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Seasonal dynamics of the accumulation, distribution and redistribution of dry matter and mineral nutrients in a weedy species of gladiolus (gladiolus caryophyllaceus)

Hocking, P.J. (1993) Seasonal dynamics of the accumulation, distribution and redistribution of dry matter and mineral nutrients in a weedy species of gladiolus (gladiolus caryophyllaceus). Annals of Botany, 71 (6). pp. 495-509.

Link to Published Version: http://dx.doi.org/10.1006/anbo.1993.1066
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Abstract

The seasonal dynamics of the accumulation, distribution and redistribution of dry matter and 12 mineral nutrients by a weedy species of gladiolus (Gladiolus caryophyllaceus) were studied at Perth, Western Australia, where it has colonized the nutrient-poor sandy soils. Parent corms sprouted in autumn, and the plants had completed their growth cycle by early summer. The mature replacement corm had 3 5-25% of the plant’s P, Ca, Na, Zn and Cu, 5-15% of its K, N, Cl, Mg, S and dry matter, and < 5% of its Fe and Mn. Seeds had 26% of the plant’s dry matter, 60% of its N and P, 21-33% of its S, Mg, Cu and K, 5-20% of its Fe, Mn and Zn, and < 5% of its Ca and Na. The mature vegetative shoot had 47% of the plant’s dry matter and over 40% of each nutrient, except for N, P and Cu. Phosphorus, K and N were redistributed from the parent corm with over 85% efficiency, S, Mg, Zn and Cu with 60-70% efficiency, but there was < 10% redistribution of Ca, Na, Cl, Fe and Mn. The efficiency of redistribution from the leafy shoot was over 70% for N and P, 29-52% for K, Mg and Cu, 16-20% for S, Zn and Cl, but negligible for Ca, Na, Fe and Mn. Redistribution from the shoot could have provided the replacement corm and seeds with 53-98% of their Cu, Mg, N, P and K, and 29-38% of their S, Zn and dry matter. Seeds contained over 60% of each nutrient in a capsule, except for Ca, Na and Fe. Redistribution from the capsule walls could have provided 13-19% of the P, Cu and Zn, and 3-7% of the N, K, Mg and dry matter accumulated by seeds. Each plant produced an average of 520 seeds. Removal of flowers and buds at first anthesis resulted in a larger replacement corm containing a greater quantity of most nutrients, indicating competition between the replacement corm and seeds for nutrients. Redistribution from parent to replacement cormlets in the absence of shoot and root development was high, with over 50% of the dry matter and each nutrient, except for Ca, being transferred. Concentrations of nutrients were low in all organs of G. caryophyllaceus, especially the replacement corm. It was concluded that the effective redistribution of key nutrients, such as N and P, to reproductive structures and tolerance of low internal concentrations of nutrients contribute to the capacity of G. caryophyllaceus to colonize and persist on infertile soils.

Publication Type: Journal Article
Murdoch Affiliation: School of Environmental and Life Sciences
Publisher: Oxford University Press
Copyright: © 1993 Annals of Botany Company.
URI: http://researchrepository.murdoch.edu.au/id/eprint/34026
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