【摘要】 利用盆栽试验,研究了施硅(K2SiO3)对黄瓜叶片组织结构和保水能力的影响。结果表明:硅显著增加了黄瓜叶片的厚度(3.03%～4.08%)、表皮层厚度(3.53%～7.23%)、栅栏组织厚度(5.69%～11.52%)及叶片组织紧密度(2.59%～7.11%),降低了叶片比表面积(4.76%～7.14%),显著降低了叶片组织疏松度(2.26%～2.45%),减少了水分蒸腾(25.8%～27.6%),显著提高了叶片含水量(3.25%～3.62%);硅通过改变植株叶片结构而降低蒸腾、提高保水能力,这是硅增强黄瓜抗旱性的重要原因。更多还原

【Abstract】 A pot experiment was conducted to study the effects of silicon(K2SiO3)supply on the leaf structure and water-holding capacity of cucumber plant.The results showed that silicon supply increased the leaf thickness by 3.03%-4.08%,epidermis thickness by 3.53%-7.23%,palisade tissue thickness by 5.69%-11.52%,and cell tense ratio by 2.59%-7.11%,and decreased the specific leaf surface area by 4.76%-7.14% and sponge ratio by 2.26%-2.45%.As a result,the leaf transpiration of cucumber plant decreased by 25.8%-27.6%,and the leaf water content increased by 3.25%-3.62%.By the alteration of cucumber leaf structure,silicon decreased the leaf transpiration while increased the leaf water-holding capacity,and thus,enhanced the drought resistance of cucumber plant.更多还原