Genetic variability and multivariate analyses of floral traits related to outcrossing in rice (Oryza sativa L.)
2018
Dela Rosa, D.G.M. | Hernandez, J.E. | Solis, R.O.
A detailed morphological characterization of 16 outcrossing-related floral traits of 70 cultivated rice parental lines was conducted in the screenhouse in Calauan, Laguna [Philippines]in 2016 dry season. The study was conducted to estimate the genetic parameters that can provide information towards floral trait improvement and to determine the association among the floral traits and among the rice parental lines based on their floral trait profiles. Stigma size (STGS), style length (STYL), total stigma exsertion rate (TSER), single stigma exsertion rate (SSER) and double stigma exsertion rate (DSER) showed high genetic advance as percentage of mean (%GA) coupled with high heritability (H2), which implies that considerable improvement could be achieved in these traits by simple phenotypic selection. Results of phenotypic correlation analysis show that TSER was positively and significantly correlated with stigma + style length (0.67) and spikelet length (0.84). Significant positive correlation (0.96) between pollen count per anther (POLC) and anther length (ANTL) was also obtained. Principal component analysis (PCA) on 10 floral parameters measured on 70 lines resulted in three principal components that accounted for 85% of total data variability. The loading plot showed the distinct aggregation of stamen traits POLC and ANTL as well as the pistil traits STGL, STYL, SPKL, SPKS and TSER. Moreover, the association of lines revealed by the score plot could allow identification and selection of superior rice lines for the parameters of interest.
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