植物生态学报 ›› 2007, Vol. 31 ›› Issue (4): 720-728.DOI: 10.17521/cjpe.2007.0092

• 论文 • 上一篇    下一篇

灌浆期不同水分处理对玉米籽粒蛋白质及其组分和相关酶活性的影响

张智猛1(), 戴良香1, 胡昌浩2, 董树亭2, 王空军2, 宁堂原2   

  1. 1 山东省花生研究所,山东青岛 266100
    2 山东农业大学农学院,山东泰安 271018
  • 收稿日期:2005-08-22 接受日期:2006-09-30 出版日期:2007-08-22 发布日期:2007-07-30
  • 作者简介:E-mail: zmengzhang@sohu.com
  • 基金资助:
    山东省良种产业化资助项目(30025)

EFFECT OF WATER ON PROTEIN, PROTEIN COMPOSITION AND RELATED ENZYME ACTIVITY IN DIFFERENT TYPES OF MAIZE

ZHANG Zhi-Meng1(), DAI Liang-Xiang1, HU Chang-Hao2, DONG Shu-Ting2, WANG Kong-Jun2, NING Tang-Yuan2   

  1. 1Shandong Peanut Research Institute, Qingdao, Shandong 266100, China
    2Department of Agronomy, Shandong Agricultural University, Tai'an, Shandong 271018, China
  • Received:2005-08-22 Accepted:2006-09-30 Online:2007-08-22 Published:2007-07-30

摘要:

蛋白质作为氮素代谢的终极产物,与玉米(Zea mays)籽粒品质呈正相关关系,其生物合成主要在硝酸还原酶(NRase)、谷氨酰胺合成酶(GS)、谷氨酸脱氢酶(GDH)等一系列酶催化下完成,受制于品种自身遗传特性及环境因素,栽培管理措施和生态环境条件对玉米品质具有十分重要的影响。关于土壤水分供应状况对玉米籽粒主要品质成分的分布、积累动态和相关酶活性的影响的研究尚少见报道。以两种不同类型玉米:普通玉米‘掖单22’和高油玉米‘高油115’为研究对象,采用防雨棚池栽试验。水分处理以开花期为界线,设置3种水分处理,花后不浇水(W0)、花后浇1水(灌浆期,W1)、花后浇3水(灌浆期、乳熟期、蜡熟期,W2)。结果表明:两种类型玉米籽粒蛋白质及其组分含量的积累动态基本一致,且不受土壤水分供应状况的影响。玉米籽粒蛋白质及清蛋白、谷蛋白含量,均为‘高油115’较高,球蛋白含量为‘掖单22’较高,醇溶蛋白两类型玉米含量相近。在不同水分供应条件下,两种类型玉米叶片中NRase、GS酶活性和籽粒中GS、GDH酶活性的变化动态一致,NRase酶活性自灌浆初期至成熟期一直下降,GS、GDH酶活性呈单峰曲线,在授粉后20~40 d达到高峰,充足的水分供应有利于酶的活性维持较高水平;玉米叶片中NRase酶活性,‘掖单22’高于‘高油115’,叶片GS和籽粒GDH酶活性显著低于‘高油115’。研究表明:用玉米叶片中NRase和GS活性的高低表征籽粒蛋白质含量的高低不确切,土壤水分条件与不同类型玉米穗位叶和籽粒中GS 和GDH活性关系密切。

关键词: 水分, 玉米, 品种类型, 蛋白质,

Abstract:

Aims The biosynthesis of maize protein, which is positively correlated to maize grain quality, is controlled by nitrate reductase (NRase), glutamine synthetase (GS), and glutamate dehydrogenase (GDH), which are affected by genetics and environment. Therefore, cultivation methods and environment affect grain quality in maize; however, there are few reports of the effects of soil water on maize grain quality and corresponding enzyme activities.
Methods The experiment was carried out in pool culture within a rain-proof shelter using normal maize (Yedan 22) and high oil maize (Gaoyou 115). There were three water treatments: no irrigation after anthesis, irrigation once after anthesis (at grain filling period) and irrigation three times after anthesis (at grain filling period, milky period and wax period).
Important findings Grain protein was higher in Gaoyou115 than Yedan22, and its component contents increased with increasing water supply. With different water supply, the activities of NRase, GS in leaves and GS, GDH in grains exhibited the same trends in the two types of maize. The activity of NRase decreased, and the activities of GS and GDH had unimodal curves, peaking 20 to 40 days after pollination. The activities of these enzymes increased with increased water supply. However, the activity of NRase in leaves of Yedan22 was higher than in Gaoyou115, while the activities of GS in leaves and GDH in grains were reversed, resulting in lower protein content in grains of Yedan22 than in Gaoyou115. The NRase and GS activities in maize leaves did not match grain protein content. Soil water condition was closely related with the activities of GS and GDH in ear leaves and grains of different types of maize.

Key words: water, maize, variety type, protein, enzyme