Invasive Species Compendium

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Abstract

Yield stability of peach germplasm differing in dormancy and blooming season in the Mexican subtropics.

Abstract

From 1993 to 1996, information about the behaviour of a wide range of peach accessions during dormancy and bud-break was collected over a 4-year period in the most important peach-growing region in the subtropical highlands of central Mexico where winter frosts are a common constraint to peach production. From 1998 to 2002, observations were made on 33 peach accessions (local varieties, introduced varieties, and hybrids) out of a total of 65 that had been planted at an elevation of 2100 m in the state of Querétaro, central Mexico, in 1997. Differences in fruit set among the genotypes were associated with the sensitivity to enter rest (SER), the time of blooming, the duration of blooming, bud density (BD), and flower density (FD). The latter were generally related. Bud to flower ratios and yields were low for materials that were blooming very late. Varieties with stable yields such as San Juan, Fred, 17-1, and 24-1, were medium to late blooming. It was concluded that SER, BD, FD, and the BD: FD ratio should be used as selection criteria for improving the stability of peach production in the subtropical highlands of Mexico. From abstract Elsevier Science Journal. KEYWORDS: TROPAG | Prunus persica | fruit trees | Prunus persica | germplasm | dormancy | flowering | temperature resistance | cold | plant breeding | Latin America | Mexico | Queretaro de Arteaga.