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- Author or Editor: Homer T. Erickson x
Abstract
Lima beans, Phaseolus lunatus L., are native to the Western Hemisphere. In precolonial times they were cultivated from coastal Peru, their present English name being derived from the capital of that country, to the southern United States. Specimens have been found in archeological sites dating back more than 5,000 years. The prevailing evolutionary theory states that their center of origin is Central America, possibly Guatemala, and from there they spread north and south along the continental land mass and throughout the Caribbean Islands.
Mean seed production in tetraploid × diploid crosses of Salpiglossis sinuata R et P. was similar to that in diploid × diploid crosses, but germination of the resultant triploid seeds was low (8%). Parental line selection resulted in some germination improvement. Triploid hybrids from these crosses were vigorous, with floral characteristics resembling tetraploids. The fertility indices of self-pollinations of triploids and pollinations by diploid and tetraploid plants were <1, 22, and 6, respectively, compared with 176 for diploid × diploid crosses. Thus, the self-pollinated triploids were virtually sterile.
Abstract
A germplasm release representing 8 selections of Salpiglossis sinuata L. (velvet flower), all free of the cleistogamous character which inhibits corolla development, is being made by the Purdue University Agricultural Experiment Station. Five of the selections are diploid (2n = 44) and 3 are tetraploid (2n = 88).
Abstract
The effects of the components of Lam's 1977 potato nutrient medium on adventitious shoot formation were systematically evaluated. A low concentration (0.03 mg/liter) of naphthaleneacetic acid (NAA) stimulated shoot initiation and increased survival of tuber discs of potato (Solanum tuberosum L.). Indoleacetic acid (IAA), however, did not affect shoot initiation in the concentration range from 0 to 10 mg/liter. Both 6-benzyl-amino purine (BA) at 0.3, 1.0, and 3.0 mg/liter and N6-(4-hydroxy-3-methyl-but-2-enylamino)-purine (zeatin) at 0.3 and 1.0 mg/liter stimulated adventitious shoot formation while N6-furfurylaminopurine (kinetin) had no effect. Sucrose was essential for shoot formation with a concentration of 30 g/liter being optimal. Although not essential, i-inositol enhanced the initiation of adventitious shoots at concentrations of 60 and 100 mg/liter. Casein hydrolysate and additional inorganic phosphate had no promotive effect on shoot formation and adenine sulfate was inhibitory at all concentrations examined.