大量元素鉀ppt課件-展示頁
2025-05-12 22:05本頁面
【正文】 稻 籽粒 莖桿 莖稈 棉花 籽粒 馬鈴薯 塊莖 莖桿 葉片 玉米 籽粒 糖用甜菜 根 莖桿 塊莖 谷子 籽粒 煙草 葉片 莖稈 莖 Potassium is characterized by high mobility in plants at all levels (cells, tissues, longdistance transport) , which is easily transported from roots to shoots. There is a stable K concentration in cytoplasm, which is about 100~200 mM, the other K stores at the vacuole. 干物質(zhì)含鉀量（ %） 細(xì)胞質(zhì) 液泡 0 1 2 3 4 5 K+ 濃 度 300 200 100 0 Unlike N and P, K exists in plant as an ion(K+), and does not form stable plexes. Nutrition function of K+ involves : neutralizing the soluble and insoluble anion。 Stabling pH between 7 and 8。 Enzyme activation。 ※ Improving chloroplast structure。 ※ Improving carbohydrate transport. Osmoregulation K+ is the dominant osmotic substances. Cell extension is the consequence of the accumulation in the cells of K+. Stomatal Movement In most species K+ has the major responsibility for turgor changes in the guard cells during stomata movement. An increase in the K+ concentration in the guard cells results in the uptake of water from the adjacent cells and a corresponding increase in turgor in the guard cells and thus the stomata opening. Improving anic acid metabolism Improving the tolerance of plants to stress Drought。 Cold。 Salt。 Enhancing vitamins in vegetables。 Improving mercial quality。 ?下部老葉葉緣先發(fā)黃，然后變褐、焦枯； ?有些作物葉片呈青銅色，向下卷曲，葉表葉肉突起，葉脈下陷； ?根系生長不良，色澤黃褐； ?種子、果實(shí)小，產(chǎn)量低，品質(zhì)差； ?早衰。 yellowing, followed by tissue death, progressing inward along the margins of older leaves. 煙草： 葉片小、葉尖端黃化，葉緣間 失綠發(fā)黃，有褐色壞死斑
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