玉米种子萌发过程中Na^＋、K^＋和Ca^2＋含量变化与耐盐性的关系  

Relationship between Changes of Na^+, K^+, and Ca^(2+) Contents during Seed Germination and Salt Tolerance in Maize

作　　者：商学芳[1] 董树亭[1] 郑世英[2] 王丽燕[2] 

机构地区：[1]山东农业大学作物生物学重点实验室,山东泰安271018 [2]德州学院,山东德州253023

出　　处：《作物学报》2008年第2期333-336,共4页Acta Agronomica Sinica

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB101700);国家科技攻关计划项目(2004BA520A08);国家自然科学基金项目(30471025);农业部行业标准专项(NYHZX07-003);国家科技支撑计划(2006QAD02A09);山东省农业良种工程(2006790号)项目

摘　　要：玉米耐盐品种登海9号和盐敏感品种浚单18在含0、50、100、150和200mmolL-1 NaCl的营养液中萌发生长,采用等离子质谱分别测定其萌动种子种皮、胚、胚乳和幼苗根、根颈、叶中Na+、K+、Ca2+的含量。结果表明,随着培养液中NaCl浓度的增加,玉米体内Na+含量逐渐升高,在幼苗中表现地下部(根和根颈)显著高于地上部(叶);在萌动种子中,胚中Na+积累量显著高于种皮和胚乳。根系积累Na+能力较强,胚拒Na+能力较弱,种皮具有一定的Na+累积能力。随NaCl浓度的增加,K+和Ca2+含量逐渐降低,尤其是Ca2+含量急剧减少,达38.4%～55.9%(登海9号)和65.6%～78.2%(浚单18)。玉米根、根颈、种皮的Na+积累能力、叶的拒Na+能力和幼苗选择吸收Ca2+的能力可能与品种耐盐性有关。Maize （Zea mays L.） seeds of a salt tolerant cultivar Denghai 9 and a salt sensitive cultivar Jundan 18 were germinated and grown in 1/4 and 1/2 Hoagland solutions with 0, 50, 100, 150, and 200 mmol L^-1 NaCl, respectively. The contents of Na^＋, K^＋, and Ca^2＋ in testa, embryo, endosperm, roots, root crown, and leaf were measured by ICP Mass. The Na^＋ content increased accordantly with the NaCl concentration in culture solution. In young seedlings, Na^＋ content in root and root crown was higher than that in leaf; in germinating seeds, it was significantly higher in embryo than in testa and endosperm. The capacity of Na^＋ accumulation in roots was strong, while the capacity of Na^＋ rejection in embryo was weak. The testa could also accumulate some Na^＋. The K^＋ and Ca^2＋ contents in germinating seeds and young seedlings of maize decreased obviously under NaCl stress, and the Ca^2＋ content showed changes in a large scale, which was 38.4%-55.9% in Denghai 9 and 65.6%-78.2% in Jundan 18. The capacities of Na^＋ accumulation and rejection as well as the Ca^2＋ selective absorption might be related to salt-tolerance of maize cultivars

关 键 词：玉米 盐胁迫 Na^+含量 K^+含量 CA^2+含量 种子萌发 

分 类 号：S513[农业科学—作物学]