Abstract
Thirty-days-old plants of two cultivars of okra (Hibiscus esculentus L.), Sabzpari and Chinese-red, were subjected for 30 d to two water regimes (100 and 60 % field capacity). Leaf water potential and osmotic potential of both lines decreased significantly with the imposition of drought. Both the leaf pressure potential and osmotic adjustment were much lower in Chinese-red than those in Sabzpari. Chlorophyll (Chl) b content increased, whereas Chl a content remained unchanged and thus Chl a/b ratios were reduced in both lines. Drought stress also caused a significant reduction in net photosynthetic rate (P N), transpiration rate (E), stomatal conductance (g s), and water use efficiency (WUE) especially in cv. Sabzpari. The lines did not differ in intrinsic WUE (P Ngs) or intercellular/ambient CO2 ratio. Overall, the growth of two okra cultivars was positively correlated with P N, but not with g s or P N/E, and negatively correlated with osmotic adjustment.
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Arnon, D.I.: Copper enzymes in isolated chloroplasts. Polyphenoloxidase in Beta vulgaris.-Plant Physiol. 24: 1-15, 1949.
Ashraf, M., Arfan, M., Ahmad, A.: Salt tolerance in okra: ion relations and gas exchange characteristics.-J. Plant Nutr. (in press), 2003.
Ashraf, M., Bokhari, M.H., Chishti, S.N.: Variation in osmotic adjustment of accessions of lentil (Lens culinaris Medic.) in response to drought stress.-Acta bot. neerl. 41: 51-62, 1992.
Ashraf, M., Shahbaz, M., Mahmood, S., Rasul, E.: Relationships between growth and photosynthetic characteristics in pearl millet (Pennisetum glaucum) under limited water deficit conditions with enhanced nitrogen supplies.-Belg. J. Bot. 134: 131-144, 2001.
Ashraf, M., Sharif, R.: Assessment of inter-cultivar/line variation of drought resistance in a potential oil-seed crop, Ethiopian mustard (Brassica carinata A.Br.).-Arch. Acker. Pflanz. Boden. 43: 251-165, 1998.
Blum, A.: Osmotic adjustment and growth of barley genotypes under drought stress.-Crop Sci. 29: 230-233, 1989.
Bray, E.A.: Plant responses to water deficit.-Trends Plant Sci. 2: 48-54, 1997.
Estill, K., Delaney, R.H., Smith, W.K., Ditterline, R.L.: Water relations and productivity of alfalfa leaf chlorophyll variants.-Crop Sci. 31: 1229-1233, 1991.
Fukai, S., Cooper, M.: Development of drought-resistant cultivars using physio-morphological traits in rice.-Field Crops Res. 40: 67-86, 1995.
Garcia, A.L., Torrecillas, A., León, A., Ruiz-Sánchez, M.C.: Biochemical indicators of the water stress in maize seedlings.-Biol. Plant. 29: 45-48, 1987.
Green, B.R.: The chlorophyll-protein complexes of higher plant photosynthetic membranes or Just what green band is that?-Photosynth. Res. 15: 3-32, 1988.
Majumdar, S., Ghosh, S., Glick, B.R., Dumbroff, E.B.: Activities of chlorophyllase, phosphoenolpyruvate carboxylase and ribulose-1,5-bisphosphate carboxylase/oxygenase in the primary leaves of soybean during senescence and drought.-Physiol. Plant. 81: 473-480, 1991.
Morgan, J.M.: Osmoregulation and water stress in higher plants.-Annu. Rev. Plant Physiol. 35: 299-319, 1984.
Morgan, J.M.: Osmotic components and properties associated with genotypic differences in osmoregulation in wheat.-Aust. J. Plant Physiol. 19: 67-76, 1992.
Morgan, J.M., Tan, M.K.: Chromosomal location of a wheat osmoregulation gene using RFLP analysis.-Aust. J. Plant Physiol. 35: 803-806, 1996.
Munns, R.: Why measure osmotic adjustment?-Aust. J. Plant Physiol. 15: 717-726, 1988.
Niknam, S.R., Turner, D.W.: Physiological aspects of drought tolerance in Brassica napus and B. juncea.-In: New Horizons for an Old Crop. Proceedings of the 10th International Rapeseed Congress, Canberra 1999.
Ranjbarfordoei, A., Samson, R., Van Damme, P., Lemeur, R.: Effects of drought stress induced by polyethylene glycol on pigment content and photosynthetic gas exchange of Pistacia khinjuk and P. mutica.-Photosynthetica 38: 443-447, 2000.
Ranjith, S.A., Meinzer, F.C.: Physiological correlates of variation in nitrogen-use efficiency in two contrasting sugarcane cultivars.-Crop Sci. 37: 818-825, 1997.
Sage, R.F., Pearcy, R.W.: The nitrogen use efficiency of C3 and C4 plants. II. Leaf nitrogen effects on the gas exchange characteristics of Chenopodium album (L.) and Amaranthus retroflexus (L.).-Plant Physiol. 84: 959-963, 1987.
Serraj, R., Sinclair, T.R.: Osmolyte accumulation: can it really help increase crop yield under drought conditions?-Plant Cell Environ. 25: 333-341, 2002.
Shackel, K.A., Hall, A.E.: Comparison of water relations and osmotic adjustment in sorghum and cowpea under field conditions.-Aust. J. Plant Physiol. 10: 423-435, 1983.
Snedecor, G.W., Cochran, W.G.: Statistical Methods. 7th Ed.-Iowa State University Press, Ames 1980.
Srinivasa Rao, N.K., Bhatt, R.M., Sadashiva, A.T.: Tolerance to water stress in tomato cultivars.-Photosynthetica 38: 465-467, 2000.
Tabaeizadeh, Z.: Drought-induced responses in plant cells.-Int. Rev. Cytol. 182: 193-247, 1998.
Taiz, L., Zeiger, E.: Plant Physiology. 2nd Ed.-Sinauer Associates Publ., Sunderland 1998.
Turner, N.C.: Crop water deficits: a decade of progress.-Adv. Agron. 39: 1-51, 1986.
Wilson, J.R., Ludlow, M.M., Fisher, M.J., Schulze, E.D.: Adaptation to water stress of leaf water relations characteristics of some tropical forage grasses and legume in a semi-arid environment.-Aust. J. Plant Physiol. 7: 207-220, 1980.
Winter, S.R., Musick, J.T., Porter, K.B.: Evaluation of screening techniques for breeding drought-resistant winter wheat.-Crop Sci. 28: 512-516, 1988.
Wright, P.R., Morgan, J.M., Jessop, R.S.: Turgor maintenance by osmoregulation in Brassica napus and B. juncea under field conditions.-Ann. Bot. 80: 313-319, 1997.
Zhu, J.-K., Hasegawa, P.M., Bressan, R.A.: Molecular aspects of osmotic stress in plants.-Crit. Rev. Plant Sci. 16: 253-277, 1997.
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Ashraf, M., Arfan, M., Shahbaz, M. et al. Gas Exchange Characteristics and Water Relations in Some Elite Okra Cultivars Under Water Deficit. Photosynthetica 40, 615–620 (2002). https://doi.org/10.1023/A:1024368522742
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DOI: https://doi.org/10.1023/A:1024368522742