Performance of low phosphorus tolerant rice genotypes under drought stress

Cleber Morais Guimarães, Luís Fernando Stone, Maria da Conceição Santana Carvalho, José Manoel Colombari Filho

Resumo


The identification of genotypes more tolerant to water deficit and more efficient in the use of nutrients little available in the soil is an important low-cost strategy to promote sustainable agriculture in marginalized regions. In this sense, a study was carried out in the SITIS Phenotyping Platform of the Embrapa Rice & Beans, with the objective of evaluating the drought tolerance of upland rice genotypes tolerant to phosphorus (P) deficiency. The experimental design was performed in a randomized complete block with split-split plots and two replications. In the plots were established two water regimes (with and without water deficit), in the subplots two soil phosphorus contents (25 and 200 mg dm-3) and in sub-subplots 48 upland rice genotypes. Under water deficit, the grain yield was higher at the lowest soil P content; however, in the absence of water deficit, it was higher under the highest soil P content. The genotypes AB 062037, AB 062041, AB 062138, Arroz Mato Grosso, BRA 02601, BRA 052045, CNA 4098, CNA 6187, Guapa, Guaporé and Rio Paranaíba were classified in the most productive group under both water regimes. The most productive genotypes under water deficit showed higher root density in the deeper soil layers. The most productive genotypes in the two water regimes were also those that showed the highest evapotranspiration.


Palavras-chave


Oryza sativa L., abiotic stress, root system, evapotranspiration

Referências


Blum A (2009) Effective use of water (EUW) and not water-use efficiency (WUE) is the target of crop yield improvement under drought stress. Field Crops Research, 112:119-123.

Centrito M, Lauteri M, Monteverdi MC & Serraj R (2009) Leaf gas exchange, carbon isotope discrimination, and grain yield in contrasting rice genotypes subjected to water deficits during the reproductive stage. Journal of Experimental Botany, 60:2325-2339.

Chin JH, Lu X, Haefele SM, Gamuyao R, Ismail A, Wissuwa M & Heuer S (2010) Development and application of gene-based markers for the major rice QTL Phosphorus uptake 1. Theoretical and Applied Genetics, 120:1073-1086.

Chin JH, Gamuyao R, Dalid C, Bustamam M, Prasetiyono J, Moeljopawiro S, Wissuwa M & Heuer S (2011) Developing rice with high yield under phosphorus deficiency: Pup1 sequence to application. Plant Physiology, 156:1202-1216.

Costa JPV da, Barros NF de, Albuquerque AW de, Moura Filho G & Santos JR (2006) Fluxo difusivo de fósforo em função de doses e da umidade do solo. Revista Brasileira de Engenharia Agrícola e Ambiental, 10:828-835.

Crusciol CAC, Soratto RP, Arf O & Mateus GP (2006) Yield of upland rice cultivars in rainfed and sprinkler-irrigated systems in the Cerrado region of Brazil. Australian Journal of Experimental Agriculture, 46:1515-1520.

Dingkuhn M, Luquet D, Kim H, Tambour L & Clement-Vidal A (2006). EcoMeristem, a model of morphogenesis and competition among sinks in rice. 2. Simulating genotype responses to phosphorus deficiency. Functional Plant Biology, 33:325-337.

Guimarães CM, Castro AP de, Stone LF & Oliveira JP de (2016) Drought tolerance in upland rice: identification of genotypes and agronomic characteristics. Acta Scientiarum. Agronomy, 38:201-206.

Guimarães CM, Stone LF, Rangel PHN & Silva AC de L (2013) Tolerance of upland rice genotypes to water deficit. Revista Brasileira de Engenharia Agrícola e Ambiental, 17:805-810.

Ji K, Wang Y, Sun W, Lou Q, Mei H, Shen S & Chen H (2012) Drought-responsive mechanisms in rice genotypes with contrasting drought tolerance during reproductive stage. Journal of Plant Physiology, 169:336-344.

Kamoshita A, Rodriguez R, Yamauchi A & Wade LJ (2004) Genotypic variation in response of rainfed lowland rice to prolonged drought and dewatering. Plant Production Science, 7:406-420.

Kato Y & Okami M (2010) Root growth dynamics and stomatal behaviour of rice (Oryza sativa L.) grown under aerobic and flooded conditions. Field Crops Research, 117:9-17.

Matsuo N, Ozawa K & Mochizuki T (2009) Genotypic differences in root hydraulic conductance of rice (Oryza sativa L.) in response to water regimes. Plant and Soil, 316:25–34.

Mishra A & Salokhe VM (2011) Rice root growth and physiological responses to SRI water management and implications for crop productivity. Paddy and Water Environment, 9:41–52.

Otani T & Ae N (1996) Sensitivity of phosphorus uptake to change in root length and soil volume. Agronomy Journal, 88:371-375.

Pinheiro B da S, Castro E da M de & Guimarães CM (2006) Sustainability and profitability of aerobic rice production in Brazil. Field Crops Research, 97:34-42.

Wissuwa M & Ae N (2001) Genotypic variation for tolerance to phosphorus deficiency in rice and the potential for its exploitation in rice improvement. Plant Breeding, 120:43-48.

Yang C, Yang L, Yang Y & Ouyang Z (2004) Rice root growth and nutrient uptake as influenced by organic manure in continuously and alternately flooded paddy soils. Agricultural Water Management, 70:67–81.

Zain NAM, Ismail MR, Puteh A, Mahmood M & Islam MR (2014) Impact of cyclic water stress on growth, physiological responses and yield of rice (Oryza sativa L.) grown in tropical environment. Ciência Rural, 44:2136-2141.


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