Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2013.1618.1622BevilacquaCaroline Borges MonzonDaisy Ramirez VenskeEduardo BasuSupratim ZimmerPaulo Dejalma 1220131622Low temperature or cold stress and deep sowing plays a pivotal
role in limiting rice (Oryza sativa L.) productivity in the temperate
rice growing regions as well as in tropical high lands worldwide. A better understanding
of stress tolerance mechanism in rice plants will help to develop rice germplasm
with improved field level tolerance under variable temperature and sowing deep
conditions. Using previously developed stress indices, this study presents results
from low temperature and deep sowing screening of four rice genotypes. A group
of 25 seeds per replicate (total of 3 replicates) was subjected to stress by
deep sowing (15 cm) while another group was subjected to cold stress (13°C-10
h/18°C-14 h) and the control group remained under optimum conditions (25°C
and sowing depth of 1.5 cm). The Geometric Mean (GM), Stress Tolerance Index
(STI) and Stress Susceptibility Index (SSI) were used to evaluate the genotypic
performance under control and stress conditions. The results indicate that it
was possible to identify superior genotypes for tolerance based on their stress
indices. The indices although correlated, were found to be effective for the
selection of genotypes with good yield potential under control and stress treatments
and can now be used for genotypic screening under field conditions.]]>Ministry of Agriculture and Agrarian Reform,2009Pages: 365Pages: 365Balbinot Jr., A.A., N.G. Fleck, D. Agostinetto, M.A. Rizzardi, A. Merotto Jr. and R.A. Vidal,200119305316Salem, M. B., H. Boussen, E. Mallek-Maalej, S. Rezgui and A. Slama,2010957983Cruz, R.P.D. and S.C.K. Milach,200030909917Da Cruz, H.L., C.S. Ferrari, G.E. Meneghello, V. Konflanz, P.D. Zimmer, P.S. Vinholes, M.A.S. De Castro,2007295260Fagundes, P.R.R., A.M. Magalhaes Jr. and S. Steinmetz,20102010Fernandez, G.C.J.,19931993pp: 257-270pp: 257-270Fischer, R.A. and R. Maurer,197829897912Florido, M., M. Alvarez, R.M. Lara, D. Plana, T. Shagarodsky and C. Moya,2009Solanum L. section Lycopersicum subsection Lycopersicum) germplasm.]]>303947Gale, M.D. and K.M. Devos,19989519711974Gealy, D.R., N.E. Saldain and R.E. Talbert,200014406412Guimaraes, C.M., L.F. Stone, J.P. de Oliveira, P.H.N. Rangel and C.A.P. Rodrigues,201141126134Hudak, J. and J. Salaj,19991999pp: 441-464pp: 441-464Malone, G., P.D. Zimmer, G.E. Meneghello, M.A.S. Castro and S.T. Peske,2007296167Mertz, L.M., F.A. Henning, R.C. Soares, R.F. Baldiga, F.B. Peske and D.M.D. Moraes,200931262270Perreto, E.L., S.T. Peske and J. Galli,1993154954Porch, T.G.,2006192390394Rashid, A., J.C. Stark, A. Tanveer and T. Mustafa,1999182231237Redona, E.D. and D.J. Mackill,199692395402Scott, S.J., R.A. Jones and W.A. Williams,19842411921198Yan, W.W., L.P. Bai, L. Zhang, G. Chen and J.G. Fan et al.,2010Forsythia mandshurica Uyeki and Forsythia viridissima Indl.]]>6556562Yoshida, S.,1981pp: 1-63pp: 1-63Vieira, R.D. and N.M. Carvalho,1994Pages: 164Pages: 164Zhang, S., H. Jiang, S. Peng, H. Korpelainen and C. Li,2011Populus cathayana to chilling.]]>62675686