Mineral Composition of Apple Fruits. Relationships Between and Within Peel, Cortex and Whole Fruit Samples

Abstract

(Martin et al . 1969) , (vi) plugs of cortical quality and incidence ofstorage disorders, a tissue cut from transverse iquuto.ial rlic"t diversity ofsample types has been analyzed. (Ferguson et

Mineral contents of Ethiopian red and green apple fruits: A comparison with WHO/FAO standards

“…Several studies have been reported on the mineral contents of apple fruits in different parts of the world. Webster (1981) has studied the mineral composition of apple fruits and relationships between and within peel, cortex and whole fruit samples. Leis et al (2003) have reported the mineral content of apple fruits and leaves.…”

EFFECTS OF PHOSPHATE SPRAYS ON McINTOSH APPLE FRUIT AND LEAF COMPOSITION, FLESH FIRMNESS AND SUSCEPTIBILITY TO LOW-TEMPERATURE DISORDERS

“…Plant Sci. 66:617-626 (July 1986) (Smock 1971) and CA storage temperatures of 2.2-3 .3"C are recommended to avoid this disorder (Blanpied 1971 (Lidster 1982 (Sharples 1980 Samples of 32-48 apples per plot (eight apples per tree) were collected on 20 Sept. in both years and, after storage in air at 0'C for 4 mo, were blended for analysis of whole fruit less seeds and stem as previously described (Webster 1981) (Table 7). Apples of the 1982 crop were free of disorders when removed from 3"C storase and remained free of disorders after 7 d ai 20"C ( (Johnson and Yogaratnam 1978) and could conceivably mask a decrease in P-related breakdown by increasing a Ca-related, but visually similar, form of breakdown.…”

Seasonal Trends of Calcium, Magnesium, and Potassium Fractions in Apple Leaf and Fruit Tissues1

“…About 90% of the Mg and K concentrations in fruit were physiologically active. Physiologically active forms of Ca, Mg, and K followed changes in total concentrations very closely, so that analyses of physiologically active fractions provide no increased accuracy for predicting physi ological disorders.Various extractants have been used to fractionate Ca forms from apple leaf (1 ,5 , 12) and fruit (3,5,8,14,16) tissues. Water probably extracts Ca associated with water-soluble com pounds such as organic acids, chlorides, and nitrates, while N aN 03 extracts exchangeable Ca adsorbed on proteins and pec tins.…”

“…Water probably extracts Ca associated with water-soluble com pounds such as organic acids, chlorides, and nitrates, while N aN 03 extracts exchangeable Ca adsorbed on proteins and pec tins. Acetic acid was thought to extract Ca phosphates and car bonates, and HC1 to extract Ca oxalate (7).Several investigators (6,11,13,14,16,18) have sought to predict the development of Ca disorders based on total nutrient concentration of leaf and fruit tissues. However, total Ca may not be the best indication of the physiological and nutritional status of the plant (5), since fruit contains a relatively high level of metabolically inactive Ca which is associated with exchange sites and is essential for the movement of active Ca fractions to utilization sites (2).…”

“…Various extractants have been used to fractionate Ca forms from apple leaf (1 ,5 , 12) and fruit (3,5,8,14,16) tissues. Water probably extracts Ca associated with water-soluble com pounds such as organic acids, chlorides, and nitrates, while N aN 03 extracts exchangeable Ca adsorbed on proteins and pec tins.…”