Morphological And Physiological Effects Of P - 863 Words

2.2. Morphological and physiological effects of P in plant 2.2.1. Root morphology 2.2.1.1. Root architecture Some plants alter the architecture of their root systems under P stress conditions to optimize P acquisition (Richardson et al., 2011). Due to the relative immobility of P in the soil, with the highest concentrations usually found in the topsoil and little movement of P into the lower soil profiles adaptations that enhance acquisition of P from the topsoil are important (Vance et al., 2003). Under P deficiency, various species from different families develop so-called proteoid roots (Figure 2). These are bottlebrush-like clusters of rootlets of limited growth with an average length of 0.5 to 1 cm. The rootlets are closely arranged along lateral roots and are usually covered with long and dense root hairs (Purnell, 1960; Dinkelaker et al., 1995; Watt and Evans, 1999). The name, proteoid roots, derives from the fact that most species in the family Proteaceae can develop such root clusters when they are grown in infertile soils (Purnell, 1960; Dinkelaker et al., 1995). Figure 2: Proteoid roots produced by white lupin with (A) and without (B) phosphate.: proteoid roots of P-sufficient plants, marked as proteoid (+P); lateral roots of P-sufficient plants, marked as lateral (+P); active proteoid roots of P-deficient plants, marked as proteoid (-P); lateral roots of P-deficient plants, marked as lateral (-P). (Adapted from: Watt and Evans, 1999). One of the mostShow MoreRelatedThe Effect of Radiation in Inducing Mutation on the Growth of Zea Mays1557 Words   |  7 PagesThe Effect of Radiation in Inducing Mutation On the Growth of Zea mays1 Milanie Joy S. Baradi BIO 30 Section S-1L October 10, 2011 ____________________ 1A scientific paper submitted in partial fulfillment of the requirements in Biology 30 laboratory under Professor Neilyn O. 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