The effect of substrate water potential (Ψ W ) in root growth and proline content of maize seedlings of Tuxpeño Sequía C0 (TSC0) and Tuxpeño Sequía C8 (TSC8), sensitive and resistant to drought respectively, were evaluated. Seventy two hours old seedlings, with 5 cm root length, were maintained for 24 h in vermiculite at Ψ W between −0.03 and −2.35 MPa. Root length, fresh and dry weight, number of lateral roots and proline content were evaluated. Root enlargement of TSC0 was significantly higher than TSC8 at −0.03 MPa, but the response was opposite at low substrate Ψ W . The number of lateral roots was reduced in 23% in TSC8 at the lowest substrate Ψ W (−2.35 MPa) but it was not significantly affected in TSC0. A higher proline content was quantified in the cell division root region than in differentiation root region in both maize populations (5.64 and 6.96 μmol 100 mg −1 of dry weight in TSC0 and TSC8, respectively); and Ψ W between −0.65 and −2.35 MPa induced a drastic and significant increase of proline content in both populations. The statistical interaction between maize population, substrate Ψ W , and root region was highly significant (P≤0.0039) for proline content. The results demonstrated that eight cycles of recurrent selection of Tuxpeño for drought tolerance induced a reduction of the number of secondary roots and proline content in the differentiation root region, but a proline increase in the cell division region when root seedling grow under no restrictive water conditions (Ψ W =−0.03 MPa), beside recurrent selection modified root reaction to low substrate Ψ W by accumulation of dry matter and proline.
Akkas, M; A.K.M.A. Prodhan; M.A. Haque. 1999. Effect of water stress on the anatomical characters of root and item of maize plant. Indian J. Agric. Res. 33:245–253.
Haque M.A. , 'Effect of water stress on the anatomical characters of root and item of maize plant ' (1999 ) 33 Indian J. Agric. Res. : 245 -253 .
Albarrán R., A.E. 2004. Efectos de la restricción de humedad en la fisiología, crecimiento, componentes del rendimiento y calidad del grano de centeno ( Secale cereale L.) y trigo ( Triticum aestivum L.). Tesis de maestría. Colegio de Postgraduados, Montecillo, México. 104 p.
Albarrán R. , '', in Tesis de maestría , (2004 ) -.
Bolaños, J.; G.O. Edmeades. 1993a. Eight cycles of selection for drought tolerance in lowland tropical maize. I. Responses in grain yield, biomass and radiation utilization. Field Crops Res. 31:233–252.
Edmeades G.O. , 'Eight cycles of selection for drought tolerance in lowland tropical maize. I. Responses in grain yield, biomass and radiation utilization ' (1993 ) 31 Field Crops Res. : 233 -252 .
Bolaños, J.; G.O. Edmeades. 1993b. Eight cycles of selection for drought tolerance in lowland tropical maize. II. Responses in reproductive behavior. Field Crops Res. 31:253–268.
Edmeades G.O. , 'Eight cycles of selection for drought tolerance in lowland tropical maize. II. Responses in reproductive behavior ' (1993 ) 31 Field Crops Res. : 253 -268 .
Bates, L.W.; Waldren R.P.; Teare L.D. 1973. Rapid determination of proline for water stress studies. Plant and Soil 39:205–207.
Teare L.D. , 'Rapid determination of proline for water stress studies ' (1973 ) 39 Plant and Soil : 205 -207 .
Cruz, R.T.; W.R. Jordan; M.C. Drew. 1992. Structural changes and associated reduction of hydraulic conductance in roots of Sorghum bicolor L. following exposure to water deficit. Plant Physiol. 99:203–212.
Drew M.C. , 'Structural changes and associated reduction of hydraulic conductance in roots of Sorghum bicolor L. following exposure to water deficit ' (1992 ) 99 Plant Physiol. : 203 -212 .
Dhanda, S.S.; G.S. Seit; R.K. Behl. 2002. Inheritance of seedling traits under drought stress conditions in bread wheat. Cereal Res. Comm. 30:293–300.
Behl R.K. , 'Inheritance of seedling traits under drought stress conditions in bread wheat ' (2002 ) 30 Cereal Res. Comm. : 293 -300 .
Ellis, R.H.; T.D. Hong; E.H. Roberts. 1985. General approaches to promoting seed germination. In: Handbook of seed technology for genebanks. Vol. II. Compendium of specific germination. International Board for Plant Genetic Resources. Rome. pp. 221–237.
Ferrarotto S., M. 2003. Proline accumulation in pigweed plants ( Amaranthus dubius Mart, and Amaranthus cruentus L.) growing under water stress conditions. Rev. Fac. Agron., Universidad del Zulia 20:453–460.
Ferrarotto S. , 'Proline accumulation in pigweed plants (Amaranthus dubius Mart, and Amaranthus cruentus L.) growing under water stress conditions ' (2003 ) 20 Rev. Fac. Agron., Universidad del Zulia : 453 -460 .
Hochholdinger, F.; K. Woll; M. Sauer; D. Dembinsky. 2004. Genetic dissection of root formation in maize ( Zea mays ) reveals root-type specific developmental programmes. Annals Bot. 93:359–368.
Dembinsky D. , 'Genetic dissection of root formation in maize (Zea mays) reveals root-type specific developmental programmes ' (2004 ) 93 Annals Bot. : 359 -368 .
Huang, B.; H. Gao. 2000. Root physiological characteristics associated with drought resistance in tall fescue cultivars. Crop Sci. 40:196–203.
Gao H. , 'Root physiological characteristics associated with drought resistance in tall fescue cultivars ' (2000 ) 40 Crop Sci. : 196 -203 .
Irizar-Garzar, M.B.G.; C.B. Peña-Valdivia. 2000. Chlorophyll and photosynthetic oxygen evolution in water-stressed triticale ( Tricosecale Wittmack) and wheat ( Triticum aestivum L.) during vegetative stage. Cereal Res. Comm. 28(4):387–394.
Peña-Valdivia C.B. , 'Chlorophyll and photosynthetic oxygen evolution in water-stressed triticale (Tricosecale Wittmack) and wheat (Triticum aestivum L.) during vegetative stage ' (2000 ) 28 Cereal Res. Comm. : 387 -394 .
Khan, I.A.; H.A.S. Habib S.; M.H.N. Tahir. 2004. Selection criteria based on seedling growth parameters in maize varies under normal and water stress conditions. Int. J. Agric. Biol. 6(2):252–256.
Tahir M.H.N. , 'Selection criteria based on seedling growth parameters in maize varies under normal and water stress conditions ' (2004 ) 6 Int. J. Agric. Biol. : 252 -256 .
Maiti, R.K., V.P. Singh, P. Wesche-Ebeling, E. Sanchez-Arreola, T. Hernández, E. Aguilar-Najera. 2004. Research advances on cold, drought and salinity tolerance and its mechanisms of resistance in maize ( Zea mays L.) — a review. Crop Res. (Hisar) 27:1–29.
Aguilar-Najera E. , 'Research advances on cold, drought and salinity tolerance and its mechanisms of resistance in maize (Zea mays L.) — a review ' (2004 ) 27 Crop Res. (Hisar) : 1 -29 .
Meloni, D.R.; Oliva M.A.; Ruiz H.A.; Martínez C.A. 2001. Contribution of proline and inorganic solutes to osmotic adjustment in cotton under salt stress. J. Plant Nutr. 24:599–612.
Martínez C.A. , 'Contribution of proline and inorganic solutes to osmotic adjustment in cotton under salt stress ' (2001 ) 24 J. Plant Nutr. : 599 -612 .
Nilsen, E.T.; D.M. Orcutt. 1996. Physiology of plants under stress. John Wiley & Sons, Inc. USA. 689 p.
Orcutt D.M. , '', in Physiology of plants under stress , (1996 ) -.
Ober, E.S.; R.E. Sharp. 1994. Proline accumulation in maize ( Zea mays L.) primary roots at low water potentials. Plant Physiol. 105:981–987.
Sharp R.E. , 'Proline accumulation in maize (Zea mays L.) primary roots at low water potentials ' (1994 ) 105 Plant Physiol. : 981 -987 .
Prechamandra, G.S.; Saneora H.; Fujita K.; Ogata S. 1992. Osmotic adjustment and stomatal response to water deficit in maize. J. Exp. Bot. 43:1451–1456.
Ogata S. , 'Osmotic adjustment and stomatal response to water deficit in maize ' (1992 ) 43 J. Exp. Bot. : 1451 -1456 .
Raymond, M.J.; Smimoff N. 2002. Proline metabolism and transport in maize seedlings at low water potential. Ann. Bot. 89:813–823.
Smimoff N. , 'Proline metabolism and transport in maize seedlings at low water potential ' (2002 ) 89 Ann. Bot. : 813 -823 .
Sánchez-Urdaneta, A.B.; C.B. Peña-Valdivia; J.R. Aguirre R.; C. Trejo; E. Cárdenas; A. Galicia J. 2003. Evaluación de la permeabilidad de las membranas radicales de plántulas de frijol ( Phaseolus vulgaris L.) silvestre y domesticado bajo déficit de humedad. Interciencia 28:597–603.
Galicia J A. , 'Evaluación de la permeabilidad de las membranas radicales de plántulas de frijol (Phaseolus vulgaris L.) silvestre y domesticado bajo déficit de humedad ' (2003 ) 28 Interciencia : 597 -603 .
Sánchez-Urdaneta, A.B.; C.B. Peña-Valdivia; J.R. Aguirre R.; C. Trejo; E. Cárdenas. 2004. Efectos del potencial de agua en el crecimiento radical de Agave salmiana Otto ex Salm-Dyck. Interciencia 29:626–631.
Cárdenas E. , 'Efectos del potencial de agua en el crecimiento radical de Agave salmiana Otto ex Salm-Dyck ' (2004 ) 29 Interciencia : 626 -631 .
SAS Institute. 1999–2000. SAS user’s guide: Statistics. Version 8.1. SAS Institute Inc. Cary, NC. USA. 1290 p.
'', in SAS user’s guide: Statistics , (1999 ) -.
Sharp, R.E.; W.K. Silk; T.C. Hsiao. 1988. Growth of the maize primary root at low water potentials. I. Spatial distribution of expansive growth. Plant Physiol. 87:50–57.
Hsiao T.C. , 'Growth of the maize primary root at low water potentials. I. Spatial distribution of expansive growth ' (1988 ) 87 Plant Physiol. : 50 -57 .
Sofo, A.; B. Dichio; C. Xiloyannis; A. Masia. 2004. Lipoxygenase activity and proline accumulation in leaves and roots of olive trees in response to drought stress. Physiol. Plantarum 121(1):58–65.
Masia A. , 'Lipoxygenase activity and proline accumulation in leaves and roots of olive trees in response to drought stress ' (2004 ) 121 Physiol. Plantarum : 58 -65 .
Tuberosa, R.; S. Salvi; M.C. Sanguineti; P. Landi; M. Maccaferri; S. Coti. 2002. Mapping QTLs regulating morpho-physiological traits and yield, case studies, shortcomings and perspectives in drought-stressed maize. Ann. Bot. 89:941–963.
Coti S. , 'Mapping QTLs regulating morpho-physiological traits and yield, case studies, shortcomings and perspectives in drought-stressed maize ' (2002 ) 89 Ann. Bot. : 941 -963 .
Turner, N.C. 1997. Further progress in crop water relations. Adv. Agron. 58:293–338.
Turner N.C. , 'Further progress in crop water relations ' (1997 ) 58 Adv. Agron. : 293 -338 .
Umayal, L.; R.C. Babu; P. Chezhian; S. Sadasivam. 2001. Water stress induced histological and enzymatic changes in roots of rice cultivars. Plant Archives 1(1/2):31–34.
Sadasivam S. , 'Water stress induced histological and enzymatic changes in roots of rice cultivars ' (2001 ) 1 Plant Archives : 31 -34 .
XingYuan, Z.; C. FuLiang, L. GuoHua. 2004. Physiological responses of two warm-season turfgrasses to persistent soil drought stress. Acta Prataculturae Sinica 13:84–88.
GuoHua L. , 'Physiological responses of two warm-season turfgrasses to persistent soil drought stress ' (2004 ) 13 Acta Prataculturae Sinica : 84 -88 .