Effects of supplementary potassium nitrate on growth and gas-exchange characteristics of salt-stressed citrus seedlings

Title:

Effects of supplementary potassium nitrate on growth and gas-exchange characteristics of salt-stressed citrus seedlings

Creator:

Khoshbakht, D., Ghorbani, A., Baninasab, B., Naseri, L. A., and Mirzaei, M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:73569efb-6396-4c4a-98ea-23faff1f1849
uuid:73569efb-6396-4c4a-98ea-23faff1f1849
issn:0300-3604
doi:10.1007/s11099-014-0068-z

Subject:

fotosyntéza, dusík, citrusy, photosynthesis, nitrogen, citruses, chlorophyll fluorescence, mineral nutrition, net gas exchange, rootstocks, salinity, salt stress, potassium nitrate, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

We investigated the effects of supplementary KNO3 and NaCl on one-year-old, potted Valencia orange (Citrus sinensis) scions grafted on Iranian mandarin Bakraii [Citrus reticulate × Citrus limetta] (Valencia/Bakraii) and Carrizo citrange [C. sinensis × Poncirus trifoliata] (Valencia/Carrizo) rootstocks. After watering plants for 60 days with 50 mM NaCl, the lowest reduction in dry mass, stomatal conductance, and chlorophyll (Chl) content was found in Valencia/Bakraii. Bakraii accumulated more Cl- and Na+ in roots and transferred less to Valencia leaves compared with Carrizo rootstock. Moreover, higher net photosynthetic rate was found in Valencia/Bakraii than those on Carrizo rootstock. NaCl caused a decrease in the maximal efficiency of PSII photochemistry (Fv/Fm) and effective quantum yield (ΦPSII) but elevated coefficient of nonphotochemical quenching. Salinity reduced Ca2+, Mg2+, and total N contents, and increased Na+/K+ ratio in leaves and roots of both grafting combinations. Salinity increased K+ and proline content in leaves and decreased K+ concentrations in roots of both grafting combinations. In salinized plants, nitrate supplementation (10 mM KNO3) reduced leaf abscission, Cl-, Na+, Na+/K+, and Ca2+ concentrations in leaves and roots of both combinations. K+ and N concentrations and proline increased in leaves of the nitrate-supplemented salinized plants. Supplementary nitrate increased leaf number and area, stem elongation, Chl content, Fv/Fm, and ΦPSII and stimulated photosynthetic activity. Thus, nitrate ameliorated the deleterious effects of NaCl stress and stimulated the plant metabolism and growth. It can be used as a vital treatment under such condition., D. Khoshbakht, A. Ghorbani, B. Baninasab, L. A. Naseri, M. Mirzaei., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

589-596

Source:

Photosynthetica | 2014 Volume:52 | Number:4

Harvested from:

CDK

Metadata only:

false