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Original Articles

GENOTYPIC DIFFERENCES IN PHOSPHORUS UPTAKE AND UTILIZATION OF WATERMELON UNDER LOW PHOSPHORUS STRESS

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Pages 312-326 | Received 07 Apr 2011, Accepted 17 Jan 2012, Published online: 17 Jan 2014
 

Abstract

In this study, seven watermelon (Citrullus lanatus) cultivars were tested in solution culture experiment with limiting and ample phosphorus (P) supply to evaluate P uptake and utilization of watermelon under low P stress. Different genotypes showed considerable diversity in terms of biomass accumulation, P uptake, P utilization, root morphological parameters and photosynthetic parameters under low P stress. At low P supply, genotype XN8 and ZCHY were clearly superior to other genotypes in terms of total dry matter yield. The genotype ZJ has the highest P uptake ability, while the genotype XN8 has the highest P efficiency ratio and P utilization efficiency among the seven genotypes under low P stress. The P uptake ability of these genotypes was related significantly and positively to root morphological parameters and photosynthesis parameters under low P stress, the P utilization efficiency showed significant and positive correlation with total dry matter. Results showed existence of genetic differences among watermelon genotypes with regard to P absorption and utilization. The seven genotypes were classified into four groups: efficient responsive (ER), inefficient responsive (IER), efficient non-responsive (ENR) and inefficient nonresponsive (IENR) according to P utilization efficiency under low P stress and dry matter at high P supply. XN8 was identified as ER, and ZCHY was identified as ENR, which may be valuable resources for watermelon production in different soil with low P stress.

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