摘要
盆栽试验条件下,菠菜体内的硝态氮含量及硝酸还原酶(NR)活性因品种和部位而异。硝态氮含量以短缩茎中最高,叶和叶柄中次之,根中最低,且根/冠比越大的品种,其整体植株中的硝态氮含量越低;根尤其是侧根NR活性较高;叶肉和叶柄中硝态氮含量均与根中以内、外源硝酸盐为底物的NR活性呈一定的负相关。
The mechanism of nitrate accumulation in six spinach （Spinacia oleacea L.） varieties under low nitrogen level was studied in a pot experiment. The results showed that, NO3^--N contents and nitrate reductase （NR） activity had obvious diversity in different spinach varieties and different organs of the same plant. The NO3^--N contents in stem were the highest, followed by petioles, then mesophylls, and were the lowest in roots. When the ratio of root to shoot was higher, the NO3^--N contents in plants were lower. NR activity was higher in root especially in lateral root. The NO3^-N contents in mesophyll and petiole were negative correlated with the in vitro-NR activity and in vivo-NR activity in roots.
出处
《植物生理学通讯》
CSCD
北大核心
2006年第2期217-220,共4页
Plant Physiology Communications
基金
国家自然科学基金(30370843
40201028
39970429)
农业部"948"重大研究项目(2003-Z53)
西北农林科技大学拔尖人才项目
关键词
菠菜
根
硝酸还酶活性
叶柄
硝态氮
spinach （Spinacia oleacea L.）
root
nitrate reductase activity
petiole
NO3^--N
