Effects of NO (3) (-) -N on the growth and salinity tolerance of Tamarix laxa Willd

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Effects of NO (3) (-) -N on the growth and salinity tolerance of Tamarix laxa Willd
	Ding ; Xiaodong ; Tian ; Changyan ; Zhang ; Shirong ; Song ; Jie ; Fusuo ; Mi ; Guohua ; Feng ; Gu
刊名	PLANT AND SOIL
	2010
卷号	331 期号:40545 页码:57-67
关键词	OSMOTIC ADJUSTMENT GLYCINE BETAINE NITROGEN UPTAKE NITRATE UPTAKE SALT-STRESS PLANTS ACCUMULATION SEEDLINGS NACL PROLINE
ISSN号	0032-079X
通讯作者	Feng, G, China Agr Univ, Coll Resource & Environm Sci, MOA, Key Lab Plant Nutr,Key Lab Plant Soil Interact,MO, Beijing 100193, Peoples R China
中文摘要	The influence of NO (3) (-) -N on growth and osmotic adjustment was studied in Tamarix laxa Willd., a halophyte with salt glands on its twigs. Seedlings of T. laxa Willd. were exposed to 1 mM (control) or 300 mM NaCl, with 0.05, 1 or 10 mM NO (3) (-) -N for 24 days. The relative growth rate of seedlings at 300 mM NaCl was lower than that of control plants at all NO (3) (-) -N levels, but the concentrations of organic N and total N in the twigs did not differ between the two NaCl treatments. Increasing NO (3) (-) supply under 300 mM NaCl improved the growth of T. laxa, indicating that NO (3) (-) played positive roles in improving salt resistance of the plant. The twigs of T. laxa Willd. accumulated mainly inorganic ions, especially Na+ and Cl-, to lower osmotic potential (Is): the contributions of Na+ and Cl- to Is were estimated at 31% and 27% respectively, at the highest levels of supply of both NaCl and NO (3) (-) -N. The estimated contribution of NO (3) (-) -N to Is was as high as 20% in the twigs in these conditions, indicating that NO (3) (-) was also involved in osmotic adjustment in the twigs. Furthermore, increases in tissue NO (3) (-) were accompanied by decreases in tissue Cl- and proline under 300 mM NaCl. The estimated contribution of proline to Is declined as with NO (3) (-) -N supply increased from 1 to 10 mM, while the contributions of nitrate to Is were enhanced under 300 mM NaCl. This suggested that higher accumulation of nitrate in the vacuole alleviated the effects of salinity stress on the plant by balancing the osmotic potential. In conclusion, NO (3) (-) -N played both nutritional and osmotic roles in T. laxa Willd. in saline conditions.
学科主题	自然地理学 ; 作物栽培学与耕作学
收录类别	SCI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/9962]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Ding,Xiaodong,Tian,et al. Effects of NO (3) (-) -N on the growth and salinity tolerance of Tamarix laxa Willd[J]. PLANT AND SOIL,2010,331(40545):57-67.
APA	Ding.,Xiaodong.,Tian.,Changyan.,Zhang.,...&Gu.(2010).Effects of NO (3) (-) -N on the growth and salinity tolerance of Tamarix laxa Willd.PLANT AND SOIL,331(40545),57-67.
MLA	Ding,et al."Effects of NO (3) (-) -N on the growth and salinity tolerance of Tamarix laxa Willd".PLANT AND SOIL 331.40545(2010):57-67.