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首页> 外文期刊>Experimental agriculture >Breeding new cotton varieties to fit the diversity of cropping conditions in Africa: effect of plant architecture, earliness and effective flowering time on late-planted cotton productivity.
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Breeding new cotton varieties to fit the diversity of cropping conditions in Africa: effect of plant architecture, earliness and effective flowering time on late-planted cotton productivity.

机译：育种新的棉花品种以适应非洲不同的种植条件：植物结构，早熟和有效开花时间对后期种植棉花生产力的影响。

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摘要

In most cotton-growing regions of West and Central Africa where rainfed conditions prevail, cropping conditions are highly diversified since the crop is planted over an extended period. We studied production and development patterns in 10 cotton (Gossypium hirsutum) varieties to determine the most efficient strategies that could be transformed into breeding traits. Four trials were carried out between 2002 and 2003 in two cotton-growing areas in Benin to compare the 10 varieties at three stand densities and two planting dates. The parameters monitored were the mean first flower opening date (FF), effective flowering time (EFT), plant height at harvest (HH), height to node ratio (HNR), length of fruiting branch (LFB), number of vegetative branches (NVB) and average boll retention at the first position of the fruiting branches (RP1). We identified two ideotypes that yielded better than the others: (i) Mar 88-214 performed well under late planting-high stand density conditions and was characterized by low vegetative growth and early flowering onset, a short flowering period and low RP1; (ii) H 279-1 performed especially well under early planting-low stand density conditions and was characterized by high vegetative growth, late flowering, long EFT and high RP1. We propose a breeding strategy for both ideotypes based on seven indicators with high heritability (FF, HH, HNR, and LFB) or medium heritability (NVB, EFT, and RP1).
机译：在西非和中非的大多数棉花种植地区，雨水条件普遍存在，由于作物的播种期较长，因此作物的种植条件高度多样化。我们研究了10个棉花（陆地棉）品种的生产和发展模式，以确定可以转化为育种性状的最有效策略。 2002年至2003年之间，在贝宁的两个棉花种植​​区进行了四次试验，以比较三种密度和两个播种日期的10个品种。监测的参数为平均第一朵开花日期（FF），有效开花时间（EFT），收获时的植物高度（HH），株高比（HNR），子实体的长度（LFB），植物的营养枝数（ NVB）和平均结实率在结实分支的第一位置（RP1）。我们确定了两种比其他类型表现更好的表型：（i）Mar 88-214在播种后期，高林分密度条件下表现良好，其特征是营养生长低，花期早，花期短和RP1低。 （ii）H 279-1在早期种植，低林分密度条件下表现特别出色，其特征是高营养生长，开花后期，长EFT和高RP1。我们基于七个具有高遗传力（FF，HH，HNR和LFB）或中等遗传力（NVB，EFT和RP1）的指标，为两种表型提出育种策略。

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