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Meadowfoam Seed Yield Response to Temperature during Flower Development

Dep. of Crop and Soil Sci., Oregon State Univ., Corvallis, OR 97331-3002

^* Corresponding author.

Variation in meadowfoam (Limnanthes alba Hartw. ex Benth. subsp. alba cv. Mermaid) seed yield has resulted in unpredictable economic returns and limited the area of production of this new oilseed crop. A controlled-environment experiment was conducted to evaluate the effects of a 7-d period of 16/10, 24/10 and 32/10 °C day/night temperature regimes imposed during floral bud development or peak bloom stages on seed set and seed yield. Thirty hand-pollinated flowers were used to determine mean seed set per flower, weight per seed, and seed weight per plant. Increasing temperature from 16/10 to 32/10 °C during bud development did not affect seeds per flower, increased (P = 0.04) weight per seed, and increased (P = 0.04) seed weight per plant. Increasing temperature from 16/10 to 32/10 °C at peak bloom decreased (P = 0.02) seeds per flower, did not affect weight per seed, and decreased (P = 0.03) seed weight per plant. It was concluded that higher day temperatures (32 °C) during bud development, and lower day temperatures (16 °C) during flowering and early seed formation, would favor seed production in Mermaid meadowfoam.

Received for publication May 6, 1991.

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