Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering

By Tahere Azhiri- Sigari, A. Yamauchi, A. Kamoshita, Len J. Wade. 2000

116 citations recorded by the source corpus.

Abstract Genotypic variation in the root system is a potential source for improving drought tolerance of rainfed lowland rice (Oryza sativa L.). Our work aimed at characterizing both constitutive root traits (those present under well -watered conditions) and adaptive root traits (those developed in response to drought and rewatering) among eight diverse rice genotypes in three sets of greenhouse experiments (experiments 1, 2, and 3). Under well–watered conditions, genotypic variation was observed in root to shoot ratio, root growth rate, specific root length, deep root ratio, root mass per tiller, and root thickness. CT9993 and IR58821 had a high root to shoot ratio, deep and thick root system, and high root mass per tiller. However, CT9993 had a slow root growth rate and short specific root length. In response to drought in experiments 2 and 3, the total amount of assimilate distributed to roots was reduced and roots became thinner, but the proportion of total assimilate supply assigned to deeper layers increased, thereby maintaining deep root mass and increasing specific root length. On rewatering, root to shoot ratio increased, surface roots increased, and roots became thicker. During drought, NSG19, KDML105, Mahsuri, and IR58821 partitioned a larger proportion of assimilate to deep roots and had more deep root branching.

Subfields: Plant Science

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Citations in the corpus

Rooting depth and water use efficiency of tropical maize inbred lines, differing in drought tolerance (2009, background): “Concerning the first point, thicker roots tended to increase root length density in deeper soil layers in rice (Azhiri-Sigari et al. 2000; Kato et al. 2006).”
Genotypic Variation in Root Growth Angle in Rice (Oryza sativa L.) and its Association with Deep Root Development in Upland Fields with Different Water Regimes (2006, unknown): “Among environmental effects, the effects of water regime on deep root development of rice grown in pots is well understood (Asch et al. 2004; Azhiri-Sigari et al. 2000; Bañoc et al. 2000; Price et al. 2002).”
Fractal analysis on root systems of rice plants in response to drought stress (2009, background): “CT9993 shows low osmotic adjustment and is well adapted to rainfed lowland conditions with deep and thicker root system and strong root penetration ability (Wade et al., 2000; Azhiri-Sigari et al., 2000; Samson et al., 2002).”
Abiotic stress tolerance in rice for Asia: progress and the future (2004, background): “Differences have also been observed in the adaptive response of root distribution to soil drying (Azhiri-Sigari et al. 2000; Liu et al. 2004b).”
Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering (2000, background): “In the following papers, root growth (Azhiri-Sigari et al., 2000) and water extraction pattern (Kamoshita et al.”
Phenotypic and genotypic analysis of drought-resistance traits for development of rice cultivars adapted to rainfed environments (2008, result): “%) in pot experiments (Azhiri-Sigari et al., 2000; Kamoshita et al., 2004).”
Root biology and genetic improvement for drought avoidance in rice (2011, background): “Other comparisons among rice varieties (Thanh et al., 1999; Azhiri-Sigari et al., 2000; Kondo et al., 2003; Matsuo and Mochizuki, 2009a; Uga et al., 2009; Henry et al., 2011) further reflect the genetic diversity for root traits in rice.”
Genetic variability of drought-avoidance root traits in the mini-core germplasm collection of chickpea (Cicer arietinum L.). (2006, background): “This ratio is relatively high compared to rice that has less than 20% in average (Azhiri-Sigari et al., 2000).”
Root plasticity as the key root trait for adaptation to various intensities of drought stress in rice (2011, unknown): “Several such examples have been reported for other rice cultivars ( Azhiri-Sigari et al. 2000 ; I ngram et al.1994; Kamoshita et al. 2000; Wang et al. 2009).”
Advances in Drought Resistance of Rice (2009, background): “Azhiri-Sigari et al. (2000) characterized deep root systems using the following three root traits: 1) root-to-shoot ratio; 2) deep root ratio (ratio of deep root mass below 30 cm depth to total root mass); and 3) specific root length (root length per unit root weight); the first two being important…”
Genotypic Variation in Response of Rainfed Lowland Rice to Prolonged Drought and Rewatering (2004, background): “drought and recovery Previous studies have examined how deep root development, water extraction, leaf growth, osmotic adjustment, and shoot biomass production are affected by drought and rewatering (Azhiri-Sigari et al., 2000; Banoc et al., 2000a,b; Wade et al., 2000; Kamoshita et al., 2000, 2001).”