Abstract
SUMMARYSeven vegetable species grown in controlled environments were given similar daily amounts of visible radiation (500 J cm‐2) during three different photoperiod treatments. Plants were given (A) 12 h of visible irradiance (115 W m‐2) from fluorescent and tungsten lamps, (B) 16 h of the same light at 88 W m‐2 or (C) Treatment A extended to 16 h with 4 h of low‐intensity incandescent light (3 W m˜2) from tungsten lamps only. All seven species grew faster when daylength was extended with light of photosynthetic intensity (B), probably through increased net assimilation rates, and leaf area of these plants increased in proportion to change in plant dry weight. Daylength extension with a mixture of red and far‐red light (C) induced photomorphogenic changes in specific leaf area in all species examined and increased leaf area and plant dry weight of lettuce, celery, beetroot and spinach beet but not of three members of the Cruciferae (radish, cabbage and oilseed rape).
Published Version
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