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During forcing, the witloof chicory taproot produces an etiolated bud, the chicon. The axis of this organ often is brown as a consequence of a disorder associated with a localized Ca deficiency. The effect of the main anions (NO3 -, Cl-, SO4 2) in the nutrient solution on Ca (45Ca) absorption and translocation in the chicon was investigated. Although the amount of Ca that accumulated in the chicon was not affected by nutrient solution composition, Ca (45Ca) mobility was modified. The amount of radioactivity in the chicon increased slightly when the main anion in the solution was sulfate and decreased markedly when the main anion was chloride, compared to nitrate. Calculations of the specific radioactivity of Ca reaching the chicon and in root tissue suggest that, when slowed down, Ca transport consists of a homogeneous flow in all root tissues, whereas, in other cases, Ca moves along a preferential pathway, such as the xylem vessels. Modifying the anionic composition of the nutrient solution to avoid a localized Ca deficiency is discussed.

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Calcium (Ca) nutrition and the balance between Ca and other plant nutrients are key factors that affect fruit quality and storability. This is especially important for fleshy crops, such as apple, pear, tomato, pepper, and potato ( White and

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’ apple N and Ca concentrations ( Mills et al., 1996 ) but increased ‘Anjou’ pear fruit Ca concentrations ( Brun et al., 1985 ). It has, however, been generally concluded that deficit irrigation has limited effects on fruit mineral nutrition which, if

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as the high source thresholds per nutrient trait by Codex Alimentarius (1997) definitions: 4.2 mg/100 g Fe, 90 mg/100 g Mg, 300 mg/100 g Ca, and 4.5 mg/100 g Zn, by fresh weight basis. Previous studies have evaluated vegetable amaranth for nutrition

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and years with poor coloring conditions. Phostrade Ca (Pho Ca) is a concentrated liquid P solution containing calcium and nitrogen recommended for foliar application at the beginning of fruit formation and during fruit enlargement and maturation. P

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Abstract

Fruit of apple (Malus domestica Bork) stored in air for 3 to 4 months at 0°C before being placed in CA (delayed-CA) generally were of intermediate quality between apples stored in CA soon after harvest and those stored in air. Apples from CA had lower respiration rates, higher acidities, and were rated harder and juicier by taste panelists than apples stored in air. Four cultivars responded similarly to these storage conditions.

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Authors: , , and

Plant responses to drought stress involve multiple mechanisms at molecular, biochemical, physiological, and metabolic levels ( Bhargava and Sawant, 2013 ; Shanker et al., 2014 ; Todaka et al., 2015 ). Many small molecules, such as Ca and H 2 O 2

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Abstract

Seedlings of 5 strains of tomato (Lycopersicon spp.) were grown in low-Ca nutrient solutions in a greenhouse for 4 weeks in order to determine whether Ca-efficient and inefficient strains differed in concentrations of water-soluble Ca. Aqueous extracts from dried tissues of efficient strains were lower in percent of Ca and in electrical conductivity than were extracts from inefficient strains. Efficient strains may suffer less than inefficient strains from precipitation or displacement of Ca from functional sites in tissues by other ions.

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multiple GA 4+7 sprays may not be sufficient to offset this additional cost in some years or regions. Prohexadione-calcium (P-Ca) is a gibberellin biosynthesis inhibitor that is increasingly being used in apple production systems globally to reduce

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Abstract

A method was developed to determine the total Ca, Mg, and K content of apple (Malus domestica Borkh.) pulp based on an assay in the water-extractable fraction. Water-soluble and total levels of each of the three elements in the fruit correlated significantly (P < 0.001) at harvest. The method is accurate (cv = 4.1%, 4.1%, and 2.5% for Ca, Mg, and K, respectively) and time-saving. The total level of minerals determined by the method proposed correlated well (P < 0.001) with that obtained by acid digestion of freeze-dried apple pulp.

Open Access