Phosphorus use efficiency in pima cotton (Gossypium barbadense L.) genotypes

Abstract

In the Brazilian Cerrado, P deficiency restricts cotton production, which requires large amounts of phosphate fertilizer. To improve the yield of cotton crops, genotypes with high P use efficiency must be identified and used. The present study evaluated P uptake and use efficiency of different Gossypium barbadense L. genotypes grown in the Cerrado. The experiment was carried out in a greenhouse with a completely randomized design, 15 × 2 factorial treatment structure (15 genotypes × 2 P levels), and four replicates. The genotypes were MT 69, MT 70, MT 87, MT 91, MT 92, MT 94, MT 101, MT 102, MT 103, MT 105, MT 106, MT 110, MT 112, MT 124, and MT 125; P levels were sufficient (1000 mg pot -1 , PS treatment) or deficient (PD treatment). Dry matter (DM) and P levels were determined in cotton plant parts and used to calculate plant P content and use efficiency. In general, DM and P content were higher in the PS than in the PD treatment, with the exception of root DM and total DM in some genotypes. Genotypes also differed in terms of P uptake and use capacity. In the PS treatment, genotypes MT 92 and MT 102 had the highest response to phosphate fertilization. Genotype MT 69 exhibited the most efficient P uptake in the PD treatment. Genotype MT 124 showed the best shoot physiological efficiency, apparent recovery efficiency, and utilization efficiency, whereas MT 110 exhibited the highest root physiological efficiency.

Phosphorus–zinc interactions in cotton: consequences for biomass production and nutrient‐use efficiency in photosynthesis

“…A, D). This result was expected, as a lower proportion of the nutrient content of tissues is invested in primary biochemistry as tissue nutrient concentrations increase (Veneklaas et al , Santos et al ). By contrast, increasing Zn supply at a given P supply increased PUEP and increasing P supply at a given Zn supply increased ZnUEP (Fig.…”

“…This fragmentary information on P × Zn interactions in plants and the physiological consequences of these interactions warrants further study, particularly in economically important plants known for their high P and Zn requirements. One such plant is cotton ( Gossypium hirsutum L.), for which nutritional imbalances and reduced yields have been reported as a consequence of P × Zn interactions in the soil (Santos et al , Withers et al ). In addition, P‐induced Zn deficiency has been observed for an old cotton cultivar grown hydroponically (Marschner and Cakmak , Cakmak and Marschner ).…”

Mecanismos de interação fósforo-zinco no sistema solo-planta: disponibilidade no solo, avaliações fisiológicas e expressão de transportadores de fosfato

“…Em algumas espécies vegetais, a deficiência por P transforma as raízes em forte dreno de carboidratos (ROSE et al, 2013), estimulando o crescimento radicular e à expansão do comprimento e superfície radicular (LYNCH; BROWN, 2001). O aumento do crescimento de raiz em condições de baixa disponibilidade de P já foi relatado por Zambrosi et al (2012) em citrus e por Santos et al (2015) em algodoeiro. Contudo, a baixa disponibilidade de P induziu efeitos negativos nas relações de trocas gasosas, fotoquímicas, bem como no metabolismo antioxidativo (Figuras 4.4,4.5,4.6 No presente trabalho as plantas deficientes em P exibiram a maior atividade da FA (Figura 4.2G).…”

“…However, little is known about the P-Zn interaction at the rhizosphere level, as well as the availability and distribution of these nutrients at the various adsorption sites of soil reactive particles. Thus, the objective of this work was to describe the availability of P and Zn in rhizosphere soil, in response to P and Zn rates, in two classes of soils cultivated with cotton (Gossypium hirsutum L. A limitação do cultivo do algodoeiro pelo baixo suprimento de P e Zn é comum em condições de cultivo no Brasil, especialmente depois da intensificação e aumento de produtividade da cotonicultura (SANTOS et al, 2015). Destaca-se que a interação desses nutrientes é amplamente discutida na literatura, sendo que o alto teor de P disponível para planta reduz a absorção de Zn (NICHOLS et al, 2012;ZHANG et al, 2012;WATTS-WILLIAMS et al, 2014).…”

“…Entre as culturas agrícolas exigentes em P e Zn para a obtenção de alta produtividade, insere-se o algodoeiro (Gossypium hirsutum L.). A limitação do cultivo do algodoeiro pelo baixo suprimento de P e Zn é comum em condições de cultivo no Brasil, especialmente depois da intensificação e aumento de produtividade da cotonicultura(SANTOS et al, 2015). ,0 L) e iniciando, portanto, os tratamentos.…”