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Boron deficiency is a common deficiency of the micronutrient boron in plants. It is the most widespread micronutrient deficiency around the world and causes large losses in crop production and crop quality. Boron deficiency affects vegetative and reproductive growth of plants, resulting in inhibition of cell expansion, death of meristem, and reduced fertility. Plants contain boron both in a water-soluble and insoluble form. In intact plants, the amount of water-soluble boron fluctuates with the amount of boron supplied, while insoluble boron does not. The appearance of boron deficiency coincides with the decrease of water-insoluble boron. It appears that the insoluble boron is the functional form while the soluble boron represents the surplus.〔(【引用サイトリンク】 Boron deficiency )〕 Boron is essential for the growth of higher plants. The primary function of the element is to provide structural integrity to the cell wall in plants. Other functions likely include the maintenance of the plasma membrane and other metabolic pathways. ==Symptoms== Symptoms include dying growing tips and bushy stunted growth, extreme cases may prevent fruit set. Crop-specific symptoms include; *''Apple''- interacting with calcium, may display as "water core", internal areas appearing frozen *''Beetroot''- rough, cankered patches on roots, internal brown rot. *''Cabbage''- distorted leaves, hollow areas in stems. *''Cauliflower''- poor development of curds, and brown patches. Stems, leafstalks and midribs roughened. *''Celery''- leaf stalks develop cracks on the upper surface, inner tissue is reddish brown. *''Celeriac''- causes brown heart rot *''Pears''- new shoots die back in spring, fruits develop hard brown flecks in the skin. *''Strawberries''- Stunted growth, foliage small, yellow and puckered at tips. Fruits are small and pale. *''Swede (rutabaga)'' and ''turnip''- brown or gray concentric rings develop inside the roots. *''Arecaceae'' (''Palm Tree'') - brown spots on fronds & lower productivity.references/ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boron deficiency (plant disorder)」の詳細全文を読む スポンサード リンク
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