Genetic Variation for Grain Yield and Related Traits in Temperate Red Rice (Oryza sativa L.) Ecotypes

Abstract

The present study was carried out in Kashmir (India) to assess the genetic variability for grain yield and component traits among 14 red rice ecotypes from temperate region (locally known as Zag for its coloured kernels) and correlation and path coefficients were also studied for fifteen agro-morphological characters. Genotypic and phenotypic coefficients of variation were high for grain yield, secondary branches per panicle and panicle weight; moderate for grain number per panicle, grain length:breadth (L:B) ratio and panicle density. High heritability accompanied by high to moderate genetic advance for panicle density, days to 50% flowering, plant height, grain number indicated the predominance of additive gene action for the expression of these characters. Grain yield was found to be positively and significantly correlated with number of tiller per plant, panicle density m-2 and number of grain per panicle at both genotypic and phenotypic levels indicating the importance of these characters for yield improvement in this material. The results of genotypic path analysis revealed that panicle density had the highest positive direct effect followed by plant height and days to flower. The overall results indicated that selection favouring higher panicle density, test weight and panicle weight and medium plant height with a reasonable balance for moderate grain number would help to achieve higher grain yield in this population of red rice ecotypes.

Association of arbuscular mycorrhizal fungi (AMF) with Brachiaria precumbens (Poaceae) in tailing and its potential to increase the growth of maize (Zea mays)

“…In general, traditional rice cultivar contained several important genes related to acidity tolerance, salinity, and metals contamination (Ogunbayo et al 2007). Further, this germplasm is shaped for a long time by the interplay between farmer selection and adapted to the local conditions (Sanghera et al 2013). Hence, its becomes an indispensable part of the local culture and traditions of ricegrowing people across Asia over many generations (Thomson et al 2009).…”

Development of a mini core collection from Sri Lankan traditional rice for flowering time variation

“…Out of 50 morphological, physiological and disease resistant traits, 33 traits including LL were significantly correlated with DF in temperate japonica rice (Hori et al, 2012). A significant correlation was observed for DF with PL and PW (Ashfaq et al, 2012) while CN and grain yield was found to be positively correlated for 14 red rice genotypes of Indian rice by Sanghera et al (2013). CD correlates with PL and SW correlates with PW for the PCA of flowered accessions in this study.…”

“…Accessions of similar morphology were grouped in to individual clusters in Hierarchical cluster analysis (Supplementary table 1 accessions, 6 (5612, 5611, 5610, 3257, 3489, 6282) 2014). Genetic basis for variations in pericarp color and lemma and palea color had been previously described by Chandrarathna (1964) and Sanghera et al (2013). Among the seed characters of not-flowered accessions in core collection, Ma wee 4561 was an awn-less variety with white pericarp color which was different from other representative accessions of not-flowered dendrogram with awns and brown or light brown pericarp color.…”

The Improvement of Early Maturity Red Rice Mutant Trait for Drought Tolerance

“…The treatments were arranged in a split-plot design such as 5 -G R200 -1-2 and radix accession. The main plot was the soil moisture of 25, 50, 75 and 100% (control).…”

“…4 Red rice paddy accession has longer time to harvest (121-138 days) with a flowering time of 91-107 days. 5,6 Red rice accession is not classified as drought tolerant so it has lower yield (an average of 2 tons/ha). 7 Currently, there is only one variety of red rice classified as upland types, which is Inpago 7 (4.6 tons/ha).…”