Selection of cotton genotypes for yield and fiber quality under water stress

Abstract

The objective of this work was to select a cotton line tolerant to water stress, based on yield and fiber quality characteristics. A total of nine cotton genotypes were evaluated (six breeding lines and three commercial cultivars) in two field experiments conducted in Quixeramobim - CE without water supplementation in 2018 and 2019, respectively. Traits related to cotton lint yield and intrinsic fiber quality were measured. Data were submitted to individual and joint analysis of variance, and selection by the selection index. The genetic variability among the materials demonstrates the possibility of significant gains in the cotton selection process. The genotypes CNPA 2013 - 2235 RF FL, CNPA 2013 - 2064 RF FL and CNPA 2012 - 160 RF FL, as well as the cultivar FM 944 GL, had higher production and better fiber quality under rainfed conditions.

Irrigation Strategies with Controlled Water Deficit in Two Production Cycles of Cotton

“…The reduction of photosynthetic activity caused by water stress can directly affect biomass accumulation in cotton plants. According to Gomes et al [ 35 ], cotton has distinct characteristics, varying according to the genotype, which responds differently to local water conditions.…”

“…The reduction of photosynthetic activity caused by water stress can directly affect biomass accumulation in cotton plants. According to Gomes et al [35], cotton has distinct characteristics, varying according to the genotype, which responds differently to local water conditions. The number of bolls was similar among the three genotypes of colored cotton in the first experiment (Figure 8), and there were decreases of 37.51 and 60.09% caused by irrigation with a water deficit in the vegetative and flowering stages (T 6 -A 2 B 2 C 1 ) in the genotypes 'BRS Jade' and 'BRS Rubi', respectively, compared to plants under full irrigation (100% ETr-T 1 ).…”

Pesquisa e Inovação em Sistemas Agrícolas e Ambientais

“…O algodoeiro (Gossypium hirsutum L.) é uma planta perene, cultivada como cultura anual. As áreas de cultivo de algodão foram restabelecidas no semiárido do Nordeste do Brasil, com base no uso de tecnologias modernas e cultivares de fibra de alta qualidade (GOMES et al, 2022). A cotonicultura da região Nordeste tem se destacado como uma das atividades agrícolas de grande valor para o agronegócio brasileiro, com uma produção de algodão estimada em 1.668,2 mil toneladas distribuídas entre os Estados de Alagoas, Bahia, Paraíba, Ceará, Rio Grande do Norte, Piauí e Maranhão.…”