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  • Author or Editor: R. J. Henny x
  • Journal of the American Society for Horticultural Science x
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Abstract

Dieffenbachia maculata (Lodd.) G. Don ‘Perfection’ inflorescences pollinated at high (100%) relative humidity (RH) revealed excellent in vivo pollen germination and produced seed. Those pollinated at low (40-50%) RH showed almost no pollen germination and did not set seed. Anthers dehisced pollen better at high RH than at low.

Open Access

Abstract

Aphelandra squarrosa Nees. plants grown under 250 μmol s−lm−2 photosynthetically active radiation (PAR) were transferred to 265, 737, and 1070 μmol s−1m−2. Stomatal density and number of palisade layers of newly expanded leaves decreased linearly after 2 months, while number of countable chloroplasts per palisade cell increased linearly as light intensity decreased. Number of countable chloroplasts per palisade cell decreased and palisade layers increased in mature leaves transferred to higher PAR levels. Stomatal density and guard cell length in mature leaves did not change. There were nonlinear responses to PAR levels in number of marginal collenchyma cells, leaf thickness, and palisade cell length of immature leaves. Chloroplasts in mature and immature leaves were less discrete and more tightly appressed to anticlinal palisade cell walls as PAR levels increased.

Open Access