Abstract
The aim of this work was to characterize the physiological performance and some of the yield attributes of maize seeds in response to periods of temporary flooding. The study was conducted in an experimental design of randomized blocks, with four treatments composed by four replications, being evaluated the germination, the first count of germination, the germination speed index, the thousand seed weight, the number of seeds per ear, the number of rows per ear, the electrical conductivity in seeds, the length of shoot and primary root and the dry matter of shoot and primary root. Thousand seed weight, number of seeds per ear, number of rows per ear and electrical conductivity in seeds were reduced when plants were exposed to a 72 h flooding period. The flooding period of 72 h adversely affects the growth, the physical characteristics and the vigor of maize seeds. Key words: Zea mays L., number of seeds, thousand seed weight, electrical conductivity, initial growth.
Highlights
The study was conducted in an experimental design of randomized blocks, with four treatments composed by four replications, being evaluated the germination, the first count of germination, the germination speed index, the thousand seed weight, the number of seeds per ear, the number of rows per ear, the electrical conductivity in seeds, the length of shoot and primary root and the dry matter of shoot and primary root
Number of seeds per ear, number of rows per ear and electrical conductivity in seeds were reduced when plants were exposed to a 72 h flooding period
There was no significant difference at 5% probability for germination, first counting, germination speed index, root length and root dry matter when evaluating the physiological performance of corn seeds subjected to temporary flooding periods
Summary
It is cultivated in tropical, subtropical and temperate climates. The area cultivated with this species in Brazil in the first 2014/15 the second harvest was 9,587.6 ha. The yield in the main regions with corn cultivation in southern Brazil, under favorable soil and weather conditions, is 12-13 t ha-1 (Conab, 2015). This species responds to the interaction of climatic elements. Soil flooding reduces the diffusion of ethylene and increases its endogenous concentration in plant tissues (Yin et al, 2009), leading to a reduction in leaf area and leaf area
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