1. Inter-cultivar variations of phosphorus deficiency stress tolerance in hydrponically grown Brassica
- Author
-
Kurimoto Hiroyuki, M.H. Rashid khan, Maqsood A. Gill, Adachi Tadashi, Murata Yoshiyuki, Oki Yoko, and Akhtar M. Shahbaz
- Subjects
Brassica ,P-use efficiency ,growth response ,P content ,P stress factor ,Technology ,Technology (General) ,T1-995 ,Science ,Science (General) ,Q1-390 - Abstract
Phosphorus (P) plays a central role as reactant and effector molecule in plant cell metabolism but P is limiting for crop yield on >30% of the world's arable land. Fear of depletion of world reserves of rock P, consistently increasing prices of phosphate fertilizers coupled with their notoriously low utilization efficiency has made the P-application cost ineffective and unacceptable choice for amelioration of inorganic phosphate (Pi) deficiency. A solution culture experiment was conducted to evaluate ten Brassica cultivars for their relative efficiency to utilize deficiently (20 μM) and adequately (200 μM) supplied P, in Johnson's modified solution. Pi deficiency markedly reduced shoot dry matter (SDM), root dry matter (RDM) production. Control of whole plant dry matter by plant P content under P deficient conditions suggests an internal regulation in addition to the influence exerted by external P supply. There were large differences of plant growth among Brassica cultivars exposed to the same P concentration in the growth medium. The cultivars differed significantly (p
- Published
- 2006