Eliminating zygotic seedlings in 'Turpentine' mango rootstock populations by visual roguing.
Schnell R. J., Knight R. J., Harkins D. M., Zill G.
Author Affiliation: USDA-ARS, National Clonal Germplasm Repository, 1360l Old Cutler Road, Miami, FL 33158, USA.
HortScience 29 : 319-320
Abstract : The ability to eliminate zygotic seedlings from the polyembryonic mango (Mangifera indica) rootstock Turpentine by visual roguing was investigated in 4-week-old seedlings in 1991. Four selected populations, (A) randomly selected plants, (B) plants selected as off-types, (C) seedlings of Turpentine phenotype and (D) seeds where a single seedling emerged, were examined using electrophoretic analysis of five enzyme systems. Significant differences (?² = 39.63, P 0.001) were found among the four categories, with 28% of the random, 66% of the off-type, 10% of the true-to-type and 54% of the monoembryonic seedlings being zygotic. These data indicated that visual selection for trueness-to-type and roguing for off-types is useful in reducing the frequency of zygotic seedlings among Turpentine rootstock plants.