Abstract
The oil content, seed yield parameters and fatty acid composition of high- and low-erucic acid Brassica (napus and hirta) seed oils were studied under three different controlled-temperature regimes: low, 12/17 °C; medium, 17/22 °C; and high, 22/27 °C. No fruit set was obtained beyond 27 °C. Under low temperatures, seeds of high-erucic acid Brassica napus var. Norin and Brassica hirta (Sinapis alba) var. Bet Dagan developed higher erucic and lower oleic acid levels, while seeds of low-erucic, high-oleic acid B. napus var. Westar developed a lower level of oleic acid and a higher level of linolenic acid. The reverse was found at high temperatures. In all three cultivars, oil content and seed yield parameters decreased significantly with an increase in temperature. In addition, higher temperatures accelerated the time of seed maturity. The rate of synthesis of erucic acid during seed development was found to be affected by the temperature regime.
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