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The effects of four consecutive daily sprays of gibberellicacid (GA3) on the growth of leaves of young tomato plants cv.Potentate were studied. Total leaf weight and area were increasedby GA3. The percentage changes were larger in the younger leavesthan in the older but the absolute increases of the middlleleaves accounted for most of the total response. Chlorophyllcontent, both total and per unit weight, was reduced by GA inthe older leaves and increased in the younger; on an area basisit was reduced in all but the youngest leaves. Palisade cell length and palisade cell number per unit sectionlength were reduced by GA3 in the oldest leaves and increasedin the youngest. There were larger intercellular spaces in bothmesophyll layers and a larger transectional area of the mid-ribsof the oldest and two youngest leaves in GA3 plants. The surfaceareas of epidermal cells were also increased by GA3 treatment.Leaf fresh weight per unit area was only a true index of laminathickness in the two oldest leaves. 相似文献
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