Pestana R K N, Amorim E P, Ferreira C F, Amorim V B O, Oliveira L S, Ledo C A S, Silva S O
Departamento de Fitotecnia, Universidade Federal de Viçosa, Viçosa, MG, Brasil.
Genet Mol Res. 2011 Oct 25;10(4):3976-86. doi: 10.4238/2011.October.25.2.
Bananas are among the most important fruit crops worldwide, being cultivated in more than 120 countries, mainly by small-scale producers. However, short-stature high-yielding bananas presenting good agronomic characteristics are hard to find. Consequently, wind continues to damage a great number of plantations each year, leading to lodging of plants and bunch loss. Development of new cultivars through conventional genetic breeding methods is hindered by female sterility and the low number of seeds. Mutation induction seems to have great potential for the development of new cultivars. We evaluated genetic dissimilarity among putative 'Preciosa' banana mutants generated by gamma-ray irradiation, using morphoagronomic characteristics and ISSR markers. The genetic distances between the putative 'Preciosa' mutants varied from 0.21 to 0.66, with a cophenetic correlation coefficient of 0.8064. We found good variability after irradiation of 'Preciosa' bananas; this procedure could be useful for banana breeding programs aimed at developing short-stature varieties with good agronomic characteristics.
香蕉是全球最重要的水果作物之一，在120多个国家种植，主要由小规模生产者种植。然而，很难找到具有良好农艺性状的矮化高产香蕉。因此，每年风灾继续破坏大量种植园，导致植株倒伏和果穗损失。传统遗传育种方法由于雌性不育和种子数量少而阻碍了新品种的培育。诱变似乎在新品种培育方面具有巨大潜力。我们利用形态农艺性状和ISSR标记评估了经伽马射线辐照产生的假定“Preciosa”香蕉突变体之间的遗传差异。假定“Preciosa”突变体之间的遗传距离在0.21至0.66之间，协相关系数为0.8064。我们发现辐照“Preciosa”香蕉后有良好的变异性；该方法对于旨在培育具有良好农艺性状的矮化品种的香蕉育种计划可能有用。
