Growth analysis in common milkweed (Asclepias syriaca)

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Abstract
Effects of 24 or 35 °C under 8- (SD) or 18-h (LD) photoperiods on early growth of common milkweed (Asclepias syriaca L.) were studied in growth chambers. The higher temperature stimulated growth under SD but repressed growth under LD. The lower temperature encouraged root growth under SD whereas the 35 °C treatment promoted basal shoot production under both photoperiods. Effects of 24 and 28 °C on early growth and 32 and 36 °C on regrowth from basal shoots were studied under 16-h photoperiods at photosynthetic photon flux densities (PPFDs) of 110 or 310 μmol∙s−1∙m−2. Dry matter distribution patterns to leaves, stems, and roots at the two PPFDs were similar except that during regrowth under the higher PPFD, distributions to leaves and stems increased markedly and stem growth was apparently favoured over leaf growth. During early growth under the higher PPFD, plants were taller, had a greater leaf area, and produced more dry matter than under the lower PPFD. Further, under the higher PPFD, specific leaf area was lower and during regrowth, leaves were smaller and thicker and the plants produced more dry matter. Leaf areas under the two PPFDs were similar during much of the regrowth period.

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