《Table 3–Influence of N application rate on faba bean biomass in early growth stages.》

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《"Accumulation of L-DOPA in various organs of faba bean and influence of drought, nitrogen stress, and processing methods on L-DOPA yield"》

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Values are means of three replications and two experiments.*and**，significant at the 0.05 and 0.01 probability levels.L，linear；Q，quadratic；GS，growth stage.

Under all irrigation treatments，change in biomass of faba bean showed a quadratic response with a typical sigmoid trend（Table 1）.The amount of biomass production decreased significantly as drought stress intensified.At eight-leaf stage，faba bean plants grown under moderate and severe drought stress produced 27%and 42%less biomass than well-watered plants.Reduction in biomass of plants under drought stress condition is not surprising，given that growth of plant organs requires maximum turgor pressure.Such pressure is not available when irrigation water is limited，resulting in reduced plant height，leaf size，and stem diameter[40，41].Other than cell expansion，photosynthesis is also considered to be one of the earliest physiological functions impaired when plants experience drought stress，owing mainly to stomatal closure[15，24].