Coincidence of flowering time and the productivity and quality of cauliflower hybrid seeds

Marcelo Fontanetti Verdial,Antonio Ismael Inácio Cardoso,Márcio Santos De Lima,Francisco Célio Maia Chaves

doi:10.1590/s0103-90162001000300015

Marcelo Fontanetti Verdial, Antonio Ismael Inácio Cardoso + Show 2 more

Open Access

https://doi.org/10.1590/s0103-90162001000300015

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Journal: Scientia Agricola	Publication Date: Sep 1, 2001
Citations: 3	License type: cc-by

Affiliation: Universidade Estadual Paulista (Unesp)

Abstract

The missing of flowering synchronization between the self-incompatible lines in a crop field of cauliflower hybrid seeds besides making the seed production smaller can compromise the genetic purity of them. The coincidence of the flowering time between two cauliflower lines was examined to study its effect on the productivity and quality of hybrid seeds. The treatments consisted of six different sowing dates, every fifteen days, using a self-incompatible tropical line pollinated by a winter line which does not present self-incompatibility. The following characteristics were evaluated: leaf average area and number of flowers per plant, number of siliques per plant, number and weight of seeds per plant, weight of thousand seeds and average number of seeds per silique. The germination standard test and genetic seed purity were determined for each treatment. The coincident flowering season between cauliflower lines affects directly the productivity and the genetic quality of the produced hybrid seeds. The closer the flowering time coincidence between the lines, the greater the number of seeds per silique and the smaller the percentage of non-hybrid seedlings. However, the coincidence of the flowering season between lines was found to influence physiological seed quality.

Highlights

The main mechanism of pollination control in Brassica is the sporophytic type self-compatibility system (Thompson, 1957). This phenomenon occurs when the ovule may not be fertilized by pollen grains of the same plant or another plant which carries the same alleles of incompatibility, causing the absence or drastic reduction of seed number per silique (Bateman, 1954; Watts, 1963; Thompson & Taylor, 1971)
It was demonstrated that homozygotic lines, type S1S1 and S2S2, planted in alternate lines in the field yield only hybrid seeds (Ramalho, 1990)
The present study aims to evaluate the effect of the coincidence of the flowering time between cauliflower lines on the productivity and quality of seeds

Summary

Introduction

The main mechanism of pollination control in Brassica is the sporophytic type self-compatibility system (Thompson, 1957). Genetic purity – Seedling morpholoical evaluation Flowering coincidence between paternal and maternal lines showed a great influence in the genetic quality of seeds. In treatment T3 (TABLE 2), there was no complete flowering coincidence with the paternal line plants.

Results

Conclusion