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作物学报 ›› 1986, Vol. 12 ›› Issue (02): 95-100.

• 研究论文 • 上一篇    下一篇

硝酸还原酶的研究——Ⅶ.棉花不同品种的硝酸还原酶活力

李文才;林振武;汤玉玮

  

  1. 安徽省棉花所; 中国科学院上海植物生理研究所

  • 收稿日期:1985-01-09 修回日期:1986-02-12 出版日期:1986-05-12 网络出版日期:1986-05-12

STUDIES ON NITRATE REDUCTASE——Ⅶ.NITRATE REDUCTASE ACTIVITY IN DIFFERENT COTTON CULTIVARS

Li Wencai,Lin Zhenwu,Tang Yuwei   

  1. Anhui Institute of Cotton;Shanghai Institute of Plant Physiology; Academia Sinica

  • Received:1985-01-09 Revised:1986-02-12 Published:1986-05-12 Published online:1986-05-12

摘要:

本文对棉花叶片NR活力的体外分析方法作了两点改进:1)组织匀浆改加提取缓冲液于水浴中,为先在干冰中磨成粉状后再加提取缓冲液溶解;2)匀浆后增加离心沉淀步骤。结果使硝酸还原酶在匀浆中得到充分的保护,完全排除了棉花体内色素对比色的干扰,进一步减少了酚类及其他物质对酶的抑制作用,因此 NR 活力大大提高,约为改进前方法的15倍。用改进的方法对8个陆地棉品种和4个栽培棉种(每种用1个品种作代表),进行 NR 活力的分析、观察,发现陆地棉品种间 NR 活力有明显的差异,同一品种在不同生育期中也有不同,酶活力的这一变化与品种的生长势和对外界氮肥的吸收利用能力有正相关关系。在4个供试栽培棉种中,海岛棉的 NR 活力最高,陆地棉最低,亚洲棉和非洲棉居中。结果还表明4个栽培种的叶绿素含量、光合强度和可溶性糖等生理指标与 NR 活力一致的趋势。

Abstract:

The method of in vitro analysis of NR assay was modified as follows:1)The tissue was first homogenated into powder form in solid CO2 anddissolved in extract buffer.2)The homogenate was then centrifugated at4000 rpm/min for 15 min to precipitate the NR fraction.This methodhas the advantage of protecting NR from inhibitory compounds like phenolsand others,it also makes a lower background by discarding the suppersolution containing pigment after centrifugation.As a result,the NRactivity extracted by this meth...

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