Fruit growth and development of 'Ideal' and 'Western' pecans
1990
Herrera, E.A.
Pecan [Carya illinoensis (Wangenh.) K. Koch] fruit development was evaluated over three growing seasons (1981-83) to determine the seasonal growth patterns in the cultivars Ideal and Western. Gross morphological stages were examined weekly in fruit dissected in cross and longitudinal sections. Free-nucleate endosperm was first observed in mid-July when fruit had grown to 50% of their final length, occurring at 67 days after stigma receptivity (DASR) for 'Ideal' and 76 DASR for 'Western'. Maximum content of free-nucleate endosperm occurred 100 DASR in 'Ideal' and 109 DASR in 'Western' fruit. Ovary wall lignification was completed 119 DASR in 'Ideal' and 132 DASR in 'Western'. At this time, nut enlargement was complete. Cotyledon thickening required 36 and 43 days for 'Ideal' and 'Western', respectively. The time from stigma receptivity to completion of cotyledon thickening in mid-October was 13 days longer for 'Western' than for 'Ideal'. Because of a cool spring in 1983, all stages required a longer time in 1983 than in the previous 2 years. Most aspects of fruit development were similar between 'Ideal' and 'Western' over the 3-year study.
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