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This article in CS

  1. Vol. 23 No. 5, p. 953-955
     
    Received: Oct 13, 1983


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doi:10.2135/cropsci1983.0011183X002300050033x

Seedling Characteristics and Rates of Seed Reserve Utilization of Wilman Lovegrass and Kleingrass1

  1. C. R. Tischler and
  2. P. W. Voigt2

Abstract

Abstract

The objective of this study was to determine why wilman lovegrass (Eragrostis superba Peyr.) has a greater shoot mass (P < 0.01) at 14 days postemergence than does kleingrass (Panicum coloratum L.). Caryopses of both species contain the same amount of starch, but wilman lovegrass caryopses contain more protein and P (P < 0.01). Wilman lovegrass had a greater shoot mass than kleingrass at 3 and 7 days postemergence. At 3 days after germination, wilman lovegrass caryopses contained less starch (P < 0.05) than kleingrass. At 6 days after planting, starch reserves were depleted in both species and protein and P contents of the caryopses residues were similar in both species, thus indicating the wilman lovegrass caryopses supplied more protein (or amino acids) and P to the growing shoot than did corresponding kleingrass caryopses. Respiration rates of caryopses of both grasses were similar after 1 day of imbibition, but respiration rates of 2- and 3-day-old wilman lovegrass seedlings were higher (P < 0.05) than rates of corresponding kleingrass seedlings. Wilman lovegrass had a greater nitrate reductase activity than kleingrass at 3 days after emergence (P < 0.05), although nitrite reductase activity and chlorophyll content were similar in both species. Selection for greater seedling vigor in kleingrass may result in genotypes with a) a faster rate of starch mobilization and utilization, and b) a higher starch, protein, and P content per caryopsis.

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