Effect of Shading Mature Leaves of Alfalfa and Sainfoin Plants on Specific Leaf Weight of Leaves Formed in Sunlight1

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Abstract
Light intensity within a canopy may affect the specific leaf weight (SLW, mg/cm2) of new leaves formed. We studied the effect of shading mature and fully expanded leaves of alfalfa (Medicago sativa L.) and sainfoin (Onobrychis viciaefolia Scop.) on SLW of new leaves formed in the sun. Shading of mature leaves of alfalfa and sainfoin plants decreased SLW of new leaves formed. SLW values of alfalfa leaves formed in the sun on plants with old leaves shaded were intermediate between those formed on plants grown under 82% shade or under full sunlight. Alfalfa clones differed significantly in SLW and their order of rank was the same over all treatments. The significance of light intensity within a canopy upon SLW of new leaves formed at the top of the canopy is discussed.

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