10.1111/gcbb.12680
URI: https://researchonline.ljmu.ac.uk/id/eprint/18579
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