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| Heterosis for water uptake by maize (Zea mays L.) roots under water deficit: responses at cellular, single-root and whole-root system levels |
| XiaoFang LIU1,2,3, SuiQi ZHANG1,2, Lun SHAN1,2 |
1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China;
2 Northwest A&F University, Yangling 712100, China;
3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract To examine the potential heterosis for water uptake by maize roots, the hydraulic properties of roots in the F1 hybrid (Hudan 4) were compared with those of its inbred parents (♂ 478 and ♀ Tian 4) at cellular, single-root and whole-root system levels under well-watered and water-deficit conditions. The cell hydraulic conductivity (Lpc) decreased under water deficit, but the Lpc of the F1 was higher than that of its inbred parents with or without stress from water deficit. Marked reductions in Lpc were observed following Hg2+ treatment. The hydrostatic hydraulic conductivity of single roots (hydrostatic Lpsr) varied among genotypes under the two water treatments, with the highest in the F1 and the lowest in ♂ 478. Radial hydraulic conductivity (radial Lpsr) and axial hydraulic conductance (Lax) of the three genotypes varied similarly as Lpsr. The variations in hydraulic parameters were related to root anatomy. Radial Lpsr was negatively correlated with the ratio of cortex width to root diameter (R2=–0.77, P<0.01), whereas Lax was positively correlated with the diameter of the central xylem vessel (R2=0.75, P<0.01) and the cross-sectional area of xylem vessels (R2=0.93, P<0.01). Hydraulic conductivity (Lpwr) and conductance (Lwr) of the whole-root system followed the same trend under the two water treatments, with the highest values in the F1. The results demonstrated that heterosis for water uptake by roots of the F1 occurred at cellular, single-root and whole-root system levels under well-watered and water-deficit conditions.
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Received: 20 September 2012
Published: 01 June 2013
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| Fund: The National Basic Research Program of China (2009CB118604), the National Natural Science Foundation of China (30971714) and the Project 111 of the Ministry of Education of China (B12007) |
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| Ahmad I, Hellebust J A. 1988. The relationship between inorganic nitrogen metabolism and proline accumulation in osmoregulatory responses of two euryhaline microalgae. Plant Physiology, 88(2): 348–354.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(2): 119–123.Bramley H, Turner N C, Turner D W, et al. 2009. Roles of morphology, anatomy, and aquaporins in determining contrasting hydraulic behavior of roots. Plant Physiology, 150(1): 348–364.Bruce W B, Edmeades G O, Barker T C. 2002. Molecular and physiological approaches to maize improvement for drought tolerance. Journal of Experimental Botany, 53(366): 13–25.Choudhary M, Jetley U K, Abash Khan M, et al. 2007. Effect of heavy metal stress on proline, malondialdehyde, and superoxide dismutase activity in the cyanobacterium Spirulina platensis–S5. Ecotoxicology and Environmental Safety, 66(2): 204–209.Clarkson D T, Carvajal M, Henzler T, et al. 2000. Root hydraulic conductance: diurnal aquaporin expression and the effects of nutrient stress. Journal of Experimental Botany, 51(342): 61–70.Cruz R T, Jordan W R, Drew M C. 1992. Structural changes and associated reduction of hydraulic conductance in roots of Sorghum bicolor L. following exposure to water deficit. Plant Physiology, 99(1): 203–212.Doussan C, Pierret A, Garrigues E, et al. 2006. Water uptake by plant roots: II–Modelling of water transfer in the soil root-system with explicit account of flow within the root system–Comparison with experiments. Plant and Soil, 283(1–2): 99–117.Ehlert C, Maurel C, Tardieu F, et al. 2009. Aquaporin-mediated reduction in maize root hydraulic conductivity impacts cell turgor and leaf elongation even without changing transpiration. Plant Physiology, 150(2): 1093–1104.Frensch J, Steudle E. 1989. Axial and radial hydraulic resistance to roots of maize (Zea mays L.). Plant Physiology, 91(2): 719–726.Henzler T, Waterhouse R N, Smyth A J, et al. 1999. Diurnal variations in hydraulic conductivity and root pressure can be correlated with the expression of putative aquaporins in the roots of Lotus japonicus. Planta, 210(1): 50–60.Hochholdinger F, Hoecker N. 2007. Towards the molecular basis of heterosis. Trends in Plant Science, 12(9): 427–432.Hoecker N, Keller B, Piepho H P, et al. 2006. Manifestation of heterosis during early maize (Zea mays L.) root development. Theoretical and Applied Genetics, 112(3): 421–429.Hukin D, Doering-Saad C, Thomas C R, et al. 2002. Sensitivity of cell hydraulic conductivity to mercury is coincident with symplasmic isolation and expression of plasmalemma aquaporin genes in growing maize roots. Planta, 215(6): 1047–1056.Javot H, Lauvergeat V, Santoni V, et al. 2003. Role of a single aquaporin isoform in root water uptake. Plant Cell, 15(2): 509–522.Knipfer T, Fricke W. 2011. Water uptake by seminal and adventitious roots in relation to whole-plant water flow in barley (Hordeum vulgare L.). Journal of Experimental Botany, 62(2): 717–733.Lee E A, Tollenaar M. 2007. Physiological basis of successful breeding strategies for maize grain yield. Crop Science, 47: S202–S215.Lee S H, Chung G C, Steudle E. 2005. Gating of aquaporins by low temperature in roots of chilling-sensitive cucumber and chilling-tolerant figleaf gourd. Journal of Experimental Botany, 56(413): 985–995.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(1–2): 25–34.Maurel C, Simonneau T, Sutka M. 2010. The significance of roots as hydraulic rheostats. Journal of Experimental Botany, 61(12): 3191–3198.Melchior W, Steudle E. 1993. Water transport in onion (Allium cepa L.) roots (changes of axial and radial hydraulic conductivities during root development). Plant Physiology, 101(4): 1305–1315.Mu Z X, Zhang S Q, Zhang L S, et al. 2006. Hydraulic conductivity of whole root system is better than hydraulic conductivity of single root in correlation with the leaf water status of maize. Botanical Studies, 47(2): 145–151.Ranathunge K, Steudle E, Lafitte R. 2005. A new precipitation technique provides evidence for the permeability of casparian bands to ions in young roots of corn (Zea mays L.) and rice (Oryza sativa L.). Plant Cell and Environment, 28(11): 1450–1462.Rieger M, Litvin P. 1999. Root system hydraulic conductivity in species with contrasting root anatomy. Journal of Experimental Botany, 50(331): 201–209.Steudle E, Frensch J. 1989. Osmotic responses of maize roots. Planta, 177(3): 281–295.Steudle E. 1993. Pressure probe techniques: basic principles and application to studies of water and solute relations at the cell, tissue and organ level. In: Smith J A C, Griffiths H. Water Deficits: Plant Responses from Cell to Community. Oxford: Bios Scientific, 5–36.Steudle E, Frensch J. 1996. Water transport in plants: role of the apoplast. Plant and Soil, 187(1): 67–79.Steudle E, Peterson C A. 1998. How does water get through roots. Journal of Experimental Botany, 49(322): 775–788.Sun H Y, Shen Y J, Yu Q, et al. 2010. Effect of precipitation change on water balance and WUE of the winter wheat–summer maize rotation in the North China Plain. Agricultural Water Management, 97(8): 1139–1145.Tollenaar M, Ahmadzadeh A, Lee E A. 2004. Physiological basis of heterosis for grain yield in maize. Crop Science, 44(6): 2086–2094.Wan X C, Steudle E, Hartung W. 2004. Gating of water channels (aquaporins) in cortical cells of young corn roots by mechanical stimuli (pressure pulses): effects of ABA and of HgCl2. Journal of Experimental Botany, 55(396): 411–422.Wu A H, Zhang S Q, Deng X P, et al. 2006a. Expression of PIP2-5 in maize root systems under water deficit. Plant Physiology Communications, 42(3): 457–460.Wu A H, Zhang S Q, Deng X P, et al. 2006b. Expression of ZmPIP1 subgroup genes in maize roots under water shortage. Journal of Plant Physiology and Molecular Biology, 32(5): 557–562.Ye Q, Steudle E. 2006. Oxidative gating of water channels (aquaporins) in corn roots. Plant Cell and Environment, 29(4): 459–470.Zhang W H, Tyerman S D. 1999. Inhibition of water channels by HgCl2 in intact wheat root cells. Plant Physiology, 120(3): 849–857. Zhao C X, Deng X P, Zhang S Q, et al. 2004. Advances in the studies on water uptake by plant roots. Acta Botanica Sinica, 46(5): 505–514.Zhao C X, Deng X P, Shan L, et al. 2005. Changes in root hydraulic conductivity during wheat evolution. Journal of Integrative Plant Biology, 47(3): 302–310. |
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