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Environmental Influence on Specific Leaf Weight and Its Heritability in Sainfoin¹

Specific leaf weight (SLW, mg/cm²) of 24 space-planted clones of sainfoin (Onobrychis viciaefolia Scop.) and their solid-seeded progeny was estimated in 1970. Seven of these clones were selected for additional studies. SLW was estimated for these seven clones when grown in the greenhouse during the winter and again in a new space-planted nursery in the field in 1971. SLW of progeny of these seven clones was also determined when they were grown in space-planted rows in 1971. Heritability of SLW was determined by the parent-progeny regression method.

The SLW of the 24 space-planted clones ranged from 5.4 to 12.5. The range in SLW of solid-seeded progenies was 4.9 to 7.7 and the heritability estimate for SLW was very low (.O8). SLW of the seven selected clones was much lower in the greenhouse than in the field. The heritability estimate of SLW measured on space-planted clones and progenies was .54. However, the heritability estimate of SLW measured on solid-seeded progenies and space-planted clones was zero. This study indicated that SLW in sainfoin is greatly influenced by the environment. Large differences in SLW occurred in space-planted clones and progeny but not in solid seedings of progeny.

Key Words: Leaf thickness • Legumes

² Graduate assistant, Plant and Soil Science Department, Montant State University, Agronomist, Plant Science Research Division, Agricultural Research Service, USDA and Associate Professor, Plant and Soil Science Department, Montana State University, Bozeman, Montana.

Received for publication November 15, 1971.