Abstract
Plants have adopted a wide range of morphological and physiological mechanisms to cope with P deficiency in soil. Crop species and even cultivars within the species differ genetically in these mechanisms and hence in their response to P deficiency stress. We evaluated growth response and P utilization efficiency of twenty rice cultivars grown in hydroponics with adequate (260 ~M P) as well as deficient (26 ~M P) levels of P. The cultivars differed significantly (p<0.001) in biomass accumulation at both P levels. Phosphorus contents varied significantly (P<0.01) among rice cultivars at both levels of P supply. Positive correlation (p-, 0.01) of shoot dry matter production in rice cultivars with root biomass (r = 0.70, n=160), P uptake (r = 0.82, n=160) and utilization rate (r = 0.46, n=160) indicated that these are the main morphological and physiological parameters for maximizing shoot production in P-starved condition. Greater efficiency in dry matter production per unit amount of P absorbed was obvious in IR 24-PK, 77-74-5-2 and PK 3362-2-1, whereas 33897-11, PK 1818-4-1-7 were least efficient in terms of specific utilization rate of P. Keywords: Genetic variability, P use efficiency, P utilization rate, rice

Tariq Aziz, Pahrnatuttah, M. Aamer Maqsood'. (2005) DIFFERENCES IN PHOSPHORUS ABSORPTION, TRANSPORT AND UTILIZATION BY TWENTY RICE (ORYZA SATIVA L.) CULTIVARS, , Volume 42, Issue 3,4.
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