(42) Effects of Photoselective Shadecloths on Potted Dracaena and Anthurium Plants

Abstract

<jats:p>Photoselective shadecloths that manipulate light quality may enable nursery growers to achieve desired plant growth. This ability to manage plant habit could give growers an additional nonchemical tool to improve potted plant quality. The objective of this study was to determine growth and flowering responses of potted <jats:italic>Dracaena</jats:italic> and <jats:italic>Anthurium</jats:italic> plants to four shadecloths. <jats:italic>Dracaena deremensis</jats:italic> `Janet Craig' and <jats:italic>Dracaena marginata</jats:italic> `Colorama' cane top-cuttings were placed in 70% black cinder: 30% peat moss media. <jats:italic>Anthurium</jats:italic> `Lola' liners were transplanted into 100% black cinder medium. Plants were grown in a greenhouse under 70% shadecloths: black, gray, red, and blue. Four months after planting, <jats:italic>Dracaena</jats:italic> `Janet Craig' had more new leaves under red shadecloth (10.4) compared to other shadecloths (8.9–9.3). Leaf area was less with red shadecloth (340 cm<jats:sup>2</jats:sup>) than other treatments (380-388 cm<jats:sup>2</jats:sup>). Plants under the red shadecloth had the lowest grower evaluation scores (5.4; 1 = poor, 10 = excellent) than those under other shadecloths (7.2–8.2), but all plants were considered marketable. <jats:italic>Dracaena</jats:italic> `Colorama' plants under red shadecloth had the greater plant height increase (20.1 cm) than those under other shadecloths (10.1–13.2 cm). Red shadecloth resulted in more new leaves (26.2) compared to other treatments (18.0–21.4). <jats:italic>Anthurium</jats:italic> `Lola' flower height 9 months after transplanting was less under red shadecloth (23.0 cm) than under black (33.0 cm). The number of flowers/pot was greater under red shadecloth (3.17) compared to those under other shadecloths (0.50–1.33). Flower size was greater (35.2 cm<jats:sup>2</jats:sup>) under red shadecloth than under black (20.0 cm<jats:sup>2</jats:sup>). Photoselective shadecloths may be used to nonchemically manipulate plant growth and improve the quality of potted <jats:italic>Dracaena</jats:italic> and <jats:italic>Anthurium</jats:italic> plants.</jats:p>

Variáveis Fisiológicas De Antúrio Cultivado Sob Diferentes Malhas De Sombreamento

“…Em relação à coloração, tem sido utilizada malha predominantemente preta. No entanto, estudos mostraram respostas diversas de plantas ornamentais às alterações na qualidade da luz (Meirelles et al, 2007;Melo & Alvarenga, 2009), havendo inclusive indicações de efeitos benéficos no cultivo de antúrio em vaso (Kobayashi et al, 2006). Assim sendo, pelo exposto, objetivou-se neste trabalho avaliar o desenvolvimento de Anthurium andraeanum cv.…”

Genetic Basis for Productivity in Anthurium andraeanum Hort.

“…Maintaining high productivity is essential for the commercial viability of the anthurium cut flower industry. Much of the work in the past (Campbell, 2006;Kobayashi et al, 2006;Nakasone and Kamemoto, 1962) has focused mainly on improving the agronomy toward improving productivity. This is the first study investigating the genetic variation and heritability of productivity in Anthurium with the view to improving productivity through breeding.…”