skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices

Effects of N[O.sub.3.sup.-]-N on the growth and salinity tolerance of Tamarix laxa Willd

Ding, Xiaodong ; Tian, Changyan ; Zhang, Shirong ; Song, Jie ; Zhang, Fusuo ; Mi, Guohua ; Feng, Gu

Plant and soil, 2010-06, Vol.331 (1-2), p.57 [Periódico revisado por pares]

Springer

Texto completo disponível

Citações Citado por
  • Título:
    Effects of N[O.sub.3.sup.-]-N on the growth and salinity tolerance of Tamarix laxa Willd
  • Autor: Ding, Xiaodong ; Tian, Changyan ; Zhang, Shirong ; Song, Jie ; Zhang, Fusuo ; Mi, Guohua ; Feng, Gu
  • Assuntos: Salinity
  • É parte de: Plant and soil, 2010-06, Vol.331 (1-2), p.57
  • Descrição: The influence of N[O.sub.3.sup.-]-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 N[O.sub.3.sup.-]-N for 24 days. The relative growth rate of seedlings at 300 mM NaCl was lower than that of control plants at all N[O.sub.3.sup.-]-N levels, but the concentrations of organic N and total N in the twigs did not differ between the two NaCl treatments. Increasing N[O.sub.3.sup.-] supply under 300 mM NaCl improved the growth of T. laxa, indicating that N[O.sub.3.sup.-] played positive roles in improving salt resistance of the plant. The twigs of T. laxa Willd. accumulated mainly inorganic ions, especially [Na.sup.+] and [Cl.sup.-], to lower osmotic potential (ψs): the contributions of [Na.sup.+] and [Cl.sup.-] to ψs were estimated at 31% and 27% respectively, at the highest levels of supply of both NaCl and N[O.sub.3.sup.-]-N. The estimated contribution of N[O.sub.3.sup.-]-N to ψs was as high as 20% in the twigs in these conditions, indicating that N[O.sub.3.sup.-] was also involved in osmotic adjustment in the twigs. Furthermore, increases in tissue N[O.sub.3.sup.-] were accompanied by decreases in tissue [Cl.sup.-] and proline under 300 mM NaCl. The estimated contribution of proline to ψs declined as with N[O.sub.3.sup.-]-N supply increased from 1 to 10 mM, while the contributions of nitrate to ψs 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, N[O.sub.3.sup.-]-N played both nutritional and osmotic roles in T. laxa Willd. in saline conditions. Keywords Tamarix laxa willd * Salt stress * N[O.sub.3.sup.-]-N . Osmoregulation * Proline
  • Editor: Springer
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.