Abstract
Disparity in the root morphology of six rice (Oryza sativa L.) genotypes varying in potassium (K) efficiency was studied with three K levels: 5 mg/L (low), 10 mg/L (moderate) and 40 mg/L (adequate) in hydroponic culture. Morphological ’parameters included root length, surface area, volume and count of lateral roots, as well as fine (diameter<0.2 mm) and thick (diameter>0.2 mm) roots. The results indicate that the root growth of all genotypes was reduced under low K, but moderate K deficiency increased the root length of the efficient genotypes. At deficient and moderate K levels, all the efficient rice genotypes developed more fine roots (diameter<0.2 mm) than the inefficient ones. Both fine root count and root surface area were found to be the best parameters to portray K stress in rice. In accordance with the root morphology, higher K concentrations were noted in shoots of the efficient genotypes when grown at moderate and deficient K levels, indicating that root morphology parameters are involved in root uptake for K and in the translocatio of K up to shoots. K deficiency affected not only the root morphology, but also the root ultra-structure. The roots of high-efficient genotypes had stronger tolerance to K deficient stress for root membrane damage, and could maintain the developed root architecture to adapt to the low K growth medium.
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References
Baligar, V.C., Barber, S.A., 1979. Genotype differences of corn in ion uptake. Agron. J., 71(5):870–873.
Chen, J.J., Gabelman, W.H., 1995. Isolation of tomato strains varying in potassium acquisition using a sand-zeolite culture system. Plant Soil, 176(1):65–70. [doi:10.1007/BF00017676]
Dobermann, A., Kassman, K.G., Mamaril, C.P., Sheehy, J.E., 1998. Management of phosphorus, potassium, and sulfur in itensive irrigated lowland rice. Field Crops Res., 56(1–2): 113–138. [doi:10.1016/S0378-4290(97)00124-X]
Høgh-Jensen, H.H., Pedersen, M.B., 2003. Morphological plasticity by crop plants and their potassium use efficiency. J. Plant Nutr., 26(5):969–984. [doi:10.1081/PLN-120020069]
James, D.W., Tindall, T.A., Turst, C.J., Hussein, A.N., 1995. Alfalfa cultivar responses to phosphorus and potassium deficiency: biomass. J. Plant Nutr., 18(11):2431–2445.
Liu, F.H., Liang, X.N., Zhang, S.W., 2000. Accumulation and utilization efficiency of potassium in ramie varieties. J. Plant Nutr., 23(2):785–792.
Liu, X.G., Liu, Z.X., Liu, F.X., 1987. Screening of rice genotypes tolerant to low K and their K uptake characteristics. J. Fujian Agric. Acad., 2(2):10–17 (in Chinese).
Lynch, J.P., Lynch, A.F., Jonathan, P., 2007. Roots of the second green revolution. Aust. J. Bot., 55(5):493–512. [doi:10.1071/BT06118]
Marschner, H., 1995. Mineral Nutrition of Higher Plants. Academic Press, San Diego.
Mengel, K., Steffens, D., 1985. Potassium uptake of ryegrass (Lolium perenne) and red clover (Trifolium pratense) as related to root parameters. Biol. Fert. Soils, 1(1):53–58. [doi:10.1007/BF00710971]
Peng, H.Y., Tian, S.K., Yang, X.E., 2005. Changes of root morphology and Pb uptake by two species of Elsholtzia under Pb toxicity. J. Zhejiang Univ. Sci. B, 6(6):546–552. [doi:10.1631/jzus.2005.B0546]
Pettersson, S., Jensén, P., 1983. Variation among species and varieties in uptake and utilization of potassium. Plant Soil, 72(2–3):231–237. [doi:10.1007/BF02181962]
Rengel, Z., Marschner, P., 2005. Nutrient availability and management in the rhizosphere: exploiting genotypic differences. New Phytol., 168(2):305–312. [doi:10.1111/j.1469-8137.205.01558.x]
Sale, P.W.G., Campbell, L.C., 1987. Differential response to K deficiency among soybean cultivars. Plant Soil, 104(2):183–190. [doi:10.1007/BF02372531]
Shea, P.E., Gerloff, G.C., Gabelman, W.H., 1968. Differing efficiencies of potassium utilization in strains of snapbeans, Phaseolus vulgaris L. Plant Soil, 28(2):337–346. [doi:10.1007/BF01880251]
Wang, X.G., Cao, M.J., Wang, W., 2005. Effect of potassium concentration in the soil on the morphological and physiological characteristics of soybean root. Soybean Sci., 24(2):126–130 (in Chinese).
Witt, C.A., Dobermann, S., Abdulrachman, S., Gines, H.C., Wang, G.H., 1999. Internal nutrient efficiencies of irrigated lowland rice in tropical and subtropical Asia. Field Crops Res., 63(2):113–138. [doi:10.1016/S0378-4290(99)0031-3]
Xie, Y.H., An, S.Q., Wu, B.F., Wang, W.W., 2006. Density-dependent root morphology and root distribution in the submerged plant Vallisneria natans. Environ. Exp. Bot., 57(1–2):195–200. [doi:10.1016/j.envexpbot.2005.06.001]
Yang, X.E., Liu, J.X., Wang, W.M., Li, H., Luo, A.C., Ye, Z.Q., Yang, Y.A., 2003. Genotypic differences and some associated plant traits in potassium internal use efficiency of lowland rice (Oryza sativa L.). Nutr. Cycl. Agroecosys., 67(3):273–282. [doi:10.1023/B:FRES.0000003665.90952.0c]
Yang, X.E., Wang, W.M., He, Z.L., 2004a. Physiological and Genetic Characteristics of High Nutrient Efficiency of Plants in Acid Soils. In: Wilson, M.J., He, Z.L., Yang, X.E. (Eds.), The Red Soils of China: Their Nature, Management and Utilization, Kluwer Academic Pubilshers, Dordrecht, the Netherlands, p. 78–83.
Yang, X.E., Liu, J.X., WAng, W.M., 2004b. Potassium internal use efficiency relative to growth vigor, potassium distribution, and carbohydrate allocation in rice genotypes. J. Plant Nutr., 27(5):837–852. [doi:10.1081/PLN-120030674]
Yang, X.E., Li, H., Kirk, G.J.D., Dobbermann, A., 2005. Room-induced changes of potassium in the rhizosphere of lowland rice. Commun. Soil Sci. Plant Anal., 36(13):1947–1963. [doi:10.1081/CSS-200062529]
Zhang, G.P., Chen, J.X., Tirore, E.A., 1999. Genotypic variation for potassium uptake and utilization efficiency in wheat. Nutr. Cycl. Agroecosys., 54(1):41–48. [doi:10.1023/A:1009708012381]
Zou, C.Q., Li, Z.S., Li, J.Y., 2001. Study on difference in morphological and physiological characters of wheat varieties to potassium. Plant Nutr. Fert. Sci., 7(1):36–43 (in Chinese).
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Project supported by the Program for Changjiang Scholars and Innovative Research Team in University of China (No. IRT0536) and the National Basic Research Program (973) of China (No. 30740011)
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Jia, Yb., Yang, Xe., Feng, Y. et al. Differential response of root morphology to potassium deficient stress among rice genotypes varying in potassium efficiency. J. Zhejiang Univ. Sci. B 9, 427–434 (2008). https://doi.org/10.1631/jzus.B0710636
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DOI: https://doi.org/10.1631/jzus.B0710636
Key words
- Genotypic difference
- Potassium (K) efficiency
- Root surface area
- Fine root development
- Root cell ultra-structure