甘蓝型油菜抗倒性评价及抗倒性与株型结构的关系

Evaluation of lodging resistance in rapeseed(Brassica napus L.) and relationship between plant architecture and lodging resistance

以一批抗倒伏和易倒伏的甘蓝型油菜进行田间试验,研究甘蓝型油菜抗倒性评价指标及抗倒性与株型结构关系。结果表明,成熟期田间测定抗拉力可反映品种的抗根倒能力,成熟期根重及根颈粗与品种的抗根倒能力有密切关系。成熟期室内测定的茎秆抗折力矩可反映品种抗茎倒能力,茎重尤其是茎干重/茎秆长也能反映品种茎秆的抗倒能力。株高、茎秆重心高度/株高等形态指标与品种抗倒性有密切关系。株高、分枝点高/株高适中、重心高度/株高较小、分枝数适中、角果分布均匀、株型为紧凑型的品种较抗倒伏,单株生产力也较高,是理想的抗倒株型。

Evaluation of lodging resistance and relationship between plant architecture and lodging resistance in rapeseed was studied using varieties with different lodging performance. The results showed that slanting resistance of the plant measured in the field was a major index for root lodging, root weight and rhizome thickness were also good indexes for root lodging resistant. Stem breaking point could reflect stem lodging resistance. Stem weight and dry matter/stem length can also be used for stem lodging. Plant height and height of gravity center of plant could reflect lodging resistance too. Varieties with moderate plant height, branch point/plant height and number of branches, lower gravity center of plant, compact plant architecture possess high lodging resistance.