Controle genético da exigência térmica para o início do florescimento em milho

Abstract

GENETIC CONTROL OF THE THERMAL DEMAND FOR FLOWERING INITIATION IN MAIZEThe objective of this work was to study the genetic control of thermal demand for maize flowering initiation. Two contrasting lines were crossed and used with the F 1 , F 2 RC 1 and RC 2 derived populations. The trait day-degrees between sown and flowering per plant were evaluated to obtain the estimates of components of variance and means. All models of mean components had R 2 values near 100%, and then the simple additive-dominant model was considered. Considering the components of variance the model with additive, dominant and environment variance explained the genetic control of maize flowering. The results of the estimated components allowed to conclude that genetic control of earlyness in maize is oligogenic with presence of dominance. Moreover, high values of estimate heritability coefficient indicate the possibility of success with individual phenotypic selection.

Mısırda Çiçeklenmenin Gün ve Termal Süreye Göre Genetik Analizi

“…Estimation for the number of effective factors (EF) showed that all of the investigated flowering traits were controlled by few genes (Table 3). This finding is similar to the results of previous studies (Lima et al 2008). Lopes et al (1995) reported that gene number (effective factor) for flowering traits varied from one to nineteen in the different studies.…”

Influence of Air Temperature in the Emission of Nodes, Ramifications and Flowers in Hybrids of Watermelon (Citrullus lanatus)

“…Studies of other cultures prove that the air temperature influences the flower anthesis, both complete or unisexual flowers, such as in Zea mays (Lima et al, 2008) and in Gladiolus × grandiflorus (Streck et al, 2012). The accumulated thermal sum also reported as thermal constant, has been widely used to determine the time necessary to the anthesis of flowers in various vegetables (Volpe et al, 2002).…”

Determinação de altura de plantas de milho através da análise de imagens aéreas obtidas com ARP / Determination of height of corn plants through the analysis of aerial images obtained with ARP

“…O milho (Zea mays L.), originário da América Central, é uma gramínea pertencente à família das Poaceas, e uma das plantas mais eficientes produtoras de energia na natureza, em virtude a sua vasta capacidade de acumular fotoassimilados. É uma planta monoica, isto é, contém órgãos femininos e masculinos separados, no entanto ficam na mesma planta (LIMA, 2006). Amplamente disseminada no território brasileiro, a cultura do milho é de grande importância econômica, social e vasto potencial produtivo.…”