Abstract
Commercial production of Maackia amurensis Rupr. & Maxim. (Amur maackia) is very limited despite the ornamental and nitrogen (N2)-fixing potential of this tree species. The goal of this on-going project is foster production efforts by selecting genotypes based on growth rate, morphology, stress resistance, and efficiency of N2 fixation. To establish a collection of plants with diverse genetic backgrounds, we requested half-sib lots of seed from arboreta, public gardens, and zoos in 1991. Mean seed mass of the 38 lots that were obtained ranged from 35 to 99 mg. Germination ranged from 67 to 100% and was 78% for the oldest lot, which was harvested at least 66 years ago. Over 2500 seedlings representing the 38 lots were grown in a greenhouse during the 1992 season. The mean epicotyl length and number of compound leaves varied among seedlings in the different lots. Results to date indicate that selecting genotypes based on growth rate and morphological features will be possible.
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