Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2008.30.36Camellia sinensis L.) Plants]]>SalehiS.Y. HajibolandR. 1200871This study was conducted to investigate the effect of
extremely low level of P supply in the nutrient solution on growth, P
uptake and utilization as well as gas exchange and chlorophyll fluorescence
parameters in five different tea (Camellia sinensis L.) seed stocks.
Plants did not show any visual leaf symptoms during 90 days growth in
the medium without P. The five tested seed stocks did not differ in response
to low P. The optimum P supply was 50 μM, plants grown at 100 μM
P showed significant growth inhibition up to 21-65% (p≤0.05). One of
the main causes of growth inhibition was reduction of net photosynthesis
rate firstly due to lower stomatal conductance and secondly as the consequence
of inhibition of photochemistry of P deficient tea leaves. Phosphorus
concentration of leaves and roots in severely deficient plants was 0.7-0.9
mg g-1 DW. Very low P concentration in combination with low
growth inhibition demonstrated a high internal use efficiency in tea plants.
Internal P use efficiency was increased up to 3.65 times in response to
low P supply. Phosphorus deficiency did not cause higher surface area
of roots, moreover, P deficient plants had a reduction of uptake rate
up to 94%. Results suggested that, P deficient tea plants did not develop
any strategy for higher P uptake from medium, neither in terms of changes
in root architecture nor induction of high affinity P uptake systems.
In contrast, an extremely high tolerance of tea plants to P deficiency
is mainly due to high internal use efficiency.]]>Alves, V.M.C., S.N. Parentoni, C.A. Vasconecellos, A.F.C.B. Filho and G.V.E. Pitta et al.,20012001pp: 566-567pp: 566-567Chiera, J., J. Thomas and T. Rufty,200253473481Dalluge, J.J. and B.C. Nelson,2000881411424Ghanati, F., A. Morita and H. Yokota,2005276133141Innocenti, E.D., C. Vaccà, L. Guidi and G.F. Soldatini,200341485493Jaiswal, P.C.,20042004Jiang, Q., D. Roche, A.T. Monaco and S. Durham,200696269278Kochian, L.V., O.A. Hoekenga and M.A. Pineros,200455459493Lambers, H., M.W. Shane, M.D. Cramer, S.J. Pearse and E.J. Veneklaas,200698693713Luczaj, W. and E. Skrzydlewska,200540910918Malakoti, M.J. and S. Sadagat,19991999Marschner, M.,19952nd Edn.,pp: 200-255pp: 200-255Mielke, M.S., A.A.F. Almeid, F.P. Gomes, M.A.G. Aguilar and P.A.O. Mangaberia,2003Genipa americana seedlings to soil flooding.]]>50221231Mollier, A. and S. Pellerin,199950487497Neumann, G. and V. Romheld,1999211121130Nielsen, K.L., A. Eshel and J.P. Lynch,2001Phaseolus vulgaris L.) genotypes.]]>52329339Page, A.L.,19821982Dos Santos, M.G., R.V. Ribeiro, R.F. de Oliveira, E.C. Machado and C. Pimentel,2006170659664Shenoy, V.V. and G.M. Kalagudi,200523501513Smith, F.W.,2002245105114Tennant, D.,1975639951001Zoysa, A.K.N., P. Loganathan and M.J. Hedley,1999Camellia sinensis L.) clones.]]>53189201Vance, C.P., C. Uhde-Stone and D.L. Allan,2003157423447