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玉蜀黍,高粱和几种其它植物的最高同化效率为50～60毫克CO_2am~(-2)hr~(-1),并且CO_2的补偿浓度(r)接近于0。相反,一部分禾谷类(Small grains)和许多其它植物的最高同化效率为20～30毫克CO_2dm~(-2)hr~(-1),而且r值约为60PPm。将这些具有高的和低的r值的植物放在同一个密闭器内,便可使得器内的CO_2浓度降低,而不足以维持高r值植物的生存;而低r值植物在5～8天之后还能生存。这是从大量植物中筛选高同化率植株的迅速而简单的方法。
The highest assimilation efficiency for maize, sorghum and several other plants ranged from 50 to 60 mg CO_2am -2 hr -1, and the CO 2 compensation concentration (r) was close to zero. In contrast, the highest assimilation efficiencies for some of the grains and many other plants ranged from 20 to 30 mg CO 2 dm -2 hr -1, with an r value of about 60 ppm. By placing these plants with high and low r values in the same trap, the CO 2 concentration inside the trap can be reduced, not enough to maintain the survival of plants with high r. In contrast, plants with low r values range from 5 to 8 After days can survive. This is a quick and easy way to screen plants with high assimilation rates from a large number of plants.