Growth and Morphological Characteristics of Red Rice (Oryza sativa) Biotypes

Abstract

Pot experiments were conducted in the field at Stuttgart, AR, during 1982 and 1983 to evaluate growth and morphological differences between strawhull and blackhull red rice (Oryza sativaL. ♯ ORYSA) biotypes collected from Arkansas, Louisiana, and Texas. All red rice biotypes were compared with rice (Oryza sativaL.) cultivars ‘Lebonnet’ and ‘Nortai’. Growth and morphological differences were greatest between cultivars and red rice biotypes, less between blackhull and strawhull types, and least among collections within blackhull or strawhull. Cultivars emerged slower, were shorter, tillered less, produced less straw and fewer panicles/plant, had a lower leaf area index, and had less grain shattering than most of the red rice biotypes. Blackhull red rice biotypes tillered 27% more, produced 18% more straw, and had later maturity than strawhull. Blackhull red rice from Arkansas emerged earlier, tillered 6 to 38% more, and produced 8 to 38% more panicles per plant than other red rice biotypes, whereas blackhull red rice from Texas was 11 to 26% taller at maturity than other biotypes.

Red rice(Oryza sativa):Competition studies for management decisions

“…As noted by Diarra et al (1985a) red rice height advantage over rice was associated with red rice's superior competitiveness ( Figure 2). Red rice had no clear advantage in leaf area or early tillering over Oryzica 1 (Figure 1a, b, d and e).…”

Origin of Weedy Rice Grown in Bhutan and the Force of Genetic Diversity

“…c ND and D mean non-deletion and deletion type ORF100, respectively. by direct seeding and by mechanical means (Oka 1988;Diarra et al 1994;Suh and Ha 1994;Catala-Forner 1995).…”

The Weedy Rice Complex in Costa Rica. I. Morphological Study of Relationships Between Commercial Rice Varieties, Wild Oryza Relatives and Weedy Types

“…The weedy rice complex mainly includes plants setting red pericarp seeds, known as red rice (Olofsdotter et al 2000), although some morphotypes have white pericarps (Herna´ndez et al 1979). Weedy rice plants are usually taller than commercial varieties, have more tillers and panicles per plant, but frequently produce less seed (Diarra et al 1985;Noldin et al 1999). Planting contaminated seed increases the infestation levels of weedy rice in the field.…”

“…Several morphological studies of weedy rice have been reported in Colombia (Montealegre and Clavijo 1991), Venezuela (Ortiz et al 1999), Brazil (Agostinetto et al 2001), Mexico (Herna´ndez et al 1979) and the United States (Noldin et al 1999). Weedy rice has been traditionally classified as O. sativa L. subspecies indica or japonica, based on morphological characters (Diarra et al 1985;Langevin et al 1990;Kwon et al 1991) and molecular markers (RFLP and RAPDs) (Shu et al 1997;Federeci et al 2001). Furthermore, Vaughan et al (2001) demonstrated in a genetic study using microsatellites that weedy rice from Arkansas, Louisiana, Mississippi and Texas (USA) also included the Asian wild species O. nivara and O. rufipogon Griff.…”