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  • Author or Editor: Harold M. Pellett x
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Abstract

The members of the genus Aesculus, known as buckeyes and horsechestnuts, includes trees commonly planted in parks, arboreta, college campuses, and home landscapes (2). Aesculus ‘Autumn Splendor’ is a selection that combines leaf scorch resistance, cold hardiness in USDA zone 4a, handsome flowers, and brilliant fall color to make it a particularly desirable medium-sized landscape tree.

Open Access

Abstract

The relationship between in vivo pollen germination and vital staining was tested for 7 genotypes of deciduous azalea (Rhododendron sp.) differing in fertility. Fluorescein diacetate, 3-amino-9-ethylcarbazole (AEC), and 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyl tetrazolium bromide (MTT) all showed significant correlations between staining and germination. AEC produced the highest significant correlation (r = 0.96). AEC and MTT were the most suitable vital stains for azalea pollen.

Open Access

Abstract

Water uptake and movement in Thuja occidentalis pyramidalis Hort, during periods when soil was frozen were examined by use of deuterium as a tracer. Plants in containers were buried to the soil line and electric heating cables were placed below the pots. Deuterated water was added through access tubes when the soil was warmed above 0°C. The amount of deuterium tracer in the foliage was analysed with a gas chromatograph-mass spectrometer (GC-MS). Using this technique, it was found that no water moved from the roots to the foliage when the soil was frozen. When the soil temperature was raised above 0°C, tissue deuterium content increased 7 to 10 fold.

Open Access