Biology & Agriculture Division, Bhabha Atomic Research Centre, Bombay, India.
Theor Appl Genet. 1979 Jan;54(1):41-7. doi: 10.1007/BF00265707.
Production values (PVs), defined as the weight of the end product/weight of the substrate required for carbon skeletons and energy production, were calculated for plant fatty acids. The PVs varied from 0.361 to 0.300 with linolenic acid having the lowest value. In general, the PVs of unsaturated fatty acids were lower than those of saturated fatty acids of similar chain lengths. Using this basic information, PVs of (A) oils from different oilseed crops, based on their standard fatty acid composition and (B) seed biomass with specified oil content and fatty acid composition were calculated. 1/PV gives the glucose required for the biosynthesis of 1 g end product and thus an estimate of the photosynthate requirement for the desired breeding goal can be estimated. Such calculations show that increasing oil percentage in seeds has a maximum energy cost when the increase in oil is associated with a decrease in the amount of carbohydrates where there is no change in protein concentration. Reduction of erucic acid content in the rapeseed oil did not alter its PV. It is inferred that there are no serious bioenergetic constraints in altering the fatty acid composition.
生产值（PV）定义为终产物的重量/生成碳骨架和能量所需的基质的重量，用于植物脂肪酸。其 PV 值在 0.361 到 0.300 之间变化，其中亚麻酸的 PV 值最低。一般来说，不饱和脂肪酸的 PV 值低于相似链长的饱和脂肪酸。利用这一基本信息，可以根据标准脂肪酸组成计算（A）不同油籽作物油的 PV 值，以及（B）具有指定油含量和脂肪酸组成的种子生物量。1/PV 给出了合成 1 g 终产物所需的葡萄糖量，因此可以估算出实现所需育种目标所需的光合产物量。这样的计算表明，当油的增加伴随着碳水化合物量的减少而没有蛋白质浓度变化时，种子中油的百分比增加具有最大的能量成本。降低油菜籽油中的芥酸含量不会改变其 PV 值。可以推断，在改变脂肪酸组成方面没有严重的生物能量限制。
