%0 Journal Article
%T Growth, photosynthetic activity, and potassium and sodium concentration in rice plants under salt stress
%A Garc¨ªa Morales
%A Soledad
%A Trejo-T¨¦llez
%A Libia Iris
%A G¨®mez Merino
%A Fernando Carlos
%A Caldana
%A Camila
%A Espinosa-Victoria
%A David
%A Herrera Cabrera
%A Braulio Edgar
%J Acta Scientiarum. Agronomy
%D 2012
%I Scientific Electronic Library Online
%R 10.1590/S1807-86212012000300012
%X salt stress affects crop growth and productivity. in this study, we determined the growth, yield of photosystem ii (psii), and k+ and na+ concentration in root, stem, old leaves, and young leaves of two mexican varieties of rice, tres r¨ªos and cotaxtla. in addition, the k+/na+ ratio in stem and root of both varieties was determined. the experiment was conducted in a growth chamber under controlled conditions, under a completely randomized distribution, with a 2 x 2 (variety x salinity) factorial arrangement and 12 replications. plants were grown in a hydroponic solution for 15 days and then some of them were treated with 100 mm nacl; control plants (without naci treatment) were grown in parallel. salt stress caused 20 and 15% reductions in stem and root length, respectively, in the variety tres r¨ªos, while in the variety cotaxtla no significant differences were observed in these variables compared to the control. dry matter weight decreased by 24% in the variety tres r¨ªos. the quantum yield of psii decreased by 30% the third day of treatment application, in both varieties. na+ concentration was significantly (p ¡Ü 0.05) higher in naci-treated plants. in the variety tres r¨ªos, the yield of psii was completely eradicated six days after treatment implementation, while the k+ concentration in stem and older leaves also decreased and the lowest k+/ na+ ratio in stem was recorded, which could indicate that it is more susceptible to salinity than the variety cotaxtla.
%K oryza sativa
%K yield of photosystem ii
%K k+/na+ ratio
%K salinity.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1807-86212012000300012&lng=en&nrm=iso&tlng=en